IFLUKEI
instruction manual 
NOTE 
This manual 40cuments the Model 8020A and Its assemblies al the .. vision Iev.eI$ .w.own In Appendix A. If your Instrumenl contains assemb .... _dlfleftml revision lette .... II wUI be necessary for ~ to either update or backdate this manual. Reier to the supplententafchange/erfala sheet forriewer assemblies, or to·lhe backdating sheet In Appendix A for older assembtles. 
8020A 
Digital Multhneter 
PIN 515825 
April 1979 
For the benefit and convenience of its customers, Fluke Corporation (Fluke) has reproduced this copy of a manual which Is no longer In production. This manual has not been edited or updated since the revision date shown on the lower left hand comer of the first page. Fluke will not be liable for any claims, losses or damages of any kind incurred by any user arising from use of this manual. 

Dear Customer: 
Congratulations! We at Fluke are proud to present you with the Model 8020A Multimeter. This instrument represents the very latest in integrated circuit and display technology. As a result, the end product is a rugged and reliable instrument whose performance and design exhibit the qualities of a finely engineered lab instrument. 
To fully appreciate and protect your imiestment; we suggest that you take a few moments to read the manual. As always, Flukestandsbehindyour8020A with a full2-year warranty anda worldwide service organization. If the need arises, please don't hesitate to call on us. 
Thank you for your trust and confidence. 
JOHN FLUKE MFG. CO;, INC. 

8020A 
Table of Contents 
SECTION 
TITLE 
PAGE 
	1 	INTRODUCTION AND SPECIFICATIONS 	1-1 
		I-I. 	INTRODUCTION 	I-I 
		1-3. 	PREPARING FOR OPERATION 	1-2 
		1-4. 	Unpacking ....•.................................. 1-2 
		1-7. 	Battery Installation; Replacement 	1-2 
		1-9. 	PHYSICAL FEATURES 	1-4 
		I-II. INITIAL CHECK-OUT PROCEDURE 	1-4 
		1-13. ACCESSORIES 		1-6 
		1-15. SPECIFICATIONS 	_ 	1-6 
	2 			OPERATING INSTRUCTIONS 		2-1 
				2-1. 	INTRODUCTION 		2-1 
				2-3. 	INPUT POWER 		2-1 
				2-4. 	Battery Life .......................•.............. 2-1 
				2~. 	Line Power Operation 	2-1 
				2-8. 	OPERATING NOTES 	2-2 
				2-10. 	Input Overload Protection .....•....•...........•.. 2-2 
				2-12. 	Input Connections to COMMON 	2-3 
				2-14. 	Fuse Replacement ..............•..............•.. 2-3 
				2-16. 	The Display ........•............•................ 2-3 
				2-20. OPERATION 	2-4 
				2-22. MEASUREMENT TECHNIQUES 	2-5 
				2-24. 	AC Measurement 	2-5 
				2-26. 	Voltage AC/DC 	2-5 
				2-29. 	Current AC/ DC 	2-5 
				2-33. 	Resistance •...................................... 2-9 
				2-37. 	Conductance ...............................•..... 2-10 
				2-41. APPLICATIONS 	2-10 
				2-43. 	Transistor Tester 	2-10 
				2-48. 	Leakage Tester 	2-13 
3 		THEORY OF OPERATION 	3-1 3-1. INTRODUCTlON ..............••.................. 3-1 
	3-3. OVERALL FUNCTIONAL DESCRIPTION 	3-1 
	3-8. BLOCK DIAGRAM ANALYSIS 	3-3 
(continued on page ii) 

TABLE OF CONTENTS, continued 
SECTION 	TITLE 
PAGE 
8020A 
	3-9. 	A/ D Converter 	3-3 
	3-18. 	Input Signal Conditioners 	3~ 
4 	MAINTENANCE 	4-1 
	4-1. 	INTRODUCTION 	4-1 
	4-3. 	SERVICE INFORMATION 	4-1 
	4-7. 	GENERAL INFORMATION 	4-2 
	4-8. 	Access Information 	4-2 
	4-17. 	Cleaning 	····· 4-5 
	4-19. 	Battery/Fuse Replacement .•....................... 4-5 
	4-21. PERFORMANCE TEST 	4-5 
	4-23. 	Initial Procedure 	4-5 
	4-25. 	Display Test 	4-6 
	4-27. 	Resistance/Conductance Test 	4-6 
	4-29. 	DC Voltage Test 	4-7 
	4-31. 	AC Voltage Test 	· .. 4-7 
	4-33. 	DC Current Test 	4-8 
	4-35. CALIBRATION 	4-9 
	4-38. TROUBLESHOOTING 	4-10 
5 	LIST OF REPLACEABLE PARTS 	5-1 
	5-1. 	INTRODUCTION 	5-1 
	5-4. 	HOW TO OBTAIN PARTS 	5-2 
6 	OPTIONS AND ACCESSORIES 	6-1 
	6-1. 	INTRODUCTlON 	6-1 
	6-3. 	DELUXE CARRYING CASE 	6-1 
	6-5. 	TEMPERATURE PROBE (80T-150) 	6-1 
	6-6. 	Introduction 	6-1 
	6-8. 	Specifications.. .. . .. .. .. .. .. . .. .. .. .. .. . .. . . .. 	6-1 
	6-9. 	CURRENT TRANSFORMER (801-600) 	6-4 
	6-10. 	Introduction 	6-4 
	6-12. 	Specifications 	6-4 
	6-13. HIGH VOLTAGE PROBE (80K-40) 	6-4 
	6-14. 	Introduction 	6-4 
	6-16. 	Specifications 	6-4 
	6-17. HIGH FREQUENCY PROBE (8IRF) 	6-4 
	6-18. 	Introduction 	6-4 
	6-20. 	Specifications 	6-5 
	6-21. HIGH FREQUENCY PROBE (82RF) 	6-5 
	6-22. 	Introduction 	6-5 
	6-25. 	Specifications 	6-5 
	6-26. BATTERY ELIMINATOR (A8!) 	6-5 
	6-28. CURRENT SHUNT (80J-IO) 	6-6 
	6-29. 	Introduction 	6-6 
	6-31. 	Specifications 	6-6 
7 	SCHEMATIC DIAGRAMS 	·· 7-1 
	APPENDIX A 	A-1 
ii 

TABLE 
I-I. 1-2. 1-3. 2-1. 2-2. 4-1. 4-2. 4-3. 4-4. 4-5. ~. 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. 6-1. 
8020A 
List of Tables 
TITLE 
Controls, Indicators and Connectors 	. 
8020A Accessories ................••...................... Specifications .........................................•.. 
Input Overload Limits ...........•..•................•..... Voltage/Current Capability of Resistance Ranges •............ List of Recommended Test Equipment ........•............. 
Resistance! Conductance Checks 	. 
DC Voltage Checks ..........•............................ AC Voltage Checks •.......•.................•............ DC Current Checks ................................••..... 
Troubleshooting Guide 	. 
8020A Final Assembly 	.. 
A2 Case Assembly ......•....•.....................••..... 
A I 8020A PCB Assembly 	. 
Federal Supply Codes for Manufacturers .......•............ Fluke Technical Service Centers .................•.......... 
Sales and Service Locations (International) 	. 
A81 Model Numbers for Various Input Power Configurations .. 
iii 
PAGE 
1-8 1-10 1-10 2-2 2-9 4-2 a-s 4-7 4-8 4-9 4-10 5-3 5-4 5-6 5-10 5-10 5-10 6-6 

8020A 
List of Illustrations 
FIGURE 
TITLE 
I-I. 	Removing the Battery Cover 	1-3 
1-2. 	Battery Clip and Fuse Holder 	1-4 
1-3. 	Controls, Indicators and Connectors 	1-7 
2-1. 	Selecting Function and Range .........•.................... 2-4 
2-2. 	Waveform Conversion 	2-6 
2-3. 	Voltage Measurement Error Calculations 	2-1 
2-4. 	Current Measurement Error Calculations 	2-8 
2-5. 	Conductance-to-Resistance Conversion 	2-11 
2-6. 	Transistor Beta Tester 	2-12 
3-1. 	8020A Simplified Block Diagram 	3-2 
3-2. 	Dual Slope AID Converter 	3-4 
3-3. 	Input Signal Conditioners 	3-7 
4-1. 	Calibration Adjustment Locations ............•............. 4-3 
5-1. 	8020A Final Assembly 	5-5 
5-2. 	8020A PCB Assembly 	5-9 
6-1. 	Model 8020A Accessories 	6-2 

PAGE 

8020A 
Section 1 Introduction & Specifications 
1-1. INTRODUCTION 
1-2. Your John Fluke Model 8020A is a pocket-sized digital multimeter that is ideally suited for application in the field. lab, shop or home. Some of the features of your instrument are: 
All YOM functions plus the versatile conductance function (six in all) are included as standard. 
DC Voltage - 100 µV to 1000V 
AC Voltage- 100 µV to 750V 
DC Current - I µA to 2000 mA 
AC Current - I µA to 2000 mA 
Resistance - O.lil - 20 Mil 
Conductance - 0.1 nS to 200 nS and .001 mS to 2 mS (S = siemens== I/il). 
CONDUCTANCE - A new multimeter function that allows fast, accurate, noise free resistance measurements up to 10,000 Mil. 
3 1{2 digit liquid crystal display, a high contrast display that can be read easily from across the room. No more worries about bent needles, parallax, etc. 
• Each range has: 
Full auto-polarity operation. 
Overrange indication. 
Effective protection for overloads up to IOOOV dc and transients up to 6000V peak. 
• Dual slope integration measurement technique to insure noise-free measurements. 
• Long term calibration stability - I year. Easy calibration - few adjustments. 
• Lightweight - 369 grams (13 ounces). 
1-1 

Up to 200 hours of continuous operation can be expected from a single, inexpensive, 9V, alkaline battery (transistor radio/calculator type). 

8020A 
• Low battery voltage automatically detected and displayed. 
Line operation is possible using a Model A81 Battery Eliminator (see Section 6, Accessories) . 
Protected test leads - finger guards on the probes and shrouded contacts on the connectors discourage accidental contact with circuit voltages. 
• A full line of accessories that extend the range and scope of your instrument. 
1-3. PREPARING FOR OPERATION 
1-4. Unpacking 
1-5. Your 8020A was packed and shipped in a container especially designed to protect your DMM. This manual, your multimeter, one 9V battery, and two test leads (one red and one black) should be packed in the shipping container. Check your shipment thoroughly. If anything is wrong with your shipment, contact the place of purchase immediately. If satisfaction is not obtained, contact the nearest John Fluke Service Center. A list of these service centers is located at the rear of this manual. 
t-6. If reshipment is necessary, please use the original shipping container. If the original . container is not available, a new one can be obtained from the John Fluke Mfg. Co., Inc. Please state the instrument model number when requesting a new shipping container. 
1-7. Battery Installation/Replacement 
1"8. Your 8020A is designed to operate on a single, inexpensive, 9V battery of the transistor radio/calculator variety (NEDA 1604). When you receive your 8020A,the battery will not be installed in the DMM. Once the battery is installed. you can expect a typical operating life of up to 200 hours with an alkaline battery or 100 hours with a carbon-zinc battery. When the battery has exhausted about 80% of its useful life. the BT indicator will appear in the upper left corner of the display. Your 8020A will operate properly for at least 20 hours after BT appears. Use the following procedure to install or replace the battery. 
WARNING 
BATTERY REPLACEMENT SHOULD ONLY BE PERFORMED AFTER THE INPUT SIGNAL AND TEST LEADS HAVE BEEN REMOVED FROM THE INPUT TERMINALS, AND THE POWER SWITCH IS SET TO OFF. 
I. Set the 8020A power switch to OFF. 
1-2 

8020A 
2. Remove test leads from external circuit connections and from the 8020A input terminals. 
3. Open the battery compartment on the bottom of the 8020A using the method shown in Figure I-I. 
4. Extend the battery by sliding it toward the connector end until it can be tilted out. 
5. Carefully pull the battery clip free from the battery terminals as shown in Figure 1-2. 
6. Press the battery clip onto the replacement battery and return both to the battery compartment. 
7. Make sure the battery and its leads are fully within the confines of the battery compartment before sliding the cover into place. 
WARNING 
DC)NC)T· Of:'ERATE THE8020A UNTIL THE BATTERY COVER IS IN PLACE AND FULLY. CLOSED. 

BACK SIDE OF 8020A 
Figure 1-1. Removing the Battery Cover 
1-3 

8020A 

Figure 1-2. BaHery Clip and Fuse Holder 
1-9. PHYSICAL FEATURES 
1-10. Before you try to use your 8020A, we suggest that you take a few minutes to get acquainted with your instrument. All of the externally accessible physical features of your 8020A are shown in Figure 1-3 and described in Table I-I. Locate each feature on your 8020A as you read the description. 
1-11. Initial Check-Out Procedure 
1-12. Now that you have installed the battery, and know where everything is, let's make sure the unit is working properly. We'll run through a simple check-out procedure, starting with turn-on. No equipment other than the test leads .will be required. If a problem is encountered, please recheck the battery, fuse, switch settings, and test lead connections before contacting your nearest authorized John Fluke Service Center. 
NOTE 
This procedure is intended to verify overall instrument operation. and is not meant as a substitutefor the formal Performance Test given in Section 4. limits shown exceed the specifications because the procedure uses one measurement 10 check another. 
I. Set the power switch to 0 FF and all range and function switches to the released (out) position. 
2. Set the power switch to ON and observe the display. It should read 00.0 ±0.1. 
3. Connect the red test lead to the V Ikn input terminal. 
1-4 

8020A 
4. Touch the red probe tip to the COMMON input terminal, and sequentially depress each of the six grey range switches starting at the top (20 Mn). The display should read zero ±I digit and the decimal point should be positioned as follows: 
20 Mn - 0.00 	d. 20 kn - 0.00 
2000 kn - 000 	e. 2 kn - .000 
200 kn - 00.0 	f. 200n - 00.0 
5. Press the 20V range switch and remove the probe from the COMMON input terminal. 
6. Look inside of the battery eliminator connector on the right side of the 8020A and locate the connector contacts (center post and side contact as shown in Figure I-I). 
7. Touch the red probe tip to the center post of the battery eliminator connector. The display should read approximately -6.1 V de, 
8. Touch the probe tip to the side contact of the battery eliminator connector. The display should read approximately 2. 9V dc. Notice that the sum of the two readings is equal to the battery voltage (typically 8 to IOV de), Remove the probe from the battery jack. 
9. Depress the lower white button (kn) and sequentially depress each of the six range switches. The display should read I as the most significant digit with no other numbers shown. This is the standard overrange indication. Notice that the decimal point changes position with the range switch settings just as it did in step 4 of this procedure. 
10. Touch the red probe tip to the COMMON input terminal, and sequentially press each of the grey buttons. The display should read zero at each range setting. Lead resistance may be sufficient to cause a one or two tenths (0.1 or 0.2n) indication on the 2000 range. 
II. Touch the red probe tip to the mA input connector and press the 200n switch. The display should read 99.0 to 101.0. 
12. Press the 2kOswitch. The display should read .099 to .101. Remove the probe from the mA input connector. 
13. Simultaneously depress the 2000 kn and the 20 Mf) range switches. This selects the 200 nS range. The display should read 00.0 to 01.0 (minimum conductance. maximum resistance). 
14. Touch the red probe tip to the COMMON input connector. An overrange indication should be displayed since conductance is the reciprocal of resistance. 
15. Connect the black test lead to the COMMON input connector. 
16. Depress both ACf DC switch and the 750V ac range switch. Set the mAl V -kn switch to the voltage (out) position. 
1-5 

WARNING 
THE LOCAL LINE VOLTAGE IS MEASURED IN THE FOLLOWING STEP. BE CAREFUL NOT TO TOUCH THE PROBE TIPS WITH FINGERS, OR TO ALLOW THE PROBE TIPS TO CONTACT EACH OTHER. 
8020A 
17. Measure the local ac line voltage at a convenient output receptacle. The voltage should be displayed with I volt resolution. 
18. If the 8020A has responded properly to this point, it is operational and ready for use. 
1-13. ACCESSORIES 
1-14. Table 1-2 lists the accessories available for use with the Mode18020A. Detailed information about each accessory is provided in Section 6. 
2 
J 
4 
1-15. SPECIFICATIONS 
1-16. Table 1-3 lists the 8020A specifications. These specifications assume a l-year calibration cycle and an operating temperature of 18° C to 28° C (640 F to 820 F) at relative humidity up to 90% unless otherwise noted. 

Figure 1-3. Controls, Indicators and Connectors 
1-6 

ITEM NO. 
2 
3 
4 
5 
6 
7 
8 
8020A 
NAME 
Table 1-1. 8020A Controls, Indicators and Connectors 
FUNCTION 
Display 
Power Switch 
Tilt Bail 
Battery Eliminator and Connector 
Battery Compartment and Cover 
V/kQ Input Connector 
COMMON Input Connector 
mA Input Connector 
A 3 1/2 digit display (1999 max) with decimal point and minus polarity indication. Used to indicate measured input values, overrange condition and low battery condition. 
A slide switch used to turn the instrument off and on. 
A removable fold-out stand which allows the instrument to be either tilted for bench-top applications or hung from a hook in the absence of a work surface. 
An external input power connector for use with the Model A81 Battery Eliminator accessory. (A81 is available in a variety of voltage and plug configurations. See Section 6.) 
Cover for the 9V battery and the current-protection fuse. The cover is removed by pushing it away from the case screw. 
Protected test lead connector used as the high inputfor all voltage, resistance and conductance measurements. Will accept banana plugs. 
Protected test lead used as the low or common input for all measurements. Will accept banana plugs. 
Protected test lead connector used as the high input for all current measurements. Will accept banana plugs. 
1-7 

8020A 
Table 1-1. 8020A Controls, Indicators and Connectors (cont) 
FUNCTION 

ITEM NO. 
9 
10 
11 
1-8 
NAME 
mAlV-kO/nS Switch 
Range Switches 
DCIAC Switch 
A push-push switch (push on - push off, do not pull to select function) which operates in conjunction with the high input connectors to select either the mA/V or kO (conductance) measurement functions. When in or depressed it selects kO. The out position selects rnA or V depending upon the location of the high input lead. 
Interlocked push-button switches for selecting ranges, i.e., pressing the desired range switch selects that range and cancels previous switch depressions. Do not pull switches to select a range. 
Voltage: 	200 mV, 2v, 20V, 200V, 1000V dc/750V ac 
Current: 	2 rnA, 20 rnA, 200 mA, 2000 mA 
Resistance: 	2000, 2 kO, 20 kO, 200 kO, 2000 kO, 20 MO 
Conductance: 	200 nS or 2 mS (S = siemens = 110 = international unit of conductance). Requires simultaneous depression of two range switches. 
A push-push switch (push on - push off, do not pull to select function) used to select the ac or dc measurement function when measuring current or voltage. When in, or depressed, the ac function is selected. Out selects dc. Switch may be in either position when making resistance or conductance measurements 

8020A 
Table 1-2. 8020A Accessories 
ACCESSORY 	DESCRIPTION 	
Cgo 	Deluxe Carrying Case 	
8OT-150 	Temperature Probe 	
801-600 	Current Transformer 	
8OK-40 	High Voltage Probe 	
81RF 	High Frequency Probe 	
82RF 	High Frequency Probe 	
80J-10 	Current Shunt 	
A81 	Battery Eliminator 	
Table 1-3. 8020A Specifications 
The following specifications assume a t-year calibration cycle and an operating temperature of 18°C to 28°C (64°F to 82°F) at relative humidity up to 90% unless otherwise noted. 
FUNCTIONS: DC Volts, AC Volts, DC Current, AC Current, Resistance, and Conductance. 
DC VOLTS: 
RANGE 	RESOLUTION 	ACCURACY FOR 1 Year 		
±2oomV 	100µV 		I 	
±2V 	1 mV 			
±20V 	10mV 	±(O.1% of reading +1 digit) 		
±200V 	100 mV 			
±1000V 	1V 			
Overvoltage Protection: 1000V dc or peak ac on all ranges. Input Impedance: 10MO, all ranges. 
Normal Mode Rejection Ratio: > 60 dB at 50 Hz and 60 Hz. 
Common Mode Rejection Ratio (1 kO unbalance): > 100 d!3 at de, 50 Hz and 60 Hz. 
1-9 

8020A 
Table 1-3. 8020A Specifications (cont) 
AC VOLTS (Average Sensing. RMS Calibrated Sinewave): 
				ACCURACY 		
RANGE 	RESOLUTION 					
		45Hzto1 kHz 	1kHzto2kHz 	2kHz to 5kHz 		
200 mV 	100µV 					
2V 	1 mV 	±(0.75% 	±(1.5% of 	±(5% of 		
		of reading 	reading +3 	reading 		
20V 	10 mV 	+2 digits) 	digits) 	+5 digits) 		
200V 	0.1V 					
750V 	1V 	±(1% of 	Not 	Not 		
		reading +2 	specified 	specified 		
		digits) 				
		- 	-- 			
Overload Protection: 750V rms or 1000V peak continuous, not to exceed the volt-hertz product of 107 except 200 mV ac ranges (15 seconds maximum above 300V rms). 
Common Mode Noise Rejection Ratio (1 kD unbalance): > 60 dB at 50 Hz and 60 Hz. 
Volt-Hz Product: 107 max (200V amx 50 kHz). Input Impedance: 10 Mel in parallel with <100 pF. 
DC CURRENT: 
RANGE 	RESOLUTION 	ACCURACY 	BURDEN 	
		for 1 Year 	VOLTAGE 	
2mA 	1 µA 			
20mA 	10µA 	±(0.75% of reading 	0.25V max. 	
200mA 	100µA 	+1 digit) 		
				
2000 mA 	1 mA 		0.7V max. 	
Overload Protection: 2A/250V fuse. 
1-10 

8020A 
Table 1-3. B020A Specifications (contI 
AC CURRENT: 
		ACCURACY for 1 Year 			
		45 Hz to 	450 Hz to 	BURDEN 	
RANGE 	RESOLUTION 			VOLTAGE 	
		450 Hz 	1 kHz 		
		±(2%of 	Not 		
2mA 	1 µA 	reading 	specified 		
		+2 digits) 		0.2SV rms max. 	
20 rnA 	10µA 	±(1.S% of reading 			
200 mA 	100µA 	+2 digits) 			
2000 rnA 	1 rnA 			0.7V rms max. 	
Overload Protection: 2A/2S0V fuse. 
RESISTANCE: 
		ACCURACY 	FULL-SCALE 	MAXIMUM 	
RANGE 	RESOLUTION 	for 1 Year 	VOLTAGE 	TEST 	
				CURRENT 	
2000 	0.10 	±(0.2% of 	<0.2SV 	.3SmA 	
		reading +3 digits) 			
2kO ..... 	10 		>1.0V 	1.1 mA 	
20 kO 	100 	±(0.1% of 	<0.2SV 	13µA 	
200 kO..,. 	1000 	reading +1 digit) 	>0.7V 	13µA 	
2000 kO 	1 kO 		<0.2SV 	0.13µA 	
20 MO-+l- 	10 kO 	±(2% of reading 	>.7V 	0.13µA 	
		+1 digit) 			
Overload Protection: SOOV dc/ac rms on all ranges. 
Open Circuit Voltage: Less than 1.SV on all ranges except 2 kO range is less than 3.SV. 
Diode Test: These three ranges have enough open circuit voltage to turn silicon junctions on, to check for proper forward-to-back resistance. The 2 kO range is preferred and is marked with the larger diode symbol. The three non-diode test ranges will not turn on silicon junctions so in-circuit resistance measurements can be made with these ranges. 
1-11 

8020A 
Table 1-3. 8020A Specifications (conti 
CONDUCTANCE: 
RANGE 	ACCURACY 	
2 mS 	±(0.2% of reading +1 digit) 	
200 nS 	±(2.0% of reading +10 digits) 	
Overload Protection: SOOV dc/rms on all ranges. Open-Circuit Voltage: 
2 mS <3.SV 
200 nS <1.SV 
Diode Test: Both ranges will forward bias a typical PN junction. 
ENVIRONMENTAL: 
Temperature: 0° e to SOO e (32° F to 122° F) operating. -3Soe to +600e (-31°F to 140°F) storage. 
Relative Humidity: 0 to 80%, 0° e to 3So e (32-9S0 F) on 2 MO, 20 MO and 200 nS ranges. 
to 90%, ooe to 3Soe (32-9S0F) on all other ranges. 
to 70%, ss-e to 50°C (9S-122°F). 
Temperature Coefficient: <0.1 times the applicable accuracy specification per "C for ooe to 18°C and 28°C to sooe (32°F to 64.4°F and 50.4°F to 122°F). 
GENERAL: 
Maximum Common Mode Voltage: 500V dc/rms ac. Power Requirements: Single 9V battery, NEDA 1604. 
Battery Life: Alkaline: 200 hours typical. 
Zinc carbon: 100 hours typical. 
Battery Indicator: "ST" in display illuminates when approximately 20% of battery life remains. 
Display: 3 1/2 digit LCD (2,000 count), autozero, autopolarity. Size: Lx W x H: 18.0 cm x 8.6 cm x 4.5 cm. 
(7.1 in x 3.4 in x 1.8 in) 
Weight: 0.37 kg (13 oz) 
1-12 

S020A 
Section 2 
Operating Instructions 
2-1. INTRODUCTION 
2-2. To fully utilize the measurement capabilities of your 8020A, a basic understanding of its measurement techniques and limitations is required. This section of the manual provides that information, plus a few applications that may prove useful. For example, did you know your 8020A will provide direct-reading dc curren t gain (Beta) measurements for both NPN and PN P transistors? Read this section of the manual. to find out how it's done, 
2-3. INPUT POWER 
2-4. Battery Life 
2-5. The 8020A is designed to operate on a single, inexpensive 9 V battery of the transistor radio! calulator variety (NEDA 1604). If an alkaline battery is used, a typical operating life of up to 200 hours can be expected. Carbon-zinc batteries will have a useful life of up to 100 hours. In either event, the 8020A will display a BT (in upper, left-hand corner) when the battery has exhausted approximately SO% of its useful life. When BT first appears. the battery is capable of properly operating the 8020A for at least another 20 hours, 
NOTE 
To ensure operation within the accuracy specifications. the battery should he replaced when the voltage measured at the center of the battery eliminator connectorfalls he/ow -3.00 I'O/IS (with respect to the COMMON if/put). 
2-6. Line Power Operation 
2-7. You can operate your S020A off line power by using the ASI Battery Eliminator Accessory. Refer to Section 6 for additional information about the AS!. 
2-1 

S020A 
CAUTION 
2-S. OPERATING NOTES 
2-9. The following paragraphs should familiarize you with the capabilities and limitations of your Model 8020A and instruct you in routine operator maintenance. 
2-10. Input Overload Protection 
Exceeding the maximum input overload limits can damage the Model S020A. 
2-11. Each measurement function and its associated ranges are equipped with input overload protection. The overload limits for each function and range are given in Table 2-1. 
Table 2-1. Input Overload Limits 
SELECTED 	SELECTED 	INPUT 	MAX. INPUT 	
FUNCTION 	RANGE 	CONNECTIONS 	OVERLOAD 	
V dc or 	200 mY, 2V, 	V/kO and 	1000V dc or peak 	
Vac 	20V, 200V, 	COMMON 	ac on dc ranges. 	
	750Vac, 		1OO0V dc or 750V 	
	1000V de 		rms on ac range-15 	
			seconds max. on 	
			200 mV ac range. 	
mA dc or 	2 mA, 20 mA, 	mA and 	2A max. Fuse 	
mA ac 	200 mA, 	COMMON 	protected in circuits 	
	2000mA 		with open circuit 	
			voltage ~250V 	
			dc/rms ac. 	
			Do not use 	
			above 250V. 	
0, kO, MO, 	2000, 2 kO, 20 	V/kO and 	500V dc or rms ac. 	
S (1/0) 	kO, 200 «o, 	COMMON 		
	2000 «o, 20 MO, 			
	200 nS, 2 mS 			
			500V de/rms ac 	
ANY 	ANY 	COMMON 	with respect to 	
			earth ground. 	
'-- 	-- - 			
2-2 

S020A 
2-12. Input Connections to COMMON 
WARNING 
TO AVOID ELECTRICAL SHOCK ANDIOR INSTRUMENT DAMAGE DO NOT CONNECT THE COMMON INPUT TERMINAL TO ANY SOURCE OF MORE THAN 500 VOLTS DC OR RMS AC ABOVE EARTH GROUND. 
2-13. The ~020A may be operated with the COMMON input terminal at a potential of up to 500V de or 500V rms ac above earth ground. If this limit is exceeded, instrument damage may occur. This, in turn, may result in a safety hazard for the operator. 
2-14. Fuse Replacement 
2-15. All ranges of the ac and dccurrent measurement functions of your S020A are fuse protected from inadvertent application of current in excess of 2 amps. The fuse is located on the back of the battery clip. Use the Battery Installation/ Replacement procedure (presented earlier-in this section) to gain access to the fuse. Replace the defective fuse with type AGX2. (Instruments that accomodate metric fuses use type 171100-2.) 
WARNING 
DO NOT OPERATE THE 8020A UNTIL THE BATTERY COVER IS IN PLACE AND FULL Y CLOSED. 
2-16. The Display 
2-17. The Front Panel Display on your 8020A is a 3 1/2 digit Liquid Crystal Display. The 1/2 digit is the extreme left digit location. So, the displayed value can range from 000 through 1999. For convenience in discussion, the 1999 is rounded to 2000. The decimal point position is determined by selected range and is not affected by the measurement function selected. Polarity, on the other hand is only used for the de voltage and current measurement functions. A minus sign indicates that the input signal is negative with respect to the COM MON input terminal. Positive inputs are indicated by the absence of the minus sign. 
NOTE 
The minus sign (-) may flash momentarily as the B010A comes OUi of an overrange condition. This will most likely be seen in the ohms mode as the open circuit test leads are applied to an in-range resistance value. If the minus sign remains on for in-range ohms readings. the circuit is live (a negative voltage is present at the input terminals due 10 charged capacitors, etc.) and incorrect resistance readings will he observed. 
2-IS. The Display has two abnormal status indicators: low battery power and instrument overrange. A "BT" is displayed when approximately SO% of the battery'slife is exhausted (battery replacement is indicated). A "I" followed by three blanked digits is displayed (decimal point may be present) as an overrange indication. This does not necessarily mean that the instrument is being exposed to a damaging input condition. For example. when measuring resistance an open-input will cause an overrange indication. 
2-3 

8020A 
2-19. The liquid crystal display used in the 8020A is a rugged and reliable unit which will give years of satisfactory service. Display life can be extended by observing the following practices: 
I. Protect the display from extended exposure to bright sunlight. 
2. Keep the voltmeter out of high temperature, high humidity environments, such as, the dash of a car on a hot, sunny day, otherwise the display may temporarily turn black. Recovery occurs at normal operating temperature. 
3. Note that the display operation may be slowed in extremely low temperature environments. No damage will occur to the LCD, but response time is greatly increased. Recovery occurs at normal operating temperature. 
2-20. OPERATION 
2-21. Operation of the S020A is an easy, four step process: 
I. Set the power switch to ON. 
2. With reference to Figure 2-1, set the range and function switches for the desired measurement. 
Connect the test leads to the appropriate input terminals. See Figure .2-1. 
Contact the input signal and read the display. 
Use the following table to identify the desired measurement column, and 
set the pushbutton switches as indicated (see notes). Connect test leads to 
proper inout terminal 
						::>. 											
				DESIRED MEASUREMENT 		rj,nn:.a' 											
			Volta 	o 	mA 	11Cl 					I.UUU 						
			I--~ 	kCl 					Diode 								
			AC 	DC 	MCl 	AC 	DC 	200 	2 	Te.t 							
								nS 	mS 								
	..- 	• 	- 	- 	• 	- 	- 	- 	- 	ACIOC 	:J 	~:i .~1 					
	l:: .. 		- 	a 	- 	- 	• 	• 	a 	20MO 	~ 	=':~~ -I 					
	o () 																
CD %: ~ 	0 	0 	0 	a 	0 	• 	- 	- 	2000 	8= 	~,~.' ""i 						
.. <II .. 																	
:I: :> OJ 	0 	0 	0 	0 	0 	- 	- 	0 	200 		?lIO 11)0 lDD 						
o ... ' 																	
.. • 0 	0 	0 	0 	0 	0 	- 	- 		20 		~D zu 10 						
i ~ t 								- 									
., :I: <II 	0 	0 	0 	0 	0 	- 	• 	0 	2 	~ 	1 1 "1 						
	II> :> 									2000/mV 							
	:> G- 	o 	0 	0 	- 	- 	- 	- 	- 								
	Co 											P 		.. ~~ 			
	.__ 	- 	- 	• 	- 	- 	• 	• 	• 	mAlV,kOlnS 							
... '" 	HI 	HI 	HI 			HI 	HI 	HI(+) 		: .1@l~~1 							
",0 	- 	- 	- 	HI 	HI 	- 	- 	- 									
",00( 																	
... '" 	LO 	LO 	LO 	LO 	LO 	LO 	LO 	LO(-) 	~'"'."~ 								
	.... 																
s: 																	
NOTE 
• = IN (Conductance (1/0) ranges require depression of two range switches simultaneously) 
= OUT 
= DEPRESS ONE TO SELECT DESIRED RANGE 
HI = RED, HIGH INPUT LEAD 
LO = BLACK, LOW INPUT LEAD 
Figure 2-1. Selecting a Function and Range 
2-4 

8020A 
2-22. MEASUREMENT TECHNIQUES 
2-23. The following paragraphs offer you techniques that improve the measurement accuracy of your B020A. While these techniques arc in general use throughout the electronics industry. these paragraphs offer specific information for use with your B020A. 
2-24. AC Measurement 
2-25. The ac ranges of the S020A employ an average responding ac convener. This means that the unit measures the average value of the input. and displays it as an equivalent rms value for a sine wave. As a result. measurement errors are introduced when the input wave form is distorted (non-sinusoidal). The amount of error depends upon the amount of distortion. Figure 2-2 shows the relationship between sine. square and triangular waveforms. and the required conversion factors. 
2-26. Voltage AC/OC 
2-27. The 8020A is equipped with five ac and five dc voltage ranges; 200 mY, 2V, 20V, 200V, 750V ac/1000V de, All ranges present an input impedance of 10 Mfl. On the ac ranges, this is shunted by less than 100 pF. When making measurements. be careful not to exceed the overload limits given earlier in Table 2-1. 
2-28. Measurement errors. due to circuit loading. can result when making eitherac or de voltage measurements on circuits with high source resistance. However. in most cases the error is negligible (:;;;;01.%) as long as the source resistance of the measurement circuit is 10 kfl or less. If circuit loading docs present a problem. the percentage of error can be calculated using the appropriate formula in Figure 2-3. 
2-29. Current AC/OC 
2-30. Four ac and four de current ranges are included on the 8020A; 2 rnA. 20 m A, 200 rnA and 2000 rnA. Each range is diode protected to 2 amps and fuse protected above 2 amps. If the fuse blows. refer to fuse replacement information given earlier in this section. 
2-31. In high electrical noise environments (near ignition switches. flourescent lights, relay switches, etc.) unstable or erroneous readings (exceeding specifications) may occur. The effect is most obvious when measuring low level current on the 2 rnA range. If an erratic or erroneous reading is suspected. temporarily jumper the V j kfl connector to the rnA connector. This will ensure an accurate measurement. 
CAUTION 
To avoid possible instrument damage and/or erroneous measurements remove the temporary V IkO-to-mA jumper before attempting voltage or resistance measurements. 
2-5 

8020A 
				DISPLAY MULTIPLIER 				
INPUT WAVEFORM 	FOR MEASUREMENT CONVERSION 							
				PK-PK 	O-PK 	RMS 	AVG 	
SINE 		_l_ 						
P~ru 								
	PK-PK 	2.828 	1.414 	1.000 	0.900 			
	-r 							
RECTIFIED SINE (FULL WAVE) 								
P:m 	-~- 							
	PK-PK 	1.414 	1.414 	1.000 	0.900 			
	---r 							
RECTIFIED SINE (HALF WAVE) 								
PK.f\_f\ 	J_ 							
	PK-PK 	2.828 	2.828 	1.414 	0.900 			
0 		-r- 						
SQUARE 		_j_ 						
P:1"1 								
	PK-PK 	1.800 	0.900 	0.900 	0.900 			
	-,- 							
RECTIFIED SQUARE 								
PK -~- 								
nn PK-PK 	1.800 	1.800 	1.272 	0.900 				
o "T" 								
RECTANGULAR PULSE 	O=XIY 							
P:fxLJl 	.L 							
	PK-PK 	0.9/0 	0.9/0 	0.9/0% 	0.90 			
-I 	y 	J-- 	---r 					
TRIANGLE SAWTOOTH 	_L 							
=; 								
	PK-PK 	3.600 	1.800 	1.038 	0.900 			
	-,- 							
Figure 2-2. Waveform Conversion 
2-6 

S020A 
1. DC VOLTAGE MEASUREMENTS 
Loading Error in % = 100 x As (Rs + 107) 
Where: Rs = Source resistance in ohms of circuit being measured. 
2. AC VOLTAGE MEASUREMENTS 
First, determine input impedance, as follows: 
	Z in = 	107
y'1+ (21T F. Rin.C)2 
Where: Zin = effective input impedance Rin = 107 ohms 
Cin = 100 x 10 12 Farads F = frequency in Hz 
Then, determine source loading error as follows: 
100 x Zs Loading Error in % = As + Zin 
Where: Zs = source impedance Zin= input impedance (calculated) Rs = source resistance 
Figure 2-3. Voltage Measurement Error Calculalions 
WARNING 
INSTRUMENT DAMAGE AND OPERATOR INJURY MAY RESULT IF THE FUSE BLOWS WHILE CURRENT IS BEING MEASURED IN A CIRCUIT WHICH EXHIBITS AN OPEN CIRCUIT VOLTAGE >250 VOLTS. TO PREVENT THIS POSSIBILITY, PLACE A SUITABLE, MOUNTED AND INSULATED 1.SA FUSE OF THE PROPER VOLTAGE RATING (>2S0V) IN SERIES WITH THE HIGH (MA) INPUT LEAD. 
2-32. Full-scale burden voltage (voltage drop across the fuse and current shunt) for all ranges except 2000 mA is less than 250 mV. The 2000 mA range has a full-scale burden voltage of less than 700 mV. These voltage drops can affect the accuracy of a current measurement, if the current source is unregulated and the shunt plus fuse resistance represents a significant portion (1/1000 or more) of the source resistance. If burden voltage does present a problem, the percentage of error can be calculated using the formula in Figure 2-4. This error can be minimized by using the highest current range that gives the necessary resolution. For example. if 20 mA is measured on the 2000 rnA range the burden voltage is approximately 5 mV. 
2-7 

2-8 
8020A 
Esl T
e'
	EB 	'.
,
~ RI 
.A & 
'VV 
AMMETER SHUNT 
ES = Source voltage 
RL = Load resistance + Source resistance 
1M = Measured current (display reading in amps) 
EB = Burden voltage (calculated), i.e., Display reading expressed as a % of full-scale (100x READING FULL-SCALE) times full-scale burden voltage for selected range. See Table. 
RANGE 
0.25V 0.7V 
MAXIMUM BURDEN VOLTAGE 
2 mA to 200 mA 2000 mA 
Current error due to Burden Voltage 
IN% 
= 100 x 
ES - EB EB x 1M 
IN AMPS = ES -EB 
Example: ES = 14V, RL = 90, 1M = 1.497A, 1497 
EB = 100 x 2000 x 0.7 (from Table = 
74.9% of 0.7 = 0.524V 
		.524 	.524 
	Error in % = 100 		= 100 --- = 3.89% 
		14 - .524 	13.48 
Increase displayed current by 3.89% to obtain true current. 
Error in amps = .524 x 1.497= ~ = .058A 
	14 - .524 	13.48 
Increase displayed current by 0.058A to obtain true current. 
Figure 2-4. Current Measurement Error Calculations 

S020A 
2-33. Resistance 
2-34. Six direct reading resistance scales are provided on the 8020A; 20 MH. 2000 k!l. 200 kn. 20 kf], 2 kn and 2oon. All scales employ a two wire measurement technique. As a result. test lead resistance may influence measurement accuracy on the 2000 range. To determine the error. short the test leads together and read the lead resistance. Correct the measurement by subtracting the lead resistance from the unknown reading. The error is generally on the order of 0.2 to 0.3 ohms for a standard pair of test leads. 
2-35. In-circuit resistance measurements can be made using the 2oon. 20 kn and 2000 kH ranges. The open circuit measurement voltage produced on these ranges is not sufficient to forward bias silicon diode/emitter-base junctions. and thus. enables resistance values to be measured without removing diodes and transistors from the circuit. Conversely. the 2 kf], 200 kO and 20 MO ranges produce a measurement voltage sufficient to forward bias a P-N junction. These ranges enable both diode- and transistor-junction checks to be made conveniently. Maximum open circuit voltage and short circuit current for each resistance range is given in Table 2-2. All values shown are referenced to the COMMON input terminal; i.e .. the V/kH terminal is positive. 
Table 2-2. Voltage/Current Capability of Resistance Ranges 
RANGE 	FULL-SCALE 	SHORT CIRCUIT 	
	VOLTAGE (TYPICAL) 	CURRENT (TYPICAL) 	
20MO 	+SOO mV 	+0.12 µA 	
2000 kO 	+200 mV 	+0.12 µA 	
200 kO 	+SOO mV 	+12µA 	
20 «o 	+200 mV 	+12µA 	
2 «o 	+1.1V 	+1.0 rnA 	
2000 	+55mV 	+0.3 rnA 	
NOTE 
Any change (greater than one or two digits) in apparent resistance when test leads are reversed ma), indicate either the presence of a diodejunction or a voltage in the circuit. 
CAUTION 
Turn test circuit power off and discharge all capacitors before attempting in-circuit resistance measurements. 
2-36. The three resistance ranges with a diode symbol beside the range value have a high enough open circuit voltage to turn a silicon junction on. These ranges- 2kn,200 ~H. and 20 MH- can be used to check silicon diodes and transistors. The 2 kD range is preferred; it is marked with the largest diode symbol. On the ranges not marked with a diode symbol. the open circuit voltage is not high enough to turn a siliconjunction on. Use these ranges to make in circuit resistance measurements. For these tests the V / kH input terminal is positive with respect to COMMON input terminal. 
2-9 

2-37. CONDUCTANCE 

S020A 
2-38. The conductance ranges, 200 nS and 2 mS, are included on the S020A for making both conductance and resistance measurements. When either range is selected the display reads the measurement results in terms of conductance (1/ .0). If resistance readings are required, refer to the conductance-to-resistance conversion information given in Figure 2-5. 
2-39. The 200 nS range is intended for use in making fast, accurate, high-resistance measurements from 5 MH to 10,000 MH. Ordinarily, resistance measurements within this range are plagued by noise pick-Up and require careful shielding. However, by measuring the resistance in terms of conductance, standard test leads are adequate for the 8020A to make noise-free measurements clear up to 10,000 MH. High value resistors. and low leakage components (i.e., capacitors, diodes, etc.) are natural candidates for the 200 nS conductance range. Refer to applications later in this section for additional information. 
NOTE 
2-40. The 2 mS range, in terms of resistance, starts at 500.0 and goes up to I MH. It is intended for use in making either resistance measurements or direct-reading dc current gain (Beta) measurements on transistors. Beta measurements require the use ofa special test fixture, and are discussed later in this section under applications. 
2-41. APPLICATIONS 
2-42. The test applications described in the following paragraphs are suggested as useful extensions of the S020A measurement capabilities. However, they are not intended as the equivalent of manufacturer's recommended test methods. But rather, are intended to provide repeatable and meaningful indications which will allow operator to make sound judgments concerning the condition of the device tested; i.e., good, marginal, or defective. 
2-43. Transistor Tester 
The transistor tester described in the following paragraphs provides approximate test information. Beta is measured using a VeE of about 2 V and an IC of about 200 µA. It is very useful for comparative measurements and matching. 
2-44. Select the 2 mS range, plug the fixture shown in Figure 2-6 into the V /kH and COMMON input terminals, and you have transformed your S020A into a transistor tester. Now, plug a transistor into the test socket and the S020A will determine the following: 
I. Transistor type (NPN or PNP). 
2. Collector-to-emitter leakage (ICEs). 
3. Beta from I to 1000 without changing range. 
2-10 

S020A 

o c 
::. 
	<OtO<O"<to>U')r--N..- 			
	N"<ttOO<O,</,N..-O 			
~tq~"!c\!""":~ 	..-..- ..- 			
	<OtOMCONr--tO"<tN 			
	tOr--COOr--'</'N..-O 			
~U?C':!C\!C\!~~ 	~ ,..-.,..- 			
	tOOOMtO(J) 	o to M 		
	tOr--r-- ..... r--'</' 	M"-O 		
":U"?"?"!"!"",:,-: 	..-..- ..- 			
	to to to r-- 0> N 	N<O'</' 		
	NtOr-- ..... r--U') 	("'),..- 0 		
~~~"!C\!~~ 	..... ..- ..- 			
	r--O<ONN'</' 	M to to 		
	<00 to NtOU') 	M"-O 		
ll?~~~~~~ 	..... ..- ..- 			
	"<tr--vr--tOCOtOO>CO 			
~ .,.... .,- 0> C\I CO to 	M..-O 			
'''--:''''':c\!''!r:~ 	..-..- ..- 			
			I 	
	O>tOMMr--CI> 	,....... ..... c:xJ 		
	<OMOMtOU') 	MNO 		
M 	":~C'?"!~,..- 	,.....- ..- 		
	MLOMtON.-O>NO> 			
N 	MLO..-MO>COMNO 			
.~-.:::t:~C"!r:~r:r:"""': 				
	CI><OM"<t<O'</' 	.- M 0 		
	Or--N"<tO>CO'</'N.- 			
~ 	~~~~r:r: 	.- .... ..- 		
	OMOOr--MtO..- 			
	OMl.OO<OVN .... 			
C? 	,..-U?~C\!~r: 	............ 		
0 	..-NM"<ttO<or--COCl> 			
Z 				

Figure 2-5. Conductance-to-Reslstance Conversion 
2-11 

2-12 
S020A 

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Figure 2-6. Transistor Beta Test Fixture 

8020A 
2-45. Transistor type is determined by setting the switch on the fixture to BETA and observing the display. If a low reading (~0.01O) is obtained. reverse the test fixture at the input terminals. If the collector is now positioned at the COMMON input terminal, the transistor is a PNP type. An NPN type will have its collector positioned at the V I kfi input terminals. If the transistor is defective the indications will be as follows regardless of fixture position: 
I. A shorted transistor will cause an overload indication. 
2. An open transistor will read 0.001 or less. 
2-46. After the transistor fixture is properly positioned. set the switch to ICEs for the leakage test. The transistor is turned off in this test (base shorted to emitter), and should appear as a very low conductance (high resistance) from collector-to-emitter. Therefore. the lower the reading. the lower the leakage. Silicon transistors that read more than 0.002 (6 µA) should be considered questionable. 
2-47. Beta is determined by setting the fixture switch to BETA. and observing the display. Mentally shift the decimal point three places to the right and read Beta directly. For example, a display reading of 0.127 indicates a de current gain (Beta) of 127. 
NOTE 
Beta is a temperature sensitive parameter. Therefore, repeatable readings can only be obtained by allowing the transistor to stabilize at the ambient temperature while being tested. Avoid touching the transistor's case with your fingers. 
2-48. Leakage Tester 
2-49. The 200 nS conductance range effectively extends the resistance measurement capability of the S020A (up to 10,000 M!1) to the point where it can be used to provide useful leakage measurements on passive components. For example, you can detect leaky capacitors, diodes, cables, connectors, printed circuit boards (pcbs), etc. In all cases. the test voltage is <5V dc. 
2-50. RESISTIVE COMPONENTS 
2-51. Leakage testing on purely resistive components such as cables and pcbs is straightforward. Select the 200 ns range, install the test leads in the V Jkfiand COMMON input terminals, connect the leads to the desired test points on the unit-under-test, and read leakage cond uctance. If an overrange occurs, select the resistance range that provides an on-scale reading. 

NOTE 
S020A 
Under high humidity conditions (>80%) conductance measurements may be in error. To ensure accurate measurements connect dean test leads to the 8020Aand (with the leads open) read the residual leakage in nanosiemens. Correct subsequent measurements by subtracting the residual from the readings. (Finger prints or other contamination on the pcb may also cause residual conductance readings.) 
2-52. DIODES 
2-53. Diode leakage (I.R) tests require that the diode junction be reverse biased when being measured. This is accomplished by connecting the diode's anode to the COMMON input terminal and its cathode to the V /kn input terminal. Leakage can then be read in terms of conductance. In the event of an overrange, select a resistance range that provides an on-scale reading. 
I. Disconnect the capacitor from its circuit. 
2-54. CAPACITORS 
2-55. Capacitor leakage measurements are easily accomplished using the following procedure: 
2. Discharge the capacitor using a 1000. resistor. 
3. If the capacitor is polarity sensitive (electrolytic, etc.), identify the positive side and connect it to the S020A's V /kn input. Connect the negative side to COMMON. Non-polarized capacitors can be connected either way. 
4. Select the 2000. range and allow the capacitor to assume a charge (charge time is about 5 seconds or 10 seconds/ 100 µF, whichever is greater). 
5. Select the 200 nS range and allow the reading to stabilize. This may take awhile for larger capacitors. However, devices below I µF stabilize rapidly. 
6. Read the leakage in terms of conductance. Overrange readings indicate a short or excessive leakage. 
2-14 

S020A 
Section 3 
Theory of Operation 
3-1. INTRODUCTION 
3-2 This section of the manual contains an overall functional description followed by a block diagram analysis of the ~020A. A detailed schematic of the S020A appears in Section 7. 
3-3. OVERALL FUNCTIONAL DESCRIPTION 
3-4. The Model S020A as shown in Figure 3-1. is a hand-held, six function, digital multimeter. It features a total of 26 measurement ranges (V de, 5; Vac 5; k!l, 6; mA dc, 4; and rnA ac, 4 and conductance, 2), a high contrast easy-to-read, 3 1/2 digit, liq uid crystal display, long battery life (up to 200 hours); and overload protection for all ranges. 
3-5. Operation centers around a custom LSI chip, US, which is composed of a dual slope a/ d converter and a display driver. Peripherals to US include range and function switches, input signal conditioners and the display. When an input signal is applied to the S020A, it is routed through the range switches to one-of-four input signal conditioners as determined by the function switch setting. Each conditioner scales and, if necessary. rectifies the input so that an acceptable dc input level (-0.2 to +0.2V de) is presented to the a/ d converter. 
3-6. Timing for the overall operation of the aj d converter is derived from an external quartz crystal whose frequency is a multiple of the local line frequency. This allows the conditioned de input data to be integrated over a single line cycle, thus, optimizing both common mode and normal mode rejection. 
3-7. Digitized measurement data is presented to the display as four decoded digits (seven segments) plus polarity. Decimal point position on the display is determined by the range switch settings. 
3-1 

S020A 
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Figure 3-1. 8020A Simplified Block Diagram 
3-2 

S020A 
3-8. BLOCK DIAGRAM ANALYSIS 
3-9. AID Converter 
3-10. The entire analog-to-digital conversion process is accomplished by a single custom aId converter and Display Driver IC, U8. The IC employs the dual slope method of aId conversion, and requires a series of external components to establish the basic timing and reference levels required for operation. These include an integrating capacitor, an autozero capacitor, and a flying capacitor (for applying a reference level of either polarity). Since the power consumed for display operation is very low, the aj d converter IC also contains the display latches, decoders and drivers. 
3-11. The digital control portion of the aj d conversion process is an internalfunction of US, and is keyed to the external crystal frequency. As a result, the conversion process is continuously repeated, and the display is updated at the end of every conversion cycle. 
3-12. A simplified circuit diagram of the analog portion of the al d converter is shown in Figure 3-2. Each of the switches shown represent analog gates which are operated by the digital section of the aId converter. Basic timing for switch operation and, therefore, a complete measurement cycle is also included in the figure. 
3-13. Any given measurement cycle performed by the a/ d converter can be divided into three consecutive time periods. autozero (AZ), integrate (INTEG), and read. Both autozero and integrate are fixed time periods whose lengths are multiples of the clock frequency. A counter determines the length of both time periods by providing an overflow at the end of every 10,000 clock pulses. The read period is a variable time which is proportional to the unknown input voltage. The value of the voltage is determined by counting the number of clock pulses that occur during the read period. 
3-14. During autozero a ground reference is applied as an input to the aId converter. Under ideal conditions the output of the comparator would also go to zero. However, input-offset-voltage errors accumulate in the amplifier loop, and appear at the comparator output as an error voltage. This error is impressed across the AZ capacitor where it is stored for the remainder of the measurement cycle. The stored level is used to provide offset voltage correction during the integrate and read periods. 
3-15. The integrate period begins at the end oftheautozero period. As the period begins. the AZ switch opens and the INTEG switch closes. This applies the unknown input voltage to the input of the a! d converter. The voltage is buffered and passed on to the integrator to determine the charge rate (slope) on the INTEG capacitor. At the end of the fixed integrate period. the capacitor is charged to a level proportional to the unknown input voltage. This voltage is translated to a digital indication by discharging the capacitor at a fixed rate during the read period, and counting the number of clock pulses that occur before it returns to the original autozero level. 
3-3 

S020A 

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3-5 

8020A 
3-16. As-tile-read period begins, the INTEG switch opens and the read switch closes.This applies a known reference voltage to the input of the a/ d converter. The polarity of this voltage is automatically selected to be opposite that of the unknown input voltage, thus, causing the INTEG capacitor to discharge at a fixed rate (slope). When the charge is equal to the initial starting point (autozero level), the read period is ended. Since the discharge slope is fixed during the read period, the time required for discharge is proportional to the unknown input -~()ltage. 
3-17. The aut()~eroperiod and, thus, a new measurement cycle begins at the end of the read period. At the same time the counter is released for operation by transferring its contents (previousmeasurement value) to aseries of latchesrThjs stored data is then decoded and buffered before being used for driving the liquid crystal display. 
3-18. Input Signal Conditioners 
3-19. The aId converter requires two externally supplied-input voltages to complete a measurement cycle. One is reference voltage and the other isan unknown de voltage within the range of -O.2to+0.2V de, If the function being measured is other than a de voltage within the ±0.2 range, it must be scaled and/ or conditioned before being presented to the a/ d converter. For example, higher dclevels must be 'divided; ac inputs must be divided, rectified, and filtered; and resistance and current inputs must be scaled and converted to de voltage levels. The following paragraphs describe the input signal conditioners used for each of the S020A measurement functions. 
3-20. VOLTAGE MEASUREMENT 
3-21. Both the ac and de voltage ranges use an over-voltage-protected, 10 Mo. input divider as shown in.View A. Under normal conditions, assuming a de input level on the proper range, the divider output is a -0.2 to +O.2V de signal, and is an exact (power-of-IO) ratio of the input signal. If thev AGfunction is selected, the divider output is ac coupled to an active full-wave rectifier whose de output is calibrated to equal the rms level of the ac inputs. The conditioned signal for the selected function (V ac or V de) is then passed through a filter before being presented to the aId converter as the unknown input. 
3-22. CURREN1.,MEASUREMENT 
3-23. Current measurements are made using a fuse protected, switchable, four-terminal current shunt (0.10., 10., IOn, or 1000.) to perform the current-to-voltage conversion required by the aId converter. See View B. The voltage (J-R) drops produced across the selected shunt may be either ac or de depending upon the selected function, mA AC or mA DC. If the input currentisde and the de function is selected, the I·R drop is passed through a low-pass filter, and presented as the unknown input to the a/ d converter. However, if the input current is ac and the AC function is selected, the I'R drop is rectified by the ac converter before goi~g~othe low-pass filter. I~eit~er event thea/ d converter receives a dc input voltage proportional to the current passing through the selected shunt. 
3-6 

8020A 
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3-9 

S020A 
3-24. RESISTANCE MEASUREMENTS 
3-25. Resistance measurements are made using a ratio technique as shown in View C. When the kf] function is selected, a simple series circuit is formed by the internal reference voltage, a reference resistor from the voltage divider (selected by range switches), and the external unknown resistor. The ratio of the two resistors is equal to the ratio of their respective voltage drops. Therefore, since the value of one resistor is known, the value of the second can be determined by using the voltage drop across the known resistor as a reference. This determination is made directly by the aid converter. 
3-26. Overall operation of the a/ d converter during a resistance measurement is basically as described earlier in this section, with one exception. The reference voltage present during a voltage measurement is replaced by the voltage drop across the reference resistor. This allows the voltage across the unknown resistor to be read during the integrate period, and compared against the reference resistor during the read period. As before, the length of the read period is a direct indication of the value of the unknown. 
3-27. CONDUCTANCE MEASUREMENTS 
3-28. Conductance measurements are made using a ratio technique similar to that used in making resistance measurements. See View C. The main difference is that only two ranges are provided (200 ns and 2 ms), and the function of the range and unknown resistors in the measurement cycle is reversed. That is, the voltage drop across the range resistor is used as the unknown input during the integrate period, and the voltage across the unknown resistor is used for the reference input during the read period. As a result the display provides a reading that is the reciprocal (I/O) of the unknown input resistance, i.e., the higher the input resistance, the lower the display reading. 
3-10 

S020A 
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Some semiconductors and custom IC's can be damaged by electrostatic discharge during handling. This notice explains how you can minimize the chances of destroying such devices by: 
Knowing that there is a problem. 
Learning the guidelines for handling them. 

Using the procedures. and packaging and bench techniques that are recommended. 
The Static Sensitive (S.S.) devices are identified in the Fluke technical manual parts list with lhe symbol 
The following practices should be followed to minimize damage to 5.S. devices: 

MINIMIZE HANDLING 

2 	KEEP PARTS IN ORIGINAL CONTAINERS UNTIL READY FOR USE 

3 	DISCHARGE PERSONAL STATIC BEFORE HANDLING DEVICES 

4. HANDLE 5.S. DEVICES BY THE BODY 
3-11 

S020A 

USE ANTI-STATIC CONTAINERS FOR HANDLING AND TRANSPORT 

DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE 

AVOID PLASTIC. VINYL AND STYROFOAM IN WORK AREA 
3-12 

HANDLE s.s. DEVICES ONLY AT A STATIC-FREE WORK STATION 
ONLY ANTI-STATIC TYPE SOLDERSUCKERS SHOULD BE USED. 
ONLY GROUNDED TIP SOLDERING IRONS SHOULD BE USED. 
Anti-static bags, for storing S.S. devices or pcbs with these devices on them, can be ordered from the John Fluke Mfg. Co .. Inc .. See section 5in any Fluke technical manual for ordering instructions. Use the following part numbers when ordering these special bags. 
John Fluke 	Bag Size 	
Part No. 		
453522 	6" x 8" 	
453530 	8" x 12" 	
453548 	16" x 24" 	
454025 	12" x 15" 	

S020A 
Section 4 
Maintenance 
WARNING 
THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. 
4-1. INTRODUCTION 
4-2. This section of the manual contains maintenance information for the Mode1S020A. This includes service information, general maintenance, performance test, calibration and troubleshooting. The performance test is recommended as an acceptance test when the unit is first received, and later as a preventive maintenance tool to verify proper instrument operation. A l-year calibration cycle is recommended to maintain the specifications given in Section I of this manual. The test equipment required for both the performance test and calibration is listed in Table 4-1. If the recommended equipment is not available, instruments having equivalent specifications may be used. 
4-3. SERVICE INFORMATION 
4-4. The S020A is warranted for a period of 2-years upon delivery to the original purchaser. Conditions of the warranty are given at the rear of this manual. 
4-5. Malfunctions that occur within the limits of the warranty will be corrected at no charge. Simply mail the instrument (postpaid) to your nearest authorized (in-warranty) Fluke Technical Service Center. A complete list of service centers is provided at the rear of this manual. Dated proof-of-purchase will be required for all in-warranty repairs. 
~. Factory authorized service centers are also available for calibration and/ or repair of instruments that are beyond their warranty period. Contact your nearest authorized Fluke Technical Service Center for a cost quotation. Ship the instrument and remittance in accordance with instructions received. 
4-1 

S020A 
Table 4-1. List of Recommended Test Equipment 
INSTRUMENT 	REQUIRED CHARACTERISTICS 	RECOMMENDED 		
TYPE 		MODEL 		
		PREFERRED 		
DMM Calibrator 	John Fluke 5100A family 	John Fluke 		
			Models 	
			5100A,5101A,5102A 	
		ALTERNATE 		
AC Calibrator 	Voltage Range: 0 to 750V ac 	John Fluke Models 		
	Frequency Range: 100 to 5 kHz 	5200A and 5215A 		
	±0.25% 			
	Voltage Accuracy: 100 to 1 kHz 			
	±0.1% 			
DC Calibrator 	Voltage Range: 0 to 1000V dc 	John Fluke Model 		
	Accuracy: ±0.025% 	343A 		
DC Current 	Current Range: 2 mA to 2A 	John Fluke Model 		
Calibrator 	Accuracy: ±0.2% 	382A 		
Resistor 	Resistance Values: 1900, 1.9 kO, 19 	ESI Model DB62 		
Decade or 	kO, 190 «o. 1.9 MO, and 10 MO 			
Individual 	Accuracy: ±0.025% 			
Resistors 	Power Rating: ~1/S watt 			
4-7. GENERAL INFORMATION 4-8. Access Information 
NOTE 
To avoid contaminating the pcb with oilfrom the fingers, handle it by the edges or wear gloves. If the pcb does become contaminated. refer to the cleaning procedure given later in this section. 
4-9. CALIBRATION ACCESS 
4-10. Use the following procedure to access the S020A calibration adjustments. 
I. Set the power switch to OFF. 
Disconnect test leads and battery eliminator, if attached. 
Remove battery cover and battery from compartment. 
Remove the three phillips-head screws from the bottom of the case. 
S. Turn the instrument face-up and grasp the top cover at both sides of the input connectors. Then, pull the top cover from the unit. 
6. All adjustments necessary to complete the calibration procedure are now accessible (see Figure 4-1). 
4-2 

'SHIELD 
	• 	I	 ACCAL 
	_ 	I	 DC CAL 
	• 	I	 HFADJ 
*Shield must be in place when making HF adjustment. 
Figure 4-1. Calibration Adjustment Locations 
4-11. COMPONENT/PCB ACCESS 
4-12. Use the following procedure to remove the Main PCB Assembly from the case: 
I. Complete the calibration access procedure. 
2. Remove the screw from the shield. 
3. Using your index finger. lift the lower right-hand corner of the pcb. When the pcb is freed. pull it to the right until it clears the shelf under the buttons. and then lift up. 
4. To reassemble, logically reverse this procedure. 
NOTE 
When installing pcb. route battery-clip wires behind the post on the lefthand side of bottom case, and thread battery-clip through the battery-cover opening. Also make sure that the removable plastic lip that resides beneath the range switch pushbuttons is properly installed in the bottom case. Green power switch cap should also be mounted on the power switch. 
8020A 
4-3 

S020A 

4-13. DISPLAY ACCESS 
NOTE 
4-14. Use the following procedure to remove/replace the liquid crystal display: 
I. Remove the pcb assembly using the componentj pcb access procedure. 
2. Using your thumb, carefully pull one of the white display-lens snaps away from the lens. When clear, lift the lens away from the display. 
CAUTION 
Do not slide the lens out of the display mount. This will scratch the lens. 
3. The display can now be lifted from the mount. 
4. To reassemble the display, logically reverse this procedure. 
An Elastometric contact strip is located at the top of the liquid crystal display. See Figure 5-2. When assembling the display, this strip should be located between the display and the pcb interconnect cable. 
4-15. LSI (US) ACCESS 
4-16. Use the following procedure to remove/replace the A/D Converter and Display Driver IC, US. 
I. Remove the pcb assembly using the componenr/pcb access procedure. 
2. On the bottom of the pcb locate and remove the two phillips-head screws from the display assembly. 
3. Lift the display assembly from the pcb to expose U8. 
CAUTION 

U8 is a MOS device and is subject to damage by static discharge. Observe the precautions given later in this section under troubieshoooting before attempting to remove or replace US. 
4. Use a screw driver or a reasonable substitute to rock (by prying up on each end of the IC) the IC out of its socket. 
5. When installing US make sure all pins are lined up in the socket, and then carefully press it into place. 
6. When reinstalling the LCD Bracket, be sure to line up the flex cable holes with the extensions on the bracket before tightening the bracket screws. 
4-4 

8020A 
4-17. Cleaning 
CAUTION 
Do not use aromatic hydrocarbons or chlorinated solvents for cleaning. These solutions will react with the plastic materials used in the instrument. 
CAUTION 
Do not get the liquid crystal display wet. Remove the Display Assembly before washing the pcb and do not install it until the pcb has been fully dried. 
4-IS. Clean the front panel and case with a mild solution of detergent and water. Clean dust from the circuit board with low pressure «20 psi) dry air. Contaminates can be removed from the circuit board with demineralized water and a soft brush (remove the Display Assembly before washing, and avoid getting excessive amounts of water on the switches). Dry with clean, dry air at low pressure, and then bake at 50 to 6O°C(124-140° F) for 24 hours. 
4-19. BaHery/Fuse Replacement 
WARNING 
BATTERY/FUSE REPLACEMENT SHOULD ONLY BE PERFORMED AFTER THE TEST LEADS HAVE BEEN REMOVED FROM THE INPUT JACKS, AND THE POWER SWITCH IS SET TO OFF. 
4-20. Refer to Sections I and 2 of this manual for battery and fuse replacement procedure. Use only the recommended replacement types. 
4-21. PERFORMANCE TEST 
4-22. The performance test is used to compare the S020A performance with the list of specifications given in Section I of this manual. It is recommended for incoming inspection, periodic maintenance, and to verify specifications. If the instrument fails any part of the test, calibration and/ or repair is indicated. 
4-23. Initial Procedure 
4-24. Each of the individual procedures that comprise the performance test assumes that the following conditions exist. 
I. The unit has been allowed to stabilize and will be tested at an ambient temperature of 23 ±5° C (73 ±9° F). 
2. The fuse and battery have been checked and. if necessary, replaced. 
3. The power switch has been set to ON. 
4-5 

8020A 
4-25. Display Test 
4-26. The following procedure is used to test the operation of all display digits and segments. 
I. Select the 20 k!1 range. The display should be blanked with the exception of the overrange indicator (I) in the left hand column and a decimal point in the center of the display. 
2. Connect a decade resistor between the V Ikfl and COM MON input terminals. 
3. Connect a decade resistor to 10 k!1 and verify a display of 10.00 ±3 digits. 
4. Sequentially increase the resistance in 1.11 k!1 steps and verify the operation of each digit and its segments. 
5. Disconnect the decade resistor at the input terminals, and select the 2000 k!1 range. A decimal point should not be displayed. 
6. Sequentially select the 200, 20 and 2 kfl range. The decimal point should appear in the tenths, hundredths, and thousandths position, respectively. 
4-27. Resistance/Conductance Test 
4-28. The operation and accuracy of the resistance and conductance ranges are tested in the following procedure. 
I. Connect the decade resistor between the V I k!1 and COMMON input terminals. 
2. Refer to Table 4-2, and select the range and input conditions specified in step I. Verify that the display reading is within the limits shown. 
3. Execute and verify steps 2 through 8 of Table 4-2, using the procedure described in step 2. 
Table 4-2. Resistance/Conductance Check 
		JOHN FLUKE 	ESI MODEL DB62 			
Q, 		5100A/5101A/5102A 				
w 	RANGE 					
t- 		INPUT 	DISPLAY 	INPUT 	DISPLAY 	
en 						
		RESISTANCE 	READING 	RESISTANCE 	READINGS 	
1 	200.0 	Short 	00.0 to 00.2 	Short 	00.0 to 00.2 	
2 	2 k.o 	Short 	0.000 to 0.001 	Short 	.000 to 0.001 	
3 	200.0 	190.0 	189.3 to 190.7 	100.0 	99.5 to 100.5 	
4 	2 k.o 	1.9 k.o 	1.897 to 1.903 	1 «n 	.998 to 1.002 	
5 	ao xn 	19 k.o 	18.97 to 19.03 	10 k.o 	9.98 to 10.02 	
6 	200 k.o 	190 k.o 	189.7 to 190 .. 3 	100 k.o 	99.8 to 100.2 	
7 	2000 k.o 	1900 k.o 	1897 to 1903 	1000 k.o 	998 to 1002 	
8 	20M.o 	10 M.o 	19.80 to 10.20 	10 M.o 	9.80 to 10.20 	
9 	200 nS 	10 M.o 	97.0 to 103.0 	10 M.o 	97.0 to 103.0 	
10 	200 nS 	Open 	01.0 to 00.0 	Open 	01.0 to 00.0 	
				~ -~ 		
4-6 

8020A 
4-29. DC Voltage Test 
4-30. Use the following procedure to check the accuracy and overall operation of the de voltage ranges. 
WARNING 
CONNECT THE GROUND/COMMON/LOW SIDE OF THE VOLTAGE CALIBRATOR TO COMMON ON THE 8020A. 
I. Set the dc voltage calibrator for a zero volt output. 
2. Connect the calibrator output to the V / k.!1 and COM MON input terminals of the 8020A (calibrator ground/common/low to 8020A). 
3. With reference to Table 4-3, select the S020A voltage range given in step I, and set the calibrator output to the corresponding S020A input voltage. Verify that the display reading is within the limit shown. 
4. Execute and verify steps 2 through 7 of Table 4-3. using the procedure described in step 3. 
Table 4-3. DC Voltage Test 
STEP 	VOLTAGE 	INPUT 	DISPLAY 	l 	
	RANGE 	VOLTAGE,DC 	READING 		
1 	200mV 	+190.0 mV 	189.7 to 190.3 		
2 	200mV 	-190.0 mV 	-189.7 to -190.3 		
3 	2V 	O.OV 	-.001 to .001 		
4 	2V 	+1.9V 	1.897 to 1.903 		
5 	20V 	+19V 	18.97 to 19.03 		
6 	200V 	+190V 	189.7 to 190.3 		
7 	1000V 	+1000V 	998 to 1002 		
4-31. AC Voltage Test 
4-32. The ac voltage ranges are checked for accuracy and operation using the following procedure. 
WARNING 
CONNECT THE GROUND/COMMON/LOW SIDE OF THE AC CALIBRATOR TO COMMON ON THE MODEL 8020A. 
I. Set the ac calibrator for a zero volt ac output. 
2. Connect the calibrator output to the V! kO and COM MON input terminals for the S020A (calibrator ground/common/low to S020A COMMON). 
4-7 

8020A 
3. With reference to Table 4-4, select the S020A voltage range given in step I, and set the calibrator output to the corresponding S020A input voltage and frequency. Verify that the display reading is within the limits shown. 
4. Execute and verify steps 2 through 12 of Table 4-4, using the procedure described in step 3. 
Table 4-4. AC Voltage Test 
	VOLTAGE 		INPUT 	DISPLAY 			
STEP 	RANGE 				READING 		
		VOLTAGE 	FREQ. 				
1 	200 mV 	Short 	- 	00.0 to 00.2 			
2 	200mV 	190 mV 	100 Hz 	188.4 to 191.6 			
3 	200mV 	19 mV 	100 Hz 	18.7 to 19.3 			
4 	200 mV 	190 mV 	5 kHz 	180.0 to 199.9 			
5 	2V 	1.9V 	5 kHz 	1.800 to 1.999 			
6 	2V 	1.9V 	100 Hz 	1.884 to 1.916 			
7 	20V 	19V 	100 Hz 	18.84 to 19.16 			
8 	20V 	19V 	5 kHz 	18.00 to 19.99 			
9 	200V 	100V 	2 kHz 	98.2 to 101.8 			
10 	200V 	190V 	100 Hz 	188.4 to 191.6 			
11 	750V 			100 Hz 		1 	
		750V 		741 to 759 			
12 			NO TEST 				
9 	200V 	190V 	2 kHz 	186.9 to 193.1 			
10 	200V 	190V 	100 Hz 	188.4 to 191.6 			
						2 	
11 	750V 	750V 	100 Hz 	741 to 759 			
12 	750V 	750V 	1 kHz 	741 to 759 			
1 Perform if using John Fluke 5100A/5101A15102A. 
2 Perform if using alternate equipment listed in Table 4-1. 
4-33. DC Current Test 
4-34. The following procedure is used to check the operation and accuracy of the DC current ranges. 
I. Set the output of the de current source to zero rnA. 
2. Connect the output of the current source to the rnA and COMMON input terminals on the S020A. 
3. With reference to Table 4-5, select the S020A current range indicated instep I, and set the calibrator output to provide the corresponding S020A input current. Verify that the display reading is within the limits shown. 
4. Execute and verify steps 2 through 4 of Table 4-5, using the procedure described in step 3. 
4-8 

8020A 
Table 4-5. DC CUrrent Test 
STEP 	CURRENT 	INPUT 	DISPLAY 	
	RANGE 	CURRENT,DC 	READING 	
1 	2 rnA 	+1.9 rnA 	1.885 to 1.915 	
2 	20 rnA 	-19 rnA 	-18.85 to 19.15 	
3 	200 rnA 	+190 rnA 	188.5 to 191.5 	
4 	2000 rnA 	+1900 rnA 	1885 to 1915 	
4-35. CALIBRATION 
4-36. Under normal operating conditions, the S020A should be calibrated once a year to maintain the specifications given in Section I of this manual. If instrument repairs have been made or if the unit fails the performance test, immediate calibration is indicated. Equipment required for calibration is given in Table 4-1. If the necessary equipment is not available, your nearest authorized Fluke Technical Service Center will be happy to help. A list of these service centers. as well as shipping information, is given at the back of this manual. 
4-37. Use the following procedure to calibrate the S020A. 
NOTE 
This procedure assumes an ambient temperature 0/23 ±2° C (70 to 77" F) and a relative humidity of less than 80%. The temperature of the unit should be allowed to stabilizefor at least 30 minutes before calibration begins. 
I. Remove the top cover from the S020A using the access procedure given earlier in this section. 
2. Set the S020A power switch to ON and select the 200 mV DC range. 
3. Set the output of the dc calibrator to +190.0 mV and connect it to the S020A input terminals; + to V jUl, and - to COMMON. 
4. Adjust the DC CAL pot (R6), as shown in Figure 4-1, for a display of 190.0 or 190.1. (Use a plastic adjustment tool or a common plastic screw driver for all adjustments.) 
5. Disconnect the dc calibrator from the S020A input terminals. 
6. Select the 200 m V AC range on the S020A. 
7. Set the output of the ac calibrator to 190 mV at 100 Hz, and connect it to the S020A input terminals; V/kfl and COMMON. 
4-9 

S020A 
8. Adjust the AC CAL pot (R4) for a display of 190.0 (an occasional flash of ±I digit is acceptable). 
9. Select the 2V ac range on the S020A and set the ac calibrator output to 1.9Vat 5 kHz. 
10. Adjust the HF ADJ (CI) for a display of I.S95 to 1.905. 
II. Execute the performance test given earlier to ensure that all fixed range resistors and other non-adjustable components are operating within their specified limits. 
4-38. TROUBLESHOOTING 
CAUTION 
Static discharge can damage MOS components contained in the 8020A. 
4-39. When troubleshooting or repairing the S020A use the precautions listed on the Static Awareness sheet to prevent damage from static discharge. Never remove, install or otherwise connect or disconnect components without first turning the 8020A power switch to OFF. 
4-40. A troubleshooting guide for the S020A is given in Table 4-6. To properly use the guide complete the performance test given earlier in this section and note any discrepancies. Then locate the heading of the procedure in question in the Test and Symptom column (Table 4-6). Under that heading isolate the symptom that approximates the observed malfunction. Possible causes are listed to the right of the selected symptom. Details necessary to isolate a particular cause can be derived from the theory of operation in Section 3 and the schematic diagram in Section 7. 
Table 4-6. Troubleshooting Guide 
TEST AND SYMPTOM 	POSSIBLE CAUSE 	
INITIAL PROCEDURE 		
ST is displayed when unit is 		
turned on. 	Low battery, Q2, U7, U8. 	
Display blank. 	Dead battery, power switch, VR2, 	
	shorted, US. 	
DISPLAY TEST 		
One or more segments will 		
not light through entire test. 	Display interconnect, display, or AID 	
	Converter US. 	
Decade inoperative or one or 		
more segments always lit. 	US. 	
4-10 

S020A 

TEST AND SYMPTOM 
POSSIBLE CAUSE 
Improper decimal p o in t indication. 
Minus sign improperly displayed. 
Display I it but does not respond to changes in input. 
RESISTANCE/CONDUCTANCE TEST Displayed reading is out of tolerance on at least one but 
not all ranges. 
Readings are noisy on all ranges 
Readings are out of tolerance on high ohms. 
Residual reading with test leads open. 
DC VOLTAGE TEST 
Display reading is out of tolerance on 200 mV range. Readings are out of tolerance on all ranges except 200 mV. 
AC VOLTAGE TEST 
Displayed reading is out of tolerance on 200 mV range. 2V range is out of tolerance with 1.9V, 4 kHz input. 
Readings out of tolerance on all ranges except 200 mV. 
DC CURRENT TEST 
Input does not affect display. 
Displayed reading is out of tolerance on one or more ranges. 
CALIBRATION 
DC CAL pot at limit. AC CAL pot at limit. HF adjust at limit. 
Range switches, U6, U7, or display. (Check signals at U7 to isolate.) 
US. 
Reference VRi, crystal Y1, A/D Converter U8. 
Range resistor trt. 
Thermistor RTi. 
RVi, RV2, RV3, RV4 overheated from severe overload. 
PCB is contaminated (see cleaning procedure, Section 4). 
Out of calibration (DC),Vref (VRi) in error, US, U8, S1. 
Range resistor U1, U2, U3. 
Out of calibration (AC), AC converte defective. 
HF adjust (C't) out of calibration. 
ut. 
Fuse Fi open, CRi, CR2. 
If 2000 mA and 200 mA ranges are okay, U2 is defective. Otherwise U3 is defective. 
VR1, US or R6. 
U4, CRS, CR6, R4, ARi, dc calibration S3D, Uf , C1, shield not installed. 
4-11/4-12 

S020A 
Section 5 
List of Replaceable Parts 
5-1. INTRODUCTION 
5-2. This section contains an illustrated parts breakdown of the instrument. A similar parts listing for each of the Options will be found in Section 6. Components are listed alphanumerically by assembly. Both electrical and mechanical components are listed by reference designation. Each listed part is shown in an accompanying illustration. 
5-3. Parts lists include the following information: 
I. Reference Designation. 
2. Description of each part. 
3. FLUKE Stock Number. 
4. Federal Supply Code for Manufacturers. (See Table 5-4.) 
5. Manufacturer's Part Number. 
6. Total Quantity per assembly or component. 
7. Recommended Quantity: This entry indicates the recommended number of spare parts necessary to support one to five instruments for a period oftwo years. This list presumes an availability of common electronic parts at the maintenance site. For maintenance for one year or more at an isolated site, it is recommended that at least one of each assembly in the instrument be stocked. In the case of optional subassemblies, plug-ins, etc., that are not always part of the instrument, or are deviations from the basic instrument model, the REC QTY column lists the recommended quantity of the item in that particular assembly. 
5-4. HOW TO OBTAIN PARTS 
5-5. Components may be ordered directly from the manufacturer by using the manufacturer's part number, or from the John Fluke Mfg. Co., Inc. factory or authorized 
5-1 

S020A 
representative by using the FLUKE STOCK NU MBER. In the event the part you order has been replaced by a new or improved part, the replacement will be accompanied by an explanatory note and installation instructions if necessary. 
5-6. To ensure prompt and efficient handling of your order, include the following information. 
I. Quantity. 
2. FLUKE Stock Number. 
3. Description. 
4. Reference Designation. 
5. Printed Circuit Board Part Number. 
6. Instrument Model and Serial Number. 
CAUTION 
~ 
Indicated devices are subject to damage by static discharge. 
5-2 

8020A 
Table 5-1. 8020A Final Assembly 
	WW 	~ 
c:nc 
	:::Iu	 ~ 
u>- 
WI- 
a:o 
	:;~ 	__ 	_ 	_<r- 	C"f'l- 	__ 
1-0 
	. 	til 
	o 	.... 
	2 	I>:; 
co: 
	I- 	110 
	a:w 	!iii 
	c( Q.. 	..:I 
	Q..~ 	~ 
	t.:I 	!iii 
	u... a: 	(.) 	C\I U"'\ 	('t'l 	fW"lCO __ 0'\ 0'\ 	to- 
	20 	co: 	In-O N~ tnNO\CO 	~ 
		..:I 	~ ..... coo O\##M 	co 
		110 	tn~ -00 ~-O~#O\ In 
		~ 	-~ ~~ ~o~~~ ..- 
		~ 	~# ~- ~U"'\~~~ 	~ 
-O~ -0# -o~~-o~ -0 
	>-w 	~ 	M ..... MM ............... M .......... 
	t.:I~C 	$ Intn In~ tnlntntntn In 
	~~~	 0 $$ $~ ~~$$~ $ 
NIJ"'\ m\O ('I"')tX)-O\O\ 1- 
	w~ 		~ 		~~ NO IJ"'\N~~M _ 
	~u 		!iii 		# ..... COO\ O\##Mm co 
	~eci 		~ 		~~ ~~ ~~~~~ ~ 
	~(f)2		 0 		In# #N ~In~## In 
					~ 	~ 		IX: 
	2 				~ ~ ~ 		~ 
	o 				g~ ~ g 		g 
	~ 	~ 			tIl~ ~- J 		2 
	Q....l 			......... r", ~::co 	IX: 	U· 
	a: 	~ 			0 OUNZ 0 	~ 
! 	~ 	~ 			!iii 3" ~i~g~ ~ ~z 
	~ 	~ 			~I""~ ~ .... ~~~ ~ o~ 
		co: 			~In..:l I 	::co O~ Ilo 	!iii .... 
				~ 	0 ON .... ZIX:ZIX: 0 	..:IU 
		..:I~~N..l ~tIl!lil> 	~~H"" 	..:I1IiI 
		CO:I..lI~ U IX: I - 	3:~tIl 	- <til 
		~tn~tnX IX:Z~O\Ilo IloWOIX:Z 0 	.... 
		~&l~IIiI~ g~~ _g'! g'!~"'~H 	~ 	ge~ 
		IX: til = til tIlllo r", ~ 	I>l -U - U 	Hen 
		-~WO< 	0 IX: 	-..lZ..l 
		<O<CI 	<IX:1il1lil3 3: 0 -< IIiI 
		OH HI>l tIl~I>l""1IiI 1IiI 	I>lO 0 
		Nr",~~tIl ~I>len .... p:; IX:W 	WZ H 	~ 
		o U < 	<U UIilO« 	0 
		~ Ilo 	U 	~W tIl .... ~ux CI 	~ 
e 
		.-- 	.--NcYl 
	,.- N 	E-t_ No.. £lot 
	< < < 	~::z: ::cx~x 
5-3 
~

8020A 								
				Table 5-2. A2 Case Assembly 				
wW 								
Cl)0 								
;:,u 								
u> 								
WI- 								
O:Cl 								
~~ 	rz. 	~ 	~~ 	~ 	----- 			
01- 							N 	
I-Cl 		tiel 						
		~ 						
0 								
2: 								
I- 								
O:w 								
eta.. 								
a.. > 								
I- 								
CI 								
u.o: 	I 		N=- ~ 	'l> 	o t-ll'\ 	.:0 co .X) ,..- .- 	co 	
:20 			ll'\ ~ =- 	'" 	o co =- 	-- 0\ (V'lX) 0 	co 	
			.:I'N=- 	ll'\ 	t- LO =- 	r- t- 0\.:0 - 	ll'\ 	
			ll'\ ll'\ co 	'l> 	o =- ll'\ 	Ot-COl!'\"X) 	co 	
			~ON 	'" 	LO ll'\ ~ 	ll'\ONll'\O 	ll'\ 	
			ll'\ LO =- 	=- 	=- .,.. ll'\ 	.:::t L('\ =:r .::r l.C\ 	.,.. 	
c.:J>~ 			'l> 'l> -a 	'l> 	-a "" -o 	\0 \0 \0 \0 \0 	-a 	
			C\"l (V) (V) 	(V) 	(V) (V) (V) 	Mm(V)(V'lM 	(V) 	
..,_.~o 			LO LO LO 	LO 	ll'\ LO LO 	t.n a..n I.t'\ lJ"\ l.l'\ 	LO 	
			a- a- ov 	a- 	a- a- a- 	m 0'\ 0'\ CJ'\ C'\ 	'" 	
:2C1)U 			eo 0::> <Xl 	co 	co 0::> co 	0::> 'X) co 0::> <X) 	co 	
W:.;: 			N.:I'~ 	-a 	o t- LO 	':o-x> CO .-.- 	'X) 	
			l..C\-.::r 	0\ 	o co =- 	,.... CJ'\ CV')a:) 0 	.x> 	
:.;:U 			.:I'N.:I' 	ll'\ 	t- ll'\.=t' 	r:-t- 0'\ '.X) .- 	ll'\ 	
;:, 0 . 			LO ll'\ 0::> 	-a 	o.=t'll'\ 	Ot--Dl.C\OC) 	.;0 	
..... 1-0 			~oN 	'" 	ll'\ll'\~ 	tnONI1'\O 	LO 	
u..CI)2 			LO LO.=t' 	.=t' 	.=t'.=t' LO 	.:::t" 11"\.:::t.::r LC\ 	.=t' 	

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MP3* 
I 
-. 
H2 
*Part of the A2 Case Assembly 
Figure 5-1. 8020A Final Assembly 
8020A 
MP1* 
MP9* 

MP5* 

5-5 

S020A 
1-> 01- I-d 
lillA 
u> WICCd 
5-6 
o 2: 
ICCw « .... .... > 
IC!J u..cc ::Eo 
2: o 
~ 
.... 
CC u en W o 
u..en w W cc:c 
Table 5-3. A1 8020A PCB Assembly 

o \00 M \0 0 00 Ll'I .~ 00 0 00 ~ M-=-=- Ll'I -=- 
\0 (\J \0 MOO M Ll'IO'\ IC'I 0'\ (\J 0'\ 00 t- 00 
\0\0 M \0 0 00 tl"\C\I ~ eo co 00 ~ ~-=-=- (\J -=- 

> o o o 
~ 

("'t")- ('t')M(\j r:- co .- C\J 0'\ t-t--'-O\.O 1..O\.O\"oMLl'\ .:::t =- (V) 0'1 0 =r.:::t.:::t __ 
> o o 
~ 
> 
o 0> ~O 
o 

O~C\I 
M.:::tI.C\'...ot- 	rX)0\.-~_ 
uuuuu UUUUU 

o 0 co GO GO 	GO 
OO.:::t.:::t=t' 	.:::t 
.::t".:::t.::t'..::t.::r 	.:::t 
1.t'\L(\=t".:::t.:::t 	.::t" 
ZZZZZ Z 
..- _ ....... ..- ...... ,.- 
t-t-ooo 0 t-t---- ...C\I N 0'\ 0\ 0'\ 0'\ LC'\ Lf\ r:- t- r:- e-. 00000 0 

HHHHH rIlrllrllCl)(J) 
UlUlWI>Jr.l 00000 00000 H H HHH OOOOQ 
...- N (Y)...:::t" Ll""I 	\..0 
0:::; a:: 0:: a; a:: 	0::;.- 
UUUUU UI%. 
C\I 

8020A 
Table 5-3. A 1 8020A PCB Assembly (cont) 
c:i 									
;2 									
I- 									
a:w 									
c::(o.. 									
0..>- 									
	I- 								
(!l 									
u.a: 	I (\J t'- 	OM 	.::t' \,Q '" t- 	t'- 0 	'" t'- 	O"IoO\-otn 	C\J-OLOlt"I 		
20 	'" '" 	~~ 	('t").:::t'Lna) 	'" ~ 	Ol!'\ 	t.n U"'\ .::t' '!X) l.f\ 	C\J lI\ (Y"}.::t (Vl 		
		o co 	'" ~ 	r:- 1:"-. t- t- 	t'- 0 	co 0 	a::>cooO{\J 	t'-Ot-(\JO 	
		MM 	M=r 	OMOf't) 	0", 	0", 	(Y")cY)-~C\I 	t--t-N- 	
		I!'\ (\J 	I!'\ I!'\ 	l!') ll"I t.l\!.C\ 	I!'\ I!'\ 	lI\ I!'\ 	OOOOCllt'-lXl 	=ral~"'tll 	
		=r ~ 	=r =r 	.::T =r..:::t.::r 	=t' . .=:- 	~ =r 	=r=ro=ru 	~o~uu 	
	WI'" '" 	<.0 <o 	\0 1.0 \.0 \.0 	-c -o 	<.0 <.0 	\.0 '-0 ..- \.0 .- 	1.0-'-0-- 		
t:J>0 MM 	MM 	(Y) M ("t) {'f""} 	MM 	MM 	(Y)cYlC\lCV'lC\l 	M(\Jrtl(\J(\J 			
u..~o ~.~ 	I!'\ I!'\ 	II) LC'\ U'\ fJ') 	I!'\ I!'\ 	lI\ I!'\ 	1.C'\t!)-LO- 	t.n-tn-- 			
	'" ov 	0\ 0" ~ 0" 	'" '" 	'" '" 	0\ 0'\ .- 0'\ - 	0\-0\-- 			
2",,(..) coco 	co co 	0:'1 co co eo 	co co 	:0 ::0 	cocoocoo 	COOCOOO 			
w ~ /(\J t'- 	OM 	.::t'\OO\t- 	t'- 0 	'" t'- 	O--O"ot-O·O 	C\I MOt-"" 			
~(..) g:;:; 	~~ 	cY"l.::t"L()CO 	<.0 =:t 	Oll'l 	1.('\ I.l"\ Q'\ co 0'\ 	(\J '" rtl M 0 			
	'" .... 	t- t- t- r- 	t'-O 	co '" 	;:X>C:O(V'lom 	t-t- t"-O\- 			
::lo • MM 	M=r 	QMOC'Y'l 	o a- 	00 	("t") ('\""')O\.:r co 	t- '" t'- 0 co 			
-'1-0 U)C\J 	I!'\ l!) 	II) ll"I lC'\Ln 	l!) '"' 	I!'\ IC\ 	co co 0 r:-O'\ 	=l"0.::t' \O.::t' 			
LLcnZ ..::r.:::r 	=r =r 	.::t' .:::r.::t'.::t' 	=r =t' 	~ =r 	..:::r-.:::r.,..-.=t' or- 	.:::t-.::t'-~ 			

wW ",,0 ::l(..) 

(..)>WIa:CS 
1->- 
01- I~~~ 
I-CI 

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_:3: - o C\J .'" ~ ll'I 

I - I ,-, 
+ 0 + 
~ 

l>d1:E O'(\J Z Z 0 + • o..a..- (\J zz l>.: 
- -- 
b'l~~LC'\~ 

0001l!) _._._ <, I 
I I 1+' 
........................ + 
+ + + l>.: 
O:.d O:EONO O-ON~ M IC\ 

5-7 

B020A 
WW eno ;:)1..) 
Table 5-3. A1 8020A PCB Assembly (cont) 
o :2 
IC:w «0.. 0..> 
It:I 
u.. c: :2;0 

1-> 01- I-CI 

1..» WIC:CI 

tn...o...ol.OO (Y) ("r") ("t"") M.-t- t.n U"\ L{\ 0\ N 0\ 0\ 0'\ toco co eo 0 

s 
I 
a.. 00 .:I' ll"I lIlll"l ..l0 H -<) 0.:1' 
C\J-<) C\J ('f) 
'" ll"I '" '" 000 
C\J 0 00 ll"I C\J In 
'" 0 C\J <o 
.:I' .:I' 

\0 .::r:::t.:::t.::t' 
(V)..- ..--..- ..- 
II'\NNNN 0\ 0\ ~ 0'\ 0\ cooooo 

5-S 

:2 o 
~ 
c: c.J en W o 

S020A 
shapeType75fBehindDocument1pWrapPolygonVertices8;8;(10947,21498);(0,21498);(0,3404);(10213,3404);(10213,0);(21498,0);(21498,9945);(10947,9945)posrelh0posrelv0pib
co 	co 
;:) 	;:) 
x 

Figure 5-2. A1 8020A PCB Assembly (cont) 
5-9 

8020A 
72982 
Erie Tech. Products Inc. Erie, Pennsylvania 
Table 5-4. Federal Supply Codes for Manufacturers 
01121 
Allen-Bradley Co. Milwaukee, Wisconsin 
02735 
RCA - Corp - Solid State Div. Sommerville. New Jersey 
09214 
G.E. Co. Semiconductor Products Dept. 
Power Semiconductor Products OPN Sec. Auburn, New York 
Phoenix. Arizona 
04713 	56289 
Motorola Inc. Semiconductor Sprague Electric Co. 
Products 	North Adams, Massachusetts 
05277 
Westinghouse Electric Corp. Semiconductor Div. Youngwood, Pennsylvania 
07910 
71400 Bussmann Mf9. 
Div. of McGraw-Edison Co. St. Louis. Missouri 
Teledyne Semiconductor 	Centrelab Electronics 
Formerly Continental Device Div. of Globe Union Inc. 
Hawthorne. California 	Milwaukee, Wisconsin 
71590 
73445 
Amperex Electronic Corp. Hicksville. LI, New York 
80031 
Electro-Midland Corp., Mepco Div. A North American Phillips Co. Morristown. New Jersey 
89536 
Fluke. John Mf9. Co., Inc. Seattle. Washington 
91506 Augat Inc. 
Attleboro, Massachusetts 
United Stales 
Table 5-5. Fluke Technical Service Centers (U.S. and Canada) 
Canada 
CALIFORNIA 	ILLINOIS 	NEW JERSEY 	ONTARIO 	
Burbank 	Rolling Meadows 	Clifton 	Mlsslssauga 	
Fluke Technical Center 	Fluke Technical Center Fluke Technical Center Allan Crawford Assoc. Ltd. 			
2020 N. Lincoln SI. 	1400 Hicks Road 	460 Colfax Ave. 	Fluke Technical Center 	
Zip: 91504 	Zip: 60008 	Zip: 07013 	6503 Northam Drive 	
Tel. (213) 849-4641 	Tel. (312) 398-5800 	Tel. (201) na·1339 	Zip: L4V lJ5 	
			Tel. (416) 678-1500 	
Table 5-6. Sales and Service Locations (International) 
Supplied and supported by Fluke (Nederland) B.V. P.O. Box 5053 Zevenheuvelenweg 53 Tilburg, Netherlands. 
EUROPE 
DENMARK 
'Tage Olsen A/S Ballerup Byveg 222 
DK-2750 Ballerup Tel. <OIl 2-6581 11 FINLAND 
-ov F indip A8 Teollisuustie 7 
AUSTRIA 	02700 Kauniainen 
"Walter Rekirsch Elektronische 	Helsinki, Finland 
Gerate GmbH & Co. Vertrieb KG Tel. (0801 502255 
	Uechtensteinstrasse 97/6 	- 
A·1090 Vienna, Austria Tel. 12221 347646·0 
BELGIUM 
·C. N. Rood SIA 
37 Place de Jamblinne de Meux B-1 040 Brussels. Belgium 
Tel. 102) 27352135 
CYPRUS 
Chris Radiovision Ltd. P.O. Box 1989 Nicosia, Cyprus 
Tel. 66121 
FRANCE 
.oM. B. Electronique S.A. 
Rue Fourney ZACde 8UC B. P. No. 31 
78530 BUC. France 
Tel. (01) 9563130 
GERMAN FED REPUBLIC 'Fluke (Deutschland I GmbH 
4-Dusseldorf Meineckestrasse 53 West Germany 
Tel. 211·450831 
'Fluke lOeutschlandl GmbH 8000 Munich 80 Vertriesburo Bayern Rosenheimer Strasse 139 West Germany 
Tel. 089-404061 

GREECE 
'" Hellenic Scientific Representations Ltd. 11 Vrassida Street Athens 612, Greece Tel. 10211 7792320 
ITALY 'Sistrel S.p.A. 
Via Giuseppe Armellini No. 39 00143 Rome. Italy 
Tel. 1061 5915551 
'Sistrel S.p.A. 
Via Timavo 66 
20099 Sesto S. Giovanni IMilanl Italy 
Tel. 102) 2476693 
5-10 

Table 5-6. Sales and Service locations (International) (cont) 
S020A 
NETHERLANDS ·C.N. Rood, B.V. 
Cort van der Lindenstraat 11·13 
Rijswijk ZH2280AA Netherlands 
Tel. (070) 996360 
NORWAY 
* Morgenstierne & Co. AlA Konghellegate 3 
P.O. Box 6688. Rodelokk a Oslo 5. Norway 
Tel. (02) 356110 
PORTUGAL 
* Equ ipamentos 
De laboratorio Ltda P.O. Box 1100 lisbon 1. Portugal Tel. (019) 976551 
SPAIN 
*Hispano Etectrcruca S.A. Pofigono Industrial Urtinsa Apartado de Correos 48 Alcorean (Madrid), Spain Tel. 09-341-6194108 
SWEDEN 
*Teleinstrument AS P.O. Box 490 5·162 Vallingby·4 Sweden 
Tel. (08) 380370 
SWITZERLAND 
"Tr aco Electronic AG Jenatschstrasse 1 
8002 Zurich. Switzerland Tel. (oil 2010711 
TURKEY 
Er krnan Electronik Aletler Necatibey Cad 92/2 Karakoyllstanbul 
Turkey 
Tel. 441546 
UNITED KINGDOM 
"F luke I nternational Corp. 
Colonial Way 
Watford Herts WD2 4TT, England Tel. (0923) 40511 
MIDDLE EAST 
EGYPT 
Lotus Engineering Organisation P.O. Box 1252 
Cairo. Egypt 
Tel. 71617 
IRAN 
*' rantronics Company Ltd. 
20 Salm Road. Roosevelt Ave. Tehran. Iran 
Tel. 828294 
ISRAEL 
"R.D.T. Electronics Engineering Ltd. 46. Sokolov Street 
Ramat Hasharon 47235. Israel -Technical Service Available Tel. 482311 
JORDAN 
Trading Be Agricultural Development Co. 
P.O. Box 567 
Amman .. Jordan 
Tel. 23052 
KUWAIT 
Tareq Company 
P.O. Box Safat 20506 Kuwait, Arabian Gulf Tel. 436100 
LEBANON Mabek 
p.o. 80x 11-3823 Beirut, lebanon Tel. 252631 
MOROCCO Mainvest 
Residence Moulay Ismail Bat.C 80u levard 
Moulay Slimane, Rabat. Morocco 
Tel. 276-64 
SAUDI ARABIA Electronic Equipment Marketing Est. 
P.O. Box 3750 Riyadh. Saudi Arabia Tel. 32700 
SYRIA 
Mabek Electron ics C/O Messers G. Ghazzi P.O. Box 4238 Damascus. Syria 
Customers in the following countries: Bulgaria, Czechoslovakia. Hungary, Poland. Romania, U.S.S_R. and Yugoslavia, contact: Amlest Associates Ltd., P.O. Box 55, Addlestone, Surrey, KT 15 lOU, England, Tel. (0932) 52121 
Supplied and supported by Fluke International Corporation 
P.o. Box 43210 
Mountlake Terrace. WA 98043 
ARGENTINA "Coasln S.A. 
Virrey del Pino 4071 Buenos Aires, Argentina Tel. 523185 
AUSTRALIA 
Elmeasco Instruments Pty. Ltd. P.O. Box 30 
Concord. N.S.W. 
Australia 2137 
Tel. CO2) 736-2888 
Etmeasco Instruments Prv. Ltd. P.O. Box 107 
Mt. Waverly. VIC 3149 Australia 
Tel. 233-4044 
BANGLADESH Kabir Brothers ltd. 
97 - Gulshan Ave .• Gulshan G.P.O. Box 693 
Dacca-12. Bangladesh 
Tel. 303104 
BOLIVIA 
Coasin Bolivia S.R.L. Casilla 7295 
La Paz. Bolivia 
Tel. 40962 
BRAZIL 
"Arotec S.A. Industrial e Comercio Av. Pacaembu 811 Sao Paulo S.P .• Brazil Tel. (671 2393 
Arotec S.A. 
Av. Rio Branco. 277 Grupe 1309 
Rio de Janeiro - R. J., Brazil 
5-11 

8020A 
Table 5-6. Sales and Service Locations (International) (cont) 
CHILE 
*Intronica Chile Ltda. 
Casilla 16228 
Manuel Monti 024-01. 0 Santiago 9, Chile 
Tel. 44940 
COLOMBIA Coasin Ltd a, 
Carrera 13. No. 37·37, Of. 407 Ap. Aereo 29583 
80gota os, Colombia 
Tel. 285-0230 
ECUADOR 
"Proteco Coasin CIA, Ltda. 
Edifica "Jerico" Ave. 12 de Octubre 
No. 2285 y Ave. Orellana (Ptanta Baja) 
Quito .. Ecuador 
Tel. 529-684 
HONG KONG 
"Gilman & Co., Ltd. 
P.O. Box 56 Hong Kong Tel. 794266 
ICELAND 
Krist jan O. Skagljord Ltd. P.O. Box 906 
Reykjavik, Iceland 
Tel. 24120 
INDIA 
*Hinditron Services Pvt. Ltd. 691 A.L. Jagmohandas Marg Bombay 400 006, India Tel. 365344 
.. H inditron Services Pvt. Ltd. 412 Raj Mahal Vilas Ex tn. Bangalore 560 006, India Tel. 33139 
INDONESIA 
·P.T. OWl Tunggal Jaya Sakti 
JAPAN 
Panetron Division Tokyo Electron Ltd. 1 Higashikata-machi Midori-ku 
Yokohama 226. Japan Tel. (045) 471·8811 
·John Fluke Mfg. Co., Inc. 1 Higashikata-machi Midori-ku 
Yokohama 226. Japan Tel. (045) 473·5425 
Tlx: 3823·666 FLUKJP J 
KENYA 
Adeom limited Inc. P.O. Box 30070 Nairobi, Kenya 
East Africa 
Tel. 331955 
KOREA 
.. Electro-Science Korea Co. 
C.P.O. Box 8446 
Rm. 1201 Bowon Bldg. 490 Chonqro-Blca Chongro-ku 
Seoul. Korea 
Tel. 261·7702 
MALAYSIA O'Connor's (Pte) Ltd. P.O. Box 1197 
Kota Kinabalu, Sabah East Malaysia 
Tel. 54082 
O'Connor's (Pte) Ltd. P.O. Box 91 
Petaling Jaya, Selangor West Malaysia 
Tel. 51563 
NIGERIA 
Motat Engineering Co., Ltd. P.O. Box 6369 
Lagos, Nigeria 
PAKISTAN 
Pak International Operations 505 Muhammadi House McLeod Road 
P.O. Box 5323 
Karachi, Pakistan 
Tel. 221127 
PERU 
* lmportaciones 
y Representaciones Electronicas S.A. 
Avda, Franklin D. Roosevelt 105 Lima 1, Peru 
Tel. 288650 
SINGAPORE "O'Connor's (Pte) ltd. 98 Pasir Panjang Road Singapore 5, Singapore Tel. 637944 
SOUTH AFRICA "Fluke S.A. (Pty) Ltd. 
P.O. Box 39791 Bramley 2018 
Republic of South Africa Tel. (011) 786·3170 
TAIWAN 
CCT Associates, Inc. P.O. Box 24209 Taipei, Taiwan Republic of China Tel. (02) 391·6894 
THAILAND Dynamic Supply Engineering R.O.P:" 
No. 56 Ekernai. Sukhumvit 63 Bankok 11. Thailand 
Tel. 914434 
MEXICO 
Sangga Suana Bldg., 1st Floor 	"C.J. Christensen S.A. de C.V. 
Jl Senen Raya 44, P.O. Box 4435 Instrumentos Electronicos 
Jakarta, Indonesia 	de Medicion 
Tel. 367390 	Melchor Ocampo 150·8 
Mexico 4, D.F., Mexico Tel. (905) 535-2258 
P.T. DWI Tunggal Java Sakti 
Jalan Sasakgantung 45 Bandung, Indonesia 
*Technical Service Available 
NEW ZEALAND 
"W & K McLean Ltd. 
P.D. Box 3097 Auckland, New Zealand Tel. 587·037 
URUGUAY 
Coasin Urugu~ya S.R.L. Cerrito 617~4 Piso Montevideo, Uruguay Tel. 917978 
VENEZUELA "Coasin C.A. 
APDO Postal 50939 Sabana Grande No. 1 Caracas 105, Venezuela Tel. 782·9109 

5-12 

S020A 
Section 6 Option & Accessory Information 
6-1. INTRODUCTION 
6-2. This section of the manual contains information concerning the accessories available for use with the ModelS020A Digital Multimeter (there are not options available at this time). Each accessory, as shown in Figure 6-1, is described in general terms under a separate major heading containing the accessory model number. The depth of detail is intended to give the prospective user and adequate first acquaintance with the features and capabilities of each accessory. Additional information, when necessary, is supplied with the accessory. 
6-3. DELUXE CARRYING CASE (C90) 
6-4. The C90 Deluxe Carrying Case is a pliable, vinyl, zipper-closed pouch that provides in-field-transport protection for the S020A. as well as convenient storage locations for test leads, operator's guide and other small accessories. A finger- or belt-loop is included on the case as a carrying convenience. 
6-5. TEMPERATURE PROBE (80T-150) 6-6. Introduction 
6-7. The SOT-150 Temperature Probe converts the instrument into a direct-reading (I mV dc/a) °C or OF thermometer. It is ideally suited for surface, ambient and liquid measurement, and lends itself easily to a wide range of design, troubleshooting and evaluation applications. A rugged, fast-responding probe-tip with a 350V dc standoff makes the SOT-I 50 one of the most versatile and easy-to-use temperature probes available. 
6-8. Specifications 
Range (OC/OF) (field selectable by internal jumpers): -50°C to + 150°C or -5So F to 302°F. 
Accuracy: ±loC (I.So F) from O°C to 100°C, decreasing linearly to ±3°C (5.4° F) at -50°C and +150°C. 
Resolution: 0.1" C on 200 m V range. Voltage Standoff: 350V dc or peak ac. 
Power: Internal disposable battery; 1,000 hours of continuous use. 
6-1 

S020A 

SOT-150 
~ 
80K-40 

Figure 6-1. Model 8020A Accessories 
6-2 

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80J-10 
Figure 6-1. Model 8020A Accessories (cont) 
S020A 
6-3 

8020A 
6-11. The Mode1801~00 extends the maximum 2A ac current measuring capability of the instrument up to a maximum of 600 amps. A clamp-on transformer designed into the probe allows measurements to be made without breaking the circuit under test. In use, the current carrying conductor being measured serves as the tranformer's primary, while the 801-600 serves as the secondary. Because of a high efficiency, quadrature type of winding, wire size and location of the cond uctor within the transformer jaws do not affect accuracy of the current measurement. 

6-9. CURRENT TRANSFORMER (SOI-600) 
6-10. Introduction 
6-12. Specifications 
Range: 2 to 600A ac. Accuracy: ±3%. 
Frequency Response: 30 Hz to I kHz. Division Ratio: 1000: I. 
Insulation: 5 kV. 
Maximum Conductor Size: 2-inch diameter. 
6-13. HIGH VOLTAGE PROBE (SOK-40) 
6-14. Introduction 
6-15. The Mode180K-40 extends the voltage measurement capability of the instrument up to 40 kV. Internally, the probe contains a special 1000: I resistive divider. Metal-film resistor with matched temperature coefficients comprise the divider, and provide the probe with its excellent accuracy and stability characteristics. Also, an unusually high input impedance (1000 MO) minimizes circuit loading, and thereby contributes to measurement accuracy. 
6-16. Specifications 
6-17. HIGH FREQUENCY PROBE (S1RF) 

Voltage Range: I kV to 40 kV de or peak ac, 28 kV rms ac. Input Resistance:IOOO MO. 
Division Ratio: 1000: I. 
Accuracy DC Overall Accuracy: 20 kV to 30 kV ±2% (calibrated at 25 kV). Upper Limit: Changes linearly from 2% at 30 kV to 4% at 40 kV. 
Lower limit: Changes linearly from 2% at 20 kV to 4% at 1 kV. 
Accuracy AC (Overall): ±5% at 60 Hz. 
6-18. Introduction 
6-19. The 81 RF Probe extends the frequency range of the instrument voltage measurements capability to include 100 kHz to 100 MHz inputs from 0.25 to 30V rms. It 
6-4 

S020A 
operates in conjunction with the 8020A dc voltage ranges, and provides adc output that is calibrated to be equivalent to the rms value of a sine wave input. 
6-20. Specifications 
Frequency Response: ±I dB from 100 kHz to 100 MHz. 
Extended Frequency Response: Useful for relative reading from 20 kHz to 250 MHz. Response: Responds to peak value of input; calibrated to read rms value of a sine wave. Voltage Range: 0.25 to 30V rms. 
Maximum DC Input: 350V dc. 
Input Impedance: 12 Mil shunted by 15 pF. 
6-21. HIGH FREQUENCY PROBE (82RF) 
6-22. Introduction 
6-23. The Model 82RF High Frequency Probe, Figure 6-1, allows measurements over a frequency range of 100 kHz to 500 MHz from 0.25 to 30V rms. It is designed to be used with voltmeters having an input impedance of 10 megohms ± 10%. It may be used with a voltmeter having an input impedance higher than 10 megohms provided the input is externally shunted to make the equivalent input impedance equal to 10 megohms. 
6-24. Circuitry within the 82RF consists of a capacitor-coupled rectifier circuit which responds to the peak value of the input waveform. The output is positive polaritydc which is calibrated to be equivalent to the rms value of a sine wave. 
6-25. Specifications 
Frequency Response: 3 dB from 100 kHz to 500 MHz. 
Extended Frequency Response: Useful for relative readings from 20 kHz to 700 MHz. Response: Responds to peak value of input; calibrated to read rms value of a sine wave. Voltage Range:' 0.25 to 30V rms. 
Maximum DC Input: 200V dc. 
Input Impedance: 2 Mil shunted by 4 pF. 
6-26. BATTERY ELIMINATOR (A81) 
6-27. The A81 Battery Eliminator converts the 8020A from battery to ac-line operation. It is available in a variety of line-power configurations, as shown in Table 6-1. When connected to the 8020A, it effectively removes and replaces the output of the 8020A's battery. 
WARNING 
DO NOT SUBSTITUTE A CALCULATOR TYPE BATTERY ELIMINATOR FOR THE A81. THESE UNITS DO NOT PROVIDE THE PROTECTION NECESSARY FOR COMMON MODE MEASUREMENTS UP TO 500V DC. ALWAYS USE THE MODEL A81 FOR AC-LlNE OPERATION. 
6-5 

8020A 
Table 6-1. A81 Model vs Input Power 
MODEL NO. 	INPUT POWER 	
A81-100 	100V ae ±10%, 48 to 62 Hz 	
A81-115 	115V ae ±10%, 48 to 62 Hz 	
A81-230-1 	230V ae ±10%, 48 to 62 Hz (U.S. type pltig) 	
A81-230 	230V ae ±10%, 48 to 62 Hz (European type plug) 	
6-2S. CURRENT SHUNT (SOJ-10) 6-29. Introduction 
6-30. The Model SOJ-IO Current Shunt extends the current measuring capability of your meter to 10 amps continuous (20 amps for periods not exceeding one minute) DC to 10 kHz at an accuracy of ±0.25% in excess of the voltmeter accuracy. 
6-31. Specifications Shunt: 10 amps at 100 mV. Accuracy (18°C to 28°C): 
DC to 10 kHz: 0.25%. 
10 kHz-100 kHz: Rising to I dB at 100 kHz typical. 
Temperature Coefficient: 0.005%/°C. Inductance: IS.3 nH in series w/O.Oln shunt. 
Overload: Up to one minute at 20A with a 1/4 duty cycle for recovery after currents between lOA and 20A. 
Connects to: 3/4 inch center banana jacks. Ccmnectors: 5-way binding posts (red and black). 

S020A 
Section 7 Schematic Diagrams 
FIGURE 
TABLE OF CONTENTS TITLE 
PAGE 
7-1. 	AI S020A PCB Assembly.................................. 7-3 
7-1 

8020A 
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t-lCTrE'&- occees OTHEIi!\NISE. sPE:CIf:I~D 

.... u. RESlS~~ v.t.l,.UES ARE It.! OHM'!.. «u, CAPA.C.I1O£ 'JAI.I.)ES AIZE l}.,j UF • 
us 
e II'. 2. 
7-2 

S020A 

Figure 7-1. A 1 8020A PCB Assembly 
7-3 

8020A 

Figure 7-1. A1 8020A PCB Assembly (coni) 

7-4 

S020A 
Appendix A Manual Change and Backdating Information 
INTRODUCTION 
This appendix contains information necessary to backdate the manual to conform with earlier pcb configurations. To identify the configuration of the pcb's used in your instrument. refer to the revision letter (marked in ink) on the component side of each pcb assembly. Table A-I defines the assembly revision levels documented in this manual. 
NEWER INSTRUMENTS 
As changes and improvements are made to the instrument, they are identified by incrementing the revision letter marked on the affected pcb assembly. These changes are documented on a supplemental change/ errata sheet which, when applicable, is inserted at the front of the manual. 
OLDER INSTRUMENTS 
To backdate this manual to conform with earlier assembly revision levels, perform the changes indicated in Table A-I. 
CHANGES 
There are no backdating changes at this printing. All pcb assemblies are documented at their original revision level. 
Table A-1. Manual Status and Backdating Information 
Ref 
	0, I 	Assembly 
Option 	Name 
No. 
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Fluke 	• To adapt manual to earlier rev configurations perform changes 
Part 	in desending order (by no.). ending with change under desired rev tetter 
No. 	_---- .. -- .... 1 	••••• 	- 
A·3 I 802DA PCB assembly 
x = The PCB revision levels documented In this manual . 

... These .. evision letter$ were neve, used in the instrument. -"" No revision letter on the PCB. 
A-1 

S020A 
LIMITED WARRANTY 
The JOHN FLUKE MFG. CO .. INC., warrants each voltmeter it manufactures to be free from defects in material and workmanship under normal use and service for the pertod of 2 years from date of purchase. This warranty extends only to the original purchaser. This warranty shall not apply 10 fuses. disposable batteries (eecnarqeabte type batteries are warranted for 9O-days), or any product or parts which have been subject 10 misuse. neqtect. accident or abnormal conditions of operations. 
ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSEOR USE SHALL. BE LIMITED TO A PERIOD OF TWENTY-FOUR MONTHS FROM THE DATE OF PURCHASE. THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER EXPRESS WARRANTIES. JOHN FLUKE MFG. CO., INC .. SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT. TORT. OR OTHERWISE. 
In the event offailureof aproduct covered by this warranty, John Fluke Mfg. Co.. Inc .. wit! repair and calibrateaninstrumentreturnedtoan authorized Service Facility within 2 years of the original purchase: provided the warrantor's examination discloses to its satisfaction that the product was defective. The warrantor may. at its option, replace the product in lieu of repair. With regard to any instrument returned within 2 years of the original purchase. said repairs or replacement will be made without charge. If the failure has been caused by misuse. neglect, accident or abnormal conditions of operations. repairs will be billed ata nominal cost. In such cese.aneeumatewnt besubmitted before work is started, if requested 
NOTE: Some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or consequential damages. so the above limitations or exclusion may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state 10 state. 
If any failure occurs, the following steps should be taken: 
1. Notify the JOHN FLUKE MFG. CO .. INC., or nearest Service facility, giving full details of the difficulty, and include the Model number. type number, and serial number. On receipt of this information, service data or shipping instructionswitl be forwarded to you 
2. On receipt of the shipping instructions. forward the instrument. transportation prepaid. Repairs will be made at the Service Facility and the instrument returned. transportation prepaid. 
SHIPPING TO MANUFACTURER FOR REPAIR OR ADJUSTMENT 
All shipments of JOHN flUKE MFG. CO .. INC .. instruments should be made via United Parcel Service or "Best Way" prepaid. The instrument should be shipped in the original packing carton; or if itisnotavailable, use any suitable container that is rigid and of adequate size. If a substitute container is used, the instrument should be wrapped in paper and surrounded with at least four inches of excelsior or similar shock-absorbing material. 
CLAIM FOR DAMAGE IN SHIPMENT TO ORtGlNALPURCHASER 
The instrument snoutd.be thoroughly inspected immediately upon original delivery to purchaser. All material in the container should be checked against the enclosed paCking list. The manufacturer will nat be responsible for shortages against the packing sheet unless notified immediately. If the instrument is damaged in any way. a claim should be filed with the carrier immediately. (Taobtainaquotation to repair shipment damage. contact the nearest Fluke Technical Center.) Final claim and negotiations with the carrier must becompteted bV the customer 
The JOHN FLUKE MFG. CO .. INC. will be happy to answer aU application or use questions, which will enhance your use of this instrument. Please address your requests or correspondence to: JOHN FLUKE MFG. CO., INC., P.O. BOX 43210. MOUNTLAKE TERRACE. WASHINGTON 98043. ATTEN: Sales Dept. For European Customers: Fluke (Nederland) B.V., Zevenheuveleoweg 53. Tilburg, The Netherlands . 
• For European customers, Air Freight prepaid. 

John Fluke Mfg. Co., Inc., SS P.O. Box 43210 ss Mountlake Terrace, Washington 98043 
Rev.3n9 
A-2