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<h2>Automatic Calibration &nbsp;&nbsp;
<a href="javascript:void(0);" onClick="var e; if (parseInt(navigator.appVersion)>=4){e=event;}  if (parseInt(navigator.appVersion) >=2 && typeof(PopupMenu_Invoke) == 'function') PopupMenu_Invoke(e,'','Calibration (general description)','Calibration.htm','Guided Calibration','../../MMI_Reference/Channel/Calibration/Guided_Calibration.htm');return false;" title="Related Topics"><img src="../../ss_btn_related_topics1.gif" border=0 height=17 width=82 alt="Related Topics"></a>


 </h2>

<p>A <span style="font-style: italic;"><I>Calibration Unit </I></span>is an integrated 
 solution for automatic system error calibration of vector network analyzers 
 of the R&amp;S ZVAB family. Rohde &amp; Schwarz provides different types 
 of calibration units:</p>

<ul type="disc" class="whs1">
	
	<li class=kadov-p-CList><p class=List>The 4-port calibration units 
 R&amp;S ZV-Z51 (order numbers 1164.0515.30 or 1164.0515.70 for models 
 equipped with 3.5 mm or type N sockets, respectively) are especially suited 
 for R&amp;S ZVB and R&amp;S ZVA vector network analyzers in the frequency 
 range up to 8 GHz. </p></li>
</ul>

<p class=Figure><img src="Calibration_unit.jpg" width="426px" height="269px" border="0" class="img_whs2"></p>

<ul type="disc" class="whs1">
	
	<li class=kadov-p-CList><p class=List>The calibration units R&amp;S 
 ZV-Z52 (order numbers 1164.0521.30 and 1164.0521.72 for models equipped 
 with 3.5 mm or type N sockets) are especially suited for R&amp;S ZVB and 
 R&amp;S ZVA vector network analyzers in the frequency range up to 18 GHz 
 (model 72, 2 ports) or up to 24 GHz (model 30, 4 ports). </p></li>
	
	<li class=kadov-p-CList><p class=List>The 8-port calibration unit (accessory 
 R&amp;S ZV-Z58, order number 1164.0638.78) are especially suited for R&amp;S 
 ZVT vector network analyzers. </p></li>
</ul>

<p class=Figure><img src="zv-z58.jpg" width="624px" height="169px" border="0" class="img_whs3"></p>

<p>The units contain calibration standards that are electronically switched 
 when a calibration is performed. The calibration kit data for the internal 
 standards are also stored in the calibration unit, so that the analyzer 
 can calculate the error terms and apply the calibration without any further 
 input. </p>

<ul type="disc" class="whs1">
	
	<li class=kadov-p-CList><p class=List><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a3" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Advantages 
 of automatic calibration</a><script type="text/javascript"
														language=JavaScript1.2><!--
kadovInitEffects('a3');
//--></script></p>
<div class="droptext" id="POPUP169631883" style="display: 'none'; " x-ss-type="dropdown">
 <p>Automatic calibration is generally faster and more secure than manual 
 calibration, because: </p>
 <ul type="disc" class="whs1">
  <li class=kadov-p-CList>
  <p class=List>There is no need to connect several 
 standards manually. The number of connections to be performed quickly 
 increases with the number of ports; see <span style="font-style: italic;"><I><a 
 HREF="Calibration_Types.htm#TOSM"
	id=a2
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">TOSM 
 Calibration</a>.</I></span></p></li>
  <li class=kadov-p-CList>
  <p class=List>Invalid calibrations due to operator 
 errors (e.g. wrong standards or improper connections) are almost excluded. 
 </p></li>
  <li class=kadov-p-CList>
  <p class=List>No need to handle calibration 
 kit data. </p></li>
  <li class=kadov-p-CList>
  <p class=List>The internal standards don't 
 wear out because they are switched electronically. </p></li>
 </ul>
</div></li>
	
	<li class=kadov-p-CList><p class=List><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a4" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Limitations</a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
kadovInitEffects('a4');
//--></script></p>
<div class="droptext" id="POPUP167637580" style="display: 'none'; " x-ss-type="dropdown">
 <p>Automatic calibration is less flexible than manual calibration:</p>
 <ul type="disc" class="whs1">
  <li class=kadov-p-CList>
  <p class=List>Only full one port or TOSM calibrations 
 can be performed automatically, see <a href="Automatic_Calibration.htm#Autokal_Calibration_Type"
										id=a18
										style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">overview 
 table</a>. 
 </p></li>
  <li class=kadov-p-CList>
  <p class=List>Only fixed groups of ports can 
 be calibrated, e.g. port 1 and 2, port 1, 2, and 3. This restriction does 
 not hold in remote control; see <span style="font-family: 'Courier New', monospace;"><a 
 HREF="../../SCPI_Reference/SENSe/SENSe_CORRection_COLLect.htm#AUTO"
	id=a19
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">[SENSe&lt;Ch&gt;:]</span><span 
 class=dropspot
	style="font-family: 'Courier New', monospace;">CORRection:COLLect:AUTO</span></a><span 
 class=dropspot>. </span></p></li>
 </ul>
</div></li>
</ul>

<p class=spaceshaded>&nbsp;</p>

<table x-use-null-cells cellspacing="0" class="whs4">
<col>
<col>

<tr valign="top" class="whs5">
<td class="whs6">
<p><img src="../../small_images/Caution.jpg" width="87px" height="76px" border="0" class="img_whs7"></td>
<td class="whs8">
<p class="whs9">Attention!</p>
<p class="whs10">Please observe the 
 safety instructions on the technical information provided with the calibration 
 unit to avoid any damage to the unit and the network analyzer. Safety-related 
 aspects of ZV-Z51/-Z52/-Z58 connection and operation are also reported 
 in the sections below. &nbsp;</p>
<p class=space>&nbsp;</td></tr>
</table>

<p class=spaceshaded>&nbsp;</p>

<ul type="disc" class="whs1">
	
	<li style="x-condition: OLH; /*begin!kadov{{*/ x-condition: OLH; /*}}end!kadov*/ "
		class=kadov-p-CList><p class=List
								style="x-condition: OLH;"><a href="Automatic_Calibration.htm#Connection_and_Installation"
															id=A5
															style="x-condition: OLH; position: relative;">Connecting 
 the calibration unit</a><script type="text/javascript"
													language=JavaScript1.2><!--
kadovInitEffects('A5');
//--></script></p></li>
	
	<li style="x-condition: OLH; /*begin!kadov{{*/ x-condition: OLH; /*}}end!kadov*/ "
		class=kadov-p-CList><p class=List
								style="x-condition: OLH;"><a href="Automatic_Calibration.htm#Performing_an_Automatic_Calibration"
															id=A6
															style="x-condition: OLH; position: relative;">Performing 
 an automatic calibration</a><script type="text/javascript"
														language=JavaScript1.2><!--
kadovInitEffects('A6');
//--></script> 
 </p></li>
</ul>


<hr align="center" width="50%" class="whs11">


<h3><a name=Connection_and_Installation></a>Connecting the Calibration 
 Units to the Network Analyzer</h3>

<p>The calibration units provide the following connectors: </p>

<ul type="disc" class="whs1">
	
	<li class=kadov-p-CList><p class=List><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a27" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Calibration 
 units R&amp;S ZV-Z51/-K52</a><script type="text/javascript"
															language=JavaScript1.2><!--
kadovInitEffects('a27');
//--></script></p>
<div class="droptext" id="POPUP173006056" style="display: 'none'; " x-ss-type="dropdown">
 <ul type="disc" class="whs1">
  <li class=kadov-p-CList>
  <p class=List>A USB type B connector at the 
 rear is used to power-supply and control the unit. A USB cable for connection 
 to the network analyzer is provided with the calibration unit. </p></li>
  <li class=kadov-p-CList>
  <p class=List>Two or four RF connectors numbered 
 1 to 4 are to be connected to the test ports 1 to 4 of the analyzer. The 
 connector type is either type N (f) or 3.5 mm (f) for all four connectors. 
 &nbsp;</p></li>
 </ul>
</div></li>
	
	<li class=kadov-p-CList><p class=List><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a28" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Calibration 
 units R&amp;S ZV-Z58</a><script type="text/javascript"
													language=JavaScript1.2><!--
kadovInitEffects('a28');
//--></script></p>
<div class="droptext" id="POPUP170920585" style="display: 'none'; " x-ss-type="dropdown">
 <ul type="disc" class="whs1">
  <li class=kadov-p-CList>
  <p class=List>A USB type B connector at the 
 front is used to control the unit. A USB cable for connection to the network 
 analyzer is provided with the calibration unit. </p></li>
  <li class=kadov-p-CList>
  <p class=List>The RF connectors numbered 1 
 to 8 are to be connected to the corresponding test ports of the analyzer. 
 The connector type is type N (f) for all connectors. &nbsp;</p></li>
 </ul>
</div></li>
</ul>

<p class="whs12">To connect the unit...</p>

<ol>
	
	<li style="font-weight: bold; /*begin!kadov{{*/ font-weight: normal; /*}}end!kadov*/ "
		class=kadov-p-CProcedure><p class=Procedure
									style="font-weight: normal;">Switch 
 on and start-up your network analyzer. </p></li>
	
	<li style="font-weight: bold; /*begin!kadov{{*/ font-weight: normal; /*}}end!kadov*/ "
		class=kadov-p-CProcedure><p class=Procedure
									style="font-weight: normal;">To protect 
 your equipment against ESD damage use the wrist strap and grounding cord 
 supplied with the instrument and connect yourself to the <a HREF="../../HW_Interfaces/Front_Panel_Connectors.htm#Ground_Connector"
															id=A7
															style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">GND</a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
kadovInitEffects('A7');
//--></script> 
 connector at the front panel. </p></li>
	
	<li style="font-weight: bold; /*begin!kadov{{*/ font-weight: normal; /*}}end!kadov*/ "
		class=kadov-p-CProcedure><p class=Procedure
									style="font-weight: normal;">Connect 
 the USB type A connector of the USB cable to any of the USB type A connectors 
 on the front or rear panel of the analyzer. Connect the USB type B connector 
 of the USB cable to the USB type B connector of the calibration unit. 
 You can also connect the unit before switching on the analyzer. </p></li>
	
	<li style="font-weight: bold; /*begin!kadov{{*/ font-weight: normal; /*}}end!kadov*/ "
		class=kadov-p-CProcedure><p class=Procedure
									style="font-weight: normal;">Wait until 
 the operating system has recognized and initialized the new hardware. 
 When the unit is connected for the first time, this may take longer than 
 in normal use. &nbsp;</p></li>
</ol>

<p>The unit is ready to be used, see <a href="Automatic_Calibration.htm#Performing_an_Automatic_Calibration"
										id=a23
										style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Performing 
 an automatic calibration</a><script type="text/javascript"
														language=JavaScript1.2><!--
kadovInitEffects('a23');
//--></script>. </p>

<p class=spaceshaded>&nbsp;</p>

<table x-use-null-cells cellspacing="0" class="whs4">
<col>
<col>

<tr valign="top" class="whs5">
<td class="whs6">
<p><img src="../../small_images/Caution.jpg" width="87px" height="76px" border="0" class="img_whs7"></td>
<td class="whs8">
<p class="whs9">Note: </p>
<ul type="disc" class="whs1">
	
	<li class=kadov-p-CList><p class=List>The calibration unit is intended 
 for direct connection to <span 
 style="x-condition: ZVA_only;">ZVA</span> network analyzers following 
 the procedure described above. You can also connect the unit before switching 
 on the analyzer. Do not connect the unit to other USB hosts, e.g. a PC, 
 or insert any USB hubs between the analyzer and the unit, as this may 
 cause damage to the unit or the host. </p></li>
	
	<li class=kadov-p-CList><p class=List>You can connect several calibration 
 units to the different USB ports of the analyzer. You can also connect 
 cal units and other devices (mouse, USB memory stick etc.) simultaneously. 
 </p></li>
	
	<li class=kadov-p-CList><p class=List>An unused calibration unit may 
 remain connected to the USB port while the network analyzer is performing 
 measurements. It must be disconnected during a firmware update. </p></li>
	
	<li class=kadov-p-CList><p class=List>It is safe to connect or disconnect 
 the calibration unit while the network analyzer is operating. Never connect 
 or disconnect the unit while data is being transferred between the analyzer 
 and the unit. Never connect the unit during a firmware update. </p></li>
</ul></td></tr>
</table>

<p class=spaceshaded>&nbsp;</p>

<hr align="center" width="50%" class="whs11">


<h3><a name=Performing_an_Automatic_Calibration></a>Performing an Automatic 
 Calibration</h3>

<p>After <a href="Automatic_Calibration.htm#Connection_and_Installation"
			id=A10
			style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">connection 
 and initialization</a><script type="text/javascript"
													language=JavaScript1.2><!--
kadovInitEffects('A10');
//--></script>, 
 you can use the calibration unit as follows: &nbsp;</p>

<ol>
	
	<li style="font-weight: bold; /*begin!kadov{{*/ font-weight: normal; /*}}end!kadov*/ "
		class=kadov-p-CProcedure><p class=Procedure
									style="font-weight: normal;">Connect 
 ports 1 through n (n = 1 to 8, depending on your analyzer and calibration 
 unit model and the number of ports to be calibrated) of the analyzer to 
 n arbitrary ports of the calibration unit. Terminate all unused ports 
 (no. n + 1 to 2, 4, or 8) with a 50 <span style="font-family: Symbol, serif;">W</span> 
 match. </p></li>
	
	<li style="font-weight: bold; /*begin!kadov{{*/ font-weight: normal; /*}}end!kadov*/ "
		class=kadov-p-CProcedure><p class=Procedure
									style="font-weight: normal;">Perform 
 the automatic calibration for the selected number of ports using the <span 
 style="font-style: italic;"><I><a HREF="../../MMI_Reference/System/Measurement_Wizard.htm"
								id=A11
								style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Measurement 
 Wizard</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('A11');
//--></script></I></span> 
 or the <span style="font-style: italic;"><I><a HREF="../../MMI_Reference/Channel/Calibration/Start_Cal.htm"
											id=A12
											style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Start 
 Calibration</a><script type="text/javascript"
											language=JavaScript1.2><!--
kadovInitEffects('A12');
//--></script></I></span> 
 menu.<span style="font-style: italic;"> <I></I></span></p></li>
	
	<li style="font-weight: bold; /*begin!kadov{{*/ font-weight: normal; /*}}end!kadov*/ "
		class=kadov-p-CProcedure><p class=Procedure
									style="font-weight: normal;">Remove 
 the test cables from the unit, connect your DUT instead and perform calibrated 
 measurements. </p></li>
</ol>

<p><img src="../../small_images/tip.jpg" x-maintain-ratio="TRUE" width="36px" height="37px" border="0" class="img_whs13">The assignment between the analyzer ports and the cal 
 unit ports is detected automatically. If auto-detection fails (e.g. because 
 of a high attenuation in the signal path), connect matching port numbers 
 and click <span style="font-style: italic;"><I>Default Port Assignment </I></span><span>at 
 the beginning of the calibration process</span>. </p>

<p class=Note><img src="../../small_images/note.jpg" x-maintain-ratio="TRUE" width="36px" height="37px" border="0" class="img_whs13"><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a21" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Accuracy 
 considerations</a><script type="text/javascript"
												language=JavaScript1.2><!--
kadovInitEffects('a21');
//--></script></p>

<div class="droptext" id="POPUP172234254" style="display: 'none'; " x-ss-type="dropdown">
 <p>To ensure an accurate calibration, please observe the following items: 
 </p>
 <ul type="disc" class="whs1">
  <li class=kadov-p-CList>
  <p class=List
								style="margin-left: 27px;">Unused ports 
 of the calibration unit must be terminated with a 50 <span style="font-family: Symbol, serif;">W</span> 
 match. </p></li>
  <li class=kadov-p-CList>
  <p class=List
								style="margin-left: 27px;">No adaptors 
 must be inserted between the calibration unit and the test ports. </p></li>
  <li class=kadov-p-CList>
  <p class=List
								style="margin-left: 27px;">After connecting 
 the unit to the USB port, allow for a sufficient warm-up time (see <span 
 style="font-style: italic;"><I>&quot;Specifications&quot;</I></span>) before 
 starting the calibration. </p></li>
  <li class=kadov-p-CList>
  <p class=List
								style="margin-left: 27px;">To ensure best 
 accuracy the analyzer automatically reduces the source power to –10 dBm. 
 If the test setup contains a large attenuation, deactivate <span style="font-style: italic;"><I>Automatic 
 Power Reduction for Calibration Unit</I></span> in the initial tab of the 
 <span style="font-style: italic;"><I><a HREF="../../MMI_Reference/System/System_Menu.htm#System_Configuration"
										id=a24
										style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">System 
 Config</a></I></span> 
 dialog and ensure an input power of –10 dBm at the ports of the calibration 
 unit (please also refer to the separate <span style="font-style: italic;"><I>&quot;Specifications&quot; 
 </I></span>document). &nbsp;</p></li>
  <li class=kadov-p-CList>
  <p class=List
								style="margin-left: 27px;">In manual control, 
 a 1-port calibration can be performed at port 1 or port 2, a 2-port calibration 
 at ports 1 and 2 etc; see tables below. To perform any calibrated measurement 
 using port 3 or 4, a 3- or 4-port calibration is required. </p></li>
  <li class=kadov-p-CList>
  <p class=List
								style="margin-left: 27px;">In remote control 
 mode, an arbitrary assignment between the analyzer and the calibration 
 unit ports is possible. This is important for the calibration of ports 
 3 and 4 with a 2-port unit R&amp;S ZV-Z52, var. 72. </p></li>
 </ul>
</div>
<p class=spaceshaded>&nbsp;</p>

<table x-use-null-cells cellspacing="0" class="whs4">
<col>
<col>

<tr valign="top" class="whs5">
<td class="whs6">
<p><img src="../../small_images/Caution.jpg" width="87px" height="76px" border="0" class="img_whs7"></td>
<td class="whs8">
<p class="whs9">Attention! </p>
<p class=Figure>The maximum RF input power of the calibration unit is beyond 
 the RF output power range of the analyzer, so there is no risk of damage 
 if the device is directly connected to the test ports. If you use an external 
 power amplifier, make sure that the maximum RF input power of the calibration 
 unit quoted in the data sheet is never exceeded. &nbsp;</p>
<p class=space>&nbsp;</td></tr>
</table>

<p class=spaceshaded>&nbsp;</p>

<p><a name=Autokal_Calibration_Type></a>The calibration type depends on 
 the number of ports: </p>

<table x-use-null-cells cellspacing="0" width="100%" class="whs14">
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<col class="whs15">
<col class="whs15">

<tr valign="top" class="whs5">
<td width="50%" class="whs16">
<p class=Tabcmu1>ZV-Z51/-Z52: Number of ports calibrated</td>
<td width="50%" class="whs17">
<p class=Tabcmu1>Calibration type</td></tr>

<tr valign="top" class="whs5">
<td width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">1 (port 1 or port 2)</td>
<td width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;"><a HREF="Calibration_Types.htm#Full_One_Port"
								id=A14
								style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Full 
 one port</a><script type="text/javascript"
										language=JavaScript1.2><!--
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//--></script></td></tr>

<tr valign="top" class="whs5">
<td width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">2 (ports 1 and 2)</td>
<td width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;"><a HREF="Calibration_Types.htm#TOSM"
								id=A15
								style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">TOSM</a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
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//--></script></td></tr>

<tr valign="top" class="whs5">
<td width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">3 (ports 1, 2, and 3 or ports 1, 2, and 4)</td>
<td width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;">TOSM</td></tr>

<tr valign="top" class="whs5">
<td width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">4 (ports 1, 2, 3, and 4)</td>
<td width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;">TOSM</td></tr>
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<p class=space>&nbsp;</p>

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<col class="whs15">
<col class="whs15">

<tr valign="top" class="whs5">
<td width="50%" class="whs16">
<p class=Tabcmu1>ZV-Z58: Number of ports calibrated</td>
<td width="50%" class="whs17">
<p class=Tabcmu1>Calibration type</td></tr>

<tr valign="top" class="whs5">
<td width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">1 (port 1 or port 2)</td>
<td width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;"><a href="Calibration_Types.htm#Full_One_Port"
								id=a29
								style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Full 
 one port</a><script type="text/javascript"
										language=JavaScript1.2><!--
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<tr valign="top" class="whs5">
<td width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">2 (ports 1 and 2)</td>
<td width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;"><a href="Calibration_Types.htm#TOSM"
								id=a30
								style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">TOSM</a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
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//--></script></td></tr>

<tr valign="top" class="whs5">
<td width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">3 (ports 1, 2, and 3 or ports 1, 2, and 4)</td>
<td width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;">TOSM</td></tr>

<tr valign="top" class="whs5">
<td colspan="1" rowspan="1" width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">4 (ports 1 to 4)</td>
<td colspan="1" rowspan="1" width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;">TOSM</td></tr>

<tr valign="top" class="whs5">
<td colspan="1" rowspan="1" width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">5 (ports 1 to 5)</td>
<td colspan="1" rowspan="1" width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;">TOSM</td></tr>

<tr valign="top" class="whs5">
<td colspan="1" rowspan="1" width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">6 (ports 1 to 6)</td>
<td colspan="1" rowspan="1" width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;">TOSM</td></tr>

<tr valign="top" class="whs5">
<td colspan="1" rowspan="1" width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">7 (ports 1 to 7 or ports 1 to 6 and port 8)</td>
<td colspan="1" rowspan="1" width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;">TOSM</td></tr>

<tr valign="top" class="whs5">
<td width="50%" class="whs18">
<p class=Tabcmu2
	style="font-size: 10pt;">8 (ports 1 to 8)</td>
<td width="50%" class="whs19">
<p class=Tabcmu2
	style="font-size: 10pt;">TOSM</td></tr>
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<p class=Dropdownline><img src="../../small_images/info_red.jpg" x-maintain-ratio="TRUE" width="32px" height="37px" border="0" class="img_whs20"><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a16" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Messages 
 during the calibration process</a><script type="text/javascript"
	language=JavaScript1.2><!--
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//--></script></p>

<div class="droptext" id="POPUP170123984" style="display: 'none'; " x-ss-type="dropdown">
 <p>The automatic calibration is started on clicking <span style="font-style: italic;"><I>Calibration 
 Unit </I></span>in the <span style="font-style: italic;"><I><a href="../../MMI_Reference/Channel/Calibration/Start_Cal.htm"
														id=a13
														style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Start 
 Calibration</a></I></span>menu. When the test port connectors in the <span style="font-style: italic;"><I><a 
 HREF="../../MMI_Reference/Channel/Mode/Channel_Mode.htm"
	id=a20
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Port 
 Configuration</a></I></span> 
 dialog do not fit to the connectors of the calibration unit, a warning 
 appears: </p>
 <p class=Figure><img src="Port_Connectors.jpg" width="329px" height="125px" border="0" class="img_whs21"></p>
 <p><span style="font-style: italic;"><I>OK </I></span><span>changes the connector 
 type assignment of the test ports and starts the calibration. The </span><span 
 style="font-style: italic;"><I>Calibration Unit </I></span><span>dialog shows 
 the parameters of the cal unit, port assignment, and the progress of the 
 calibration procedure. </span><span style="font-style: italic;"><I>&nbsp;</I></span></p>
 <p class=Figure><img src="Calibration_Unit_Dialog.jpg" width="482px" height="477px" border="0" class="img_whs22"></p>
 <p>In the dialog, you can: </p>
 <ul type="disc" class="whs1">
  <li class=kadov-p-CList>
  <p class=List><span style="font-style: italic;"><I>Select 
 Other Cal Unit </I></span><span>in case that several cal units are connected 
 to the analyzer. </span></p></li>
  <li class=kadov-p-CList>
  <p class=List><span style="font-style: italic;"><I>Detect 
 </I></span>the current port assignment between the analyzer and the connected 
 calibration unit </p></li>
  <li class=kadov-p-CList>
  <p class=List>Restore the <span style="font-style: italic;"><I>Default 
 Port Assignment </I></span>(connect port no. n of the analyzer to port no. 
 n of the cal unit). This is important if the automatic detection of the 
 port assignment fails. </p></li>
  <li class=kadov-p-CList>
  <p class=List><span style="font-style: italic;"><I>Start 
 </I></span>the necessary calibration sweeps. The calibration is started automatically 
 if automatic port detection is successful and the cal unit temperature 
 is within the validity range. </p></li>
  <li class=kadov-p-CList>
  <p class=List><span style="font-style: italic;"><I>Abort 
 </I></span><span>an ongoing calibration process.</span></p></li>
 </ul>
 <p>The <span style="font-style: italic;"><I>Calibration Unit</I></span> dialog 
 is closed automatically when all standards have been measured, the system 
 error correction data have been calculated, and the result is applied 
 to the active channel. The network analyzer is ready to perform calibrated 
 measurements. </p>
</div>
<p class=Linkline
	style="x-condition: OLH;"><img src="../../small_images/helpwoval3.gif" x-maintain-ratio="TRUE" width="42px" height="18px" border="0" class="img_whs23"> <span style="position: relative;"><a 
 HREF="../../Measurement_Examples/Optimization/Calibration.htm#Automatic_calibration"
	id=A17
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Performing 
 an automatic calibration</a><script type="text/javascript"
														language=JavaScript1.2><!--
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<table x-use-null-cells class="whs24">

<tr valign="top" class="whs5">
<td colspan="1" rowspan="1" width="24%" class="whs25">
<p class="whs12">Remote control:</td>
<td colspan="1" rowspan="1" width="76%" class="whs26">
<p class=List><span style="font-family: 'Courier New', monospace;"><a href="../../SCPI_Reference/SENSe/SENSe_CORRection_COLLect.htm#AUTO"
	id=a25
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">[SENSe&lt;Ch&gt;:]</span><span 
 class=dropspot
	style="font-family: 'Courier New', monospace;">CORRection:COLLect:AUTO</span></a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
kadovInitEffects('a25');
//--></script><span 
 class=dropspot> </span><span style="font-family: 'Courier New', monospace;"><a 
 href="../../SCPI_Reference/SENSe/SENSe_CORRection_COLLect.htm#AUTO_PORTs"
	id=a8
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ "><br>
[SENSe&lt;Ch&gt;:]</span><span class=dropspot
								style="font-family: 'Courier New', monospace;">CORRection:COLLect:AUTO:PORTs</a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
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//--></script> 
 <a HREF="../../SCPI_Reference/SENSe/SENSe_CORRection_COLLect.htm#AUTO_PORTs_CONNection"
	id=A32
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ "><br>
[SENSe&lt;Ch&gt;:]CORRection:COLLect:AUTO:PORTs:CONNection?</a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
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 class=dropspot> </span></td></tr>
</table>


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