SOURce<Ch>:...    Related Topics  

This subsystem controls the frequency and power of the internal signal source, configures and starts the source power calibration, and provides output port settings.

 

Command tree: SOURce<Ch>

:FREQuency

[:CW] | FIXed

:CONVersion

:ARBitrary

:IFRequency

:MIXer

:FUNDamental

:PFIXed

:GROup

:CLEar

:LPORt

:CLEar

:POWer

:ATTenuation

:CORRection(source power calibration commands)

[:LEVel|

[:IMMediate]

[:AMPLitude]

:OFFset

:SLOPe

:STARt

:STATe

:STOP

Note: The SOURce<Ch>:POWer... subsystem comprises port-specific and general settings. Port-specific settings are valid for the port specified by the numeric suffix <Pt> (...:POWER<Pt>:...). General settings are valid for all test ports of the analyzer; the port suffix is ignored. Refer to the description of the individual commands for more information.  

SOURce<Ch>:FREQuency<Pt>[:CW] <fixed frequency>
SOURce<Ch>:FREQuency<Pt>:FIXed <fixed frequency>

Defines the fixed (Continuous Wave, CW) frequency for all sweep types operating at fixed frequency (power sweep, time sweep, CW mode sweep). The two command forms SOUR:FREQ:CW and SOUR:FREQ:FIX are equivalent.

SOURce<Ch>:FREQuency<Pt>:CW|FIXed is equivalent to [SENSe<Ch>:]FREQuency:CW|FIXed. Source and receiver frequency are equal; the four commands overwrite each other. With option ZVA-K4, Frequency Conversion, independent offset frequencies can be defined for the source and receiver frequencies; see SOURce<Ch>:FREQuency<Pt>:CONVersion:ARBitrary:IFRequency and [SENSe<Ch>:]FREQuency:CONVersion:ARBitrary.

<Ch>

Channel number. If unspecified the numeric suffix is set to 1.

 

<Pt>

Test port number of the analyzer. This suffix is ignored because the selected frequency applies to all source ports used in the active channel.

 

<fixed_frequency>

Fixed stimulus and analyzer frequency.

Range [def. unit]

Depending on the instrument model [Hz]. The increment (parameters UP or DOWN) is 0.1 kHz.

*RST value

1 GHz

 

SCPI, Command Types

Confirmed, command or query

 

Example:

FUNC "XPOW:POW:A1"

Activate a power sweep and select the wave quantity a1 as measured parameter for channel and trace no. 1.

SOUR:FREQ:CW 100MHz

Set the CW frequency to 100 MHz.

 

 

SOURce<Ch>:FREQuency<Pt>:CONVersion:ARBitrary:IFRequency
<numerator>, <denominator>, <offset>, CW | FIXed | SWEep

Defines the port-specific source frequency for frequency-converting measurements. The source frequency is either a range (for frequency sweeps) or a CW frequency (for power, time and CW Mode sweeps).  

<Ch>

Channel number.

 

<Pt>

Test port number of the analyzer. Note that the source frequencies at ports 1/2 and at ports 3/4 must be the same.

 

<numerator>
<denominator>
<offset>

Parameters of the frequency formula. The source frequency fs is calculated according to
fs = <numerator>/<denominator>*fb. + <offset>
where fb represents the sweep range (for frequency sweeps, parameter SWEep). For power, time and CW Mode sweeps (parameters CW or FIXed), fb = 0.  

The conversion formula for fs is ZVR-compatible but differs from manual control where the ratio <numerator>/<denominator> also multiplies the <offset>. In manual control, the <offset> is defined as a product of a ratio of two integers times a multiple of 1 Hz.

Range [def. unit]

The converted frequency or frequency range must be within the analyzer's frequency range, depending on the instrument model [Hz]. In addition the following restrictions apply:
<numerator> – Values are rounded to positive or negative integer numbers; zero is not allowed [1]
<denominator> – Values are rounded to positive integer numbers [1]
<offset> – Values are rounded to (positive or negative) multiples of 1 Hz [Hz].

*RST value

The default frequency/frequency range corresponds to the sweep range or CW frequency of the analyzer, i.e.
<numerator> = <denominator> = 1
<offset> = 0 Hz

 

Sweep type Parameters

SWEep – A frequency sweep is active, the command defines a frequency range.
CW | FIXed – A power, time or CW Mode sweeps is active, the command defines a fixed frequency.

*RST value

SWEep

 

SCPI, Command Types

Device-specific, command or query

 

Example:

*RST; FREQ:STAR 1E+9; STOP 1.1E+9

Reset the analyzer (activating a frequency sweep) and set the sweep range between 1 GHz and 1.1 GHz.

SOUR:FREQ2:CONV:ARB:IFR  2, 1, 1E+9, SWE

Convert the source frequency at test port no. 2 to the range between 3 GHz and 3.2 GHz. The frequency setting is also valid for port 1.  

 

 

SOURce<Ch>:]FREQuency:CONVersion:MIXer:FUNDamental RF | LO

Selects the mixer input signal which is at the fundamental power (channel power, to be defined by means of SOURce<Ch>:POWer<Pt>:STARt, SOURce<Ch>:POWer<Pt>:STOP, SOURce<Ch>:POWer<Pt>[:LEVel][:IMMediate][:AMPlitude]).

<Ch>

Channel number.

 

Parameters

RF – mixer input signal
LO – local oscillator signal

*RST value

RF

 

SCPI, Command Types

Device-specific, command or query.

 

Example:

See SOURce<Ch>:FREQuency:CONVersion:MIXer:PFIXed

 

 

SOURce<Ch>:FREQuency:CONVersion:MIXer:PFIXed <fixed_power>

Defines a fixed power, to be assigned either to the RF or to the LO signal (the signal not addressed by SOURce<Ch>:]FREQuency:CONVersion:MIXer:FUDamental RF | LO).

<Ch>

Channel number.

 

<fixed_power>

Fixed power.

Range [def. unit]

–40 dBm to +10 dBm. The exact range depends on the analyzer model or external generator used; refer to the data sheet [dBm]. UP and DOWN increment/decrement the source power in 0.1-dB steps.  

*RST value

–25 dBm

 

SCPI, Command Types

Device-specific, command or query.

 

Example:

*RST; SOUR:FREQ:CONV:MIX:PFIX –10

Reset the analyzer and specify a fixed power of –10 dBm.

SOUR:FREQ:CONV:MIX:FUND LO

Assign the fundamental frequency to the LO signal. The fixed frequency is automatically assigned to the RF signal.  

 

 

SOURce<Ch>:GROup<group_no>  <log_port1>,<log_port2>

Defines a group of measured ports numbered <group_no> containing a continuous range of logical ports <log_port1> and <log_port2>.  

<Ch>

Channel number.

 

<group_no>

Port group number. If unspecified the analyzer automatically selects an unused port group number (existing port groups are not overwritten).

 

Range [def. unit]

Port groups must contain at least one logical port and must not overlap, so the maximum number of port groups for an n-port analyzer is n.   [–]

 

<log_port1>, <log_port2>

First and last logical port number in the port group. The port group contains all port with numbers between <log_port1> and <log_port2>. The command generates an error message if only one parameter is transferred. Both parameters must be omitted if the command is used as a query.

Range [def. unit]

1 to n where n is the number of ports of the analyzer. <log_port1> can be smaller than, equal to or larger than <log_port2>, however, a physical port cannot be assigned to several port groups. [–]

 

SCPI, Command Types

Device-specific, command or query

 

Example:

SOUR:GRO1 1,2; SOUR:GRO2 3,4

On a 4-port analyzer, arrange the logical ports no. 1 and 2 in port group 1, the logical ports no 3 and 4 in port group 2.

SOUR:GRO?

Query the port group no. 1. The response is 1,2.

SOUR:GRO:CLE ALL; SOUR:GRO1?

Dissolve all port group and repeat the query. The response is 1,4: the default port group no. 1 contains all ports.

 

SOURce<Ch>:GROup<group_no>:CLEar [ALL]

Dissolves a group of measured ports <group_no> or all port groups.  

<Ch>

Channel number.

 

<group_no>

Port group number. If unspecified the numeric suffix is set to 1.

 

Range [def. unit]

Range according to the current port groups (SOURce<Ch>:GROup<group_no>). If an undefined port group number is used, the analyzer generates an error message. Exception: Parameter ALL, see below.  [–]

Note: Port group no 1 is always present and can not be dissolved. After a *RST or after SOURce<Ch>:GROup<group_no>:CLEar ALL, port group no. 1 contains all ports of the analyzer.

 

ALL

If ALL is specified, all port groups are dissolved (exception: port group 1; see above); the <group_no> suffix is ignored. If ALL is omitted, only the specified port group is dissolved.

SCPI, Command Types

Device-specific, no query

 

Example:

See SOURce<Ch>:GROup<group_no>

 

 

SOURce<Ch>:LPORt<log_port>  <phys_port1>,<phys_port2>

Defines a balanced port numbered <log_port>, combining two physical ports <phys_port1> and <phys_port2>.

A balanced port configuration generally introduces a new set of mixed mode measured quantities. Therefore the traces must be redefined as a balanced port is created. The easiest way to avoid any inconsistencies is to delete all traces of the active channel before defining a balanced port. The analyzer displays an error message if SOURce<Ch>:LPORt<log_port> is used while the channel <Ch> still contains a trace with an S-parameter as a measured quantity.

<Ch>

Channel number.

 

<log_port>

Logical port number used to number balanced or physical ports. If unspecified the numeric suffix is set to 1.

 

Range [def. unit]

One balanced port requires two physical ports, so the maximum number of balanced ports for an n-port analyzer is n/2 (n even) or (n – 1)/2 (n odd). If the command is used as a query, then <log_port> can range up to n (no balanced ports, see example below).  [–]

 

<phys_port1>, <phys_port1>

Logical port number. The command has no effect if only one parameter is transferred. Both parameters must be omitted if the command is used as a query.

Range [def. unit]

1 to n where n is the number of ports of the analyzer. The port numbers must be different from each other. Moreover, a physical port cannot be assigned to several physical ports. [–]

 

SCPI, Command Types

Device-specific, command or query

 

Example:

*RST; CALC:PAR:DEL 'TRC1'

Reset the analyzer and delete the (default) trace for channel no. 1.

SOUR:LPOR1 1,2; SOUR:LPOR2 3,4

Assuming that the analyzer provides 4 test ports, combine the physical ports 1 and 2 to the logical port 1, the physical ports 3 and 4 to the logical port 2.

SOUR:LPOR1?

Query the physical ports assigned to logical port no. 1. The response is 1,2.

SOUR:LPOR:CLE ALL; :LPOR1?

Dissolve all logical ports and repeat the query. The response is 1: the logical port no. 1 is identical to the physical port no. 1.

 

 

SOURce<Ch>:LPORt<log_port>:CLEar [ALL]

Dissolves a balanced port numbered <log_port> or all balanced ports.  

<Ch>

Channel number.

 

<log_port>

Logical port number used to number balanced ports. If unspecified the numeric suffix is set to 1.

 

Range [def. unit]

Range according to the current port configuration (SOURce<Ch>:LPORt<log_port>). If an undefined balanced port number is used, the analyzer generates an error message. Exception: Parameter ALL, see below.  [–]

 

ALL

If ALL is specified, all balanced ports are dissolved; the <log_port> suffix is ignored. If ALL is omitted, only the specified balanced port is dissolved.

SCPI, Command Types

Device-specific, no query

 

Example:

See SOURce<Ch>:LPORt<log_port>