Create and Cal a Noise Figure Measurement

This example program creates a Noise Figure measurement, then calibrates the measurement.

You MUST change the ECal Identification strings (in Blue font).

Optional: Uncomment the following lines (in Blue font) to change these settings:

Noise Receiver = Noise Receiver to Std (VNA) Receiver
Cal Method = "Vector" to "Scalar"
Receiver Characterization Method = "NoiseSource" to "PowerMeter"

This VBScript program can be run as a macro in the VNA. To do this, copy the code into a text editor file such as Notepad and save on the VNA hard drive as NF.vbs. Learn how to setup and run the macro.

See the Noise figure commands.

See Other SCPI Example Programs

' This section gets the VNA application

' starts the scpi parser, and presets the VNA

windowNum = 1

channelNum = 1

set pna=CreateObject("AgilentPNA835x.Application")

set scpi = pna.ScpiStringParser

' Create noise figure measurement

scpi.Parse "SYST:FPR"

scpi.Parse "DISP:WIND ON"

scpi.Parse "CALC:CUST:DEF 'noiseFig', 'Noise Figure Cold Source', 'NF'"

scpi.Parse "DISP:WIND:TRAC:FEED 'noiseFig'"

scpi.Parse "CALC:PAR:SEL 'noiseFig'"

' Substitute appropriate Ecal identification strings here

tunerEcal = "N4691-60004 ECal 02821"

pullEcal = "N4691-60004 ECal 02297"

' configure channel

ConfigureChannel

ConfigureNoiseSettings

' perform calibration

SetupNoiseSource

SetupCalAttributes_Insertable

FinishCalibration

' ----- Support subroutines ------

' Configure noise channel

sub ConfigureChannel

scpi.Parse "SENS:FREQ:START 750MHz"

scpi.Parse "SENS:FREQ:STOP 5.0GHz"

scpi.Parse "SENS:SWEEP:POINTS 401"

scpi.Parse "SENS:BWID 1.0E3"

end sub

' Configure noise-specific channel settings

sub ConfigureNoiseSettings

scpi.Parse "SENS:NOIS:REC NOISe" 'Use noise receivers

' scpi.Parse "SENS:NOIS:REC NORM" 'Use std PNA receiver

scpi.Parse "SENS:NOIS:AVER:STAT ON" ' turn averaging ON

scpi.Parse "SENS:NOIS:AVER 40" ' noise averaging

scpi.Parse "SENS:NOIS:BWID 8MHz" ' noise bandwidth

scpi.Parse "SENS:NOIS:GAIN 30" ' gain of noise receiver

scpi.Parse "SENS:NOIS:TEMP:AMB 301" ' ambient temperature, in Kelvin

scpi.Parse "SENS:NOIS:IMP:COUN 5" ' number of tuner impedance states

scpi.Parse "SENS:NOIS:TUN:ID '" & tunerEcal & "'" ' set ID of tuner Ecal module

scpi.Parse "SENS:NOIS:TUN:INP 'B'" ' orientation of tuner input port

scpi.Parse "SENS:NOIS:TUN:OUTP 'A'" ' orientation of tuner output port

scpi.Parse "SENS:CORR:TCOL:USER:VAL 300" ' noise source cold temperature

end sub

sub SetupCalAttributes_Insertable

scpi.Parse "SENS:CORR:COLL:GUID:CONN:PORT1 'APC 3.5 female'"

scpi.Parse "SENS:CORR:COLL:GUID:CONN:PORT2 'APC 3.5 male'"

scpi.Parse "SENS:CORR:COLL:GUID:CKIT:PORT1 '" & pullEcal & "'" ' port 1 calkit

scpi.Parse "SENS:CORR:COLL:GUID:CKIT:PORT2 '" & pullEcal & "'" ' port 2 calkit

scpi.Parse "SENS:NOIS:SOUR:CONN 'APC 3.5 male'" ' noise source connector type

scpi.Parse "SENS:NOIS:SOUR:CKIT '" & pullEcal & "'" ' noise source calkit

scpi.Parse "SENS:NOISE:CAL:METHOD 'Vector'" ' cal method

' scpi.Parse "SENS:NOISE:CAL:METHOD 'Scalar'"

scpi.Parse "SENS:NOISE:CAL:RMEThod 'NoiseSource'" 'Receiver Characterization method

' scpi.Parse "SENS:NOISE:CAL:RMEThod 'PowerMeter'"

scpi.Parse "SENS:CORR:COLL:GUID:INIT"

end sub

sub SetupNoiseSource

' specify the ENR file for the noise source

enrfile = "C:\Program Files(x86)\Keysight\Network Analyzer\Noise\346C_MY44420454.enr"

scpi.Parse "SENS:NOIS:ENR:FILENAME '" & enrfile & "'"

' set noise source cold temperature

scpi.Parse "SENS:CORR:TCOLd:USER:VAL 301.1"

end sub

sub FinishCalibration

' Build the connection list and acquire the calibration

steps = scpi.Parse("SENS:CORR:COLL:GUID:STEPS?")

for i = 1 to steps

str = scpi.Parse("SENS:CORR:COLL:GUID:DESC? " & i)

msgbox str

scpi.Parse "SENS:CORR:COLL:GUID:ACQ STAN" & i

scpi.Parse "SENS:CORR:COLL:GUID:SAVE 0"

wscript.echo "Calibration complete"

end sub