The following Python example demonstrates how to perform a source modulation calibration to compensate the IQ data to achieve a flat frequency response in gain and phase at the reference plane..
Note: Traditional S-parameter calibration using Cal All... must be performed before performing a Source Modulation Calibration.
See the Modulation Distortion commands.
See Other SCPI Example Programs
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import pyvisa as visa import time # Custom Exception class for SCPI Errors class SCPIError(Exception): def __init__(self, ex, *args): super().__init__(args) self.ex = ex # Display the Error Messag def __str__(self): return f'SCPI errors found in the system: {self.ex}' # Helper function to check for errors def catchErr(): numErrors = session.query("SYST:ERR:COUN?") if int(numErrors) != 0: raise SCPIError(session.query("SYST:ERR?")) # Change this variable to the address of your instrument VISA_ADDRESS = 'TCPIP0::vna_name::hislip0' # Create a connection (session) to the instrument resourceManager = visa.ResourceManager() session = resourceManager.open_resource(VISA_ADDRESS) session.timeout = 10000 #Set timeout to 10 seconds # Command to preset the instrument and deletes the default trace, measurement, and window session.write("SYST:FPR") # Create Modulation Distortion PIn measurement session.write("disp:wind1:stat on") catchErr() session.write(f"CALC:MEAS:DEF 'PIn1:Modulation Distortion'") catchErr() session.write("DISP:MEAS1:FEED 1") catchErr() # Create flat top signal session.write("sour:mod:file:type flat") catchErr() session.write("sour:mod:file:sign:srat 200e6") catchErr() session.write("sour:mod:file:sign:span 100e6") catchErr() session.write("sour:mod:file:sign:span:pri 1") catchErr() session.write("sour:mod:file:sign:tone:numb 1001") catchErr() session.write("sour:mod:file:sign:tone:numb:pri 1") catchErr() session.write("sour:mod:file:save 'C:\\Users\\Public\\Documents\\Network Analyzer\\flat.mdx'") catchErr() # Configure Modulation Distortion Measurement to use flat top signal session.write("sens:DISTortion:MODulate:SOURce 'Port 1'") # Use built in XSB modulation of DDS Source catchErr() session.write("SOURce:MODulation:LOAD 'C:\\Users\\Public\\Documents\\Network Analyzer\\flat.mdx'") catchErr() session.write("SOUR:MOD:STAT ON") catchErr() # Calibrate flattop signal using input reference receiver session.write("SOUR:MOD:CORR:COLL:POW:REC 'DUTIn1'") catchErr() session.write("SOUR:MOD:CORR:COLL:POW:ENAB ON") catchErr() session.write("SOUR:MOD:CORR:COLL:FLAT:ENAB ON") catchErr() session.write("SOUR:MOD:CORR:COLL:ACQ ASYN") catchErr() session.write("*OPC") catchErr() res = int(session.query("*STB?")) # Poll until the calibration is complete while (res == 0): res = int(session.query("*STB?")) time.sleep(0.1) # Only check every 100 ms # Turn on correction session.write("SOUR:MOD:CORR:STAT ON") catchErr() # Output detailed status of the correction print(session.query("SOUR:MOD:CORR:COLL:ACQ:DET?")) |