Create an SMC Embedded LO Measurement

This VB Script example creates a SC21 SMC measurement for a mixer with an Embedded LO.

To make an embedded LO measurement:

The following are the mixer settings:

The SCPI commands in this example are sent over a COM interface using the SCPIStringParser object. You do NOT need a GPIB connection to run this example.

This VBScript (*.vbs) program can be run as a macro in the PNA. To do this, copy the following code into a text editor file such as Notepad and save it on the PNA hard drive as SMC.vbs. Learn how to setup and run the macro.

Dim app

Dim scpi

' Create / Get the PNA application.

Set app = CreateObject("AgilentPNA835x.Application")

Set scpi = app.ScpiStringParser

scpi.Parse "SYSTem:PRESet"

' Create a Scalar Mixer Forward Measurement

'First, delete all measurements on the channel

scpi.Parse "CALC:PAR:DEL:ALL"

'Create a forward scalar mixer measurement and configure it in

'channel 1.  The first parameter is a unique

'identifying string (specified by the user) to allow subsequent

'commands to be directed at this specific measurement.

scpi.Parse "CALC:CUST:DEF 'My SC21', 'Scalar Mixer/Converter', 'SC21'"

'Setup the new measurement as the 2nd trace in the active window

scpi.Parse "DISP:WIND:TRAC2:FEED 'My SC21'"

'Make the new trace the active measurement

scpi.Parse "CALC:PAR:SEL 'My SC21'"


' Setup Stimulus - Points and IFBW are channel settings

scpi.Parse "SENS:SWEep:POINts 21"

scpi.Parse "SENS:BANDwidth 1e3"

'Perform single sweep


' Mixer settings

' Input settings (swept)


scpi.Parse "SENS:MIX:INPut:FREQ:STAR 3.6e9"

scpi.Parse "SENS:MIX:INPut:FREQ:STOP 3.9e9"

' LO1 settings (fixed)


scpi.Parse "SENS:MIX:LO1:FREQ:FIX 500e6"

scpi.Parse "SENS:MIX:LO1:NAME 'Not controlled'"

' Dual-stage -  LO2 settings (fixed)

' Uncomment these lines for dual stage mixer

'scpi.Parse "SENS:MIX:STAGE 2"


'scpi.Parse "SENS:MIX:LO2:FREQ:FIX 500e6"

'scpi.Parse "SENS:MIX:LO2:NAME 'Not controlled'"

' Output settings (calculated)


scpi.Parse "SENS:MIX:CALC Output"

scpi.Parse "SENS:MIX:APPLY"

' Changing the following default settings is usually not necessary

scpi.Parse "SENS:MIX:ELO:TUN:MODE BROadband"

scpi.Parse "SENS:MIX:ELO:TUN:IFBW 30e3"

scpi.Parse "SENS:MIX:ELO:TUN:INT 1"

scpi.Parse "SENS:MIX:ELO:TUN:ITER 5"

scpi.Parse "SENS:MIX:ELO:TUN:SPAN 3e6"

scpi.Parse "SENS:MIX:ELO:TUN:TOL 1"

' Enable embedded LO

scpi.Parse "SENS:MIX:ELO:STAT 1"

'Single sweep does the same as "Find Now"

'from the ELO dialog


'Perform Calibration here as usual

Last modified:


Added Find now


Edit for LO name (ZW)


New topic