Create an SMC Fixed Output Measurement with COM

This VBScript example creates a calibrated SMC fixed output measurement using a controlled LO. Then a single sweep is taken and data is retrieved.

Requirements:

If an external LO is used, it should be configured to match the LOName property of the mixer object.

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

option explicit

' Utility function

function ToString(complexDataArray)

dim dataAsString

dim point

for point = 0 to UBound(data)

dataAsString = dataAsString & "(" & data(point,0) & "," & data(point,1) & ") "

ToString = dataAsString

end function

dim app

set app = createobject("agilentpna835x.application")

app.preset

' Put the channel in hold (highly recommended)

app.ActiveChannel.Hold 1

' Delete the standard measurement

app.ActiveMeasurement.Delete

' Create an SC21 measurement

app.CreateCustomMeasurementEx 1, "Scalar Mixer/Converter","SC21"

' Set the number of points to 11

app.ActiveChannel.NumberOfPoints = 11

' Setup the mixer parameters for a swept LO, fixed output measurement

dim mixer

set mixer = app.ActiveMeasurement

mixer.InputStartFrequency = 200e6

mixer.InputStopFrequency = 700e6

mixer.LORangeMode(1) = 0 ' 0 = Swept mode

mixer.OutputFixedFrequency = 3.4e9

mixer.InputPower = -17

mixer.LOPower(1) = 10

'mixer.LOName(1) = "8360"

' The CALCULATE method calculates the LO frequency from the other parameters,

' It also applies ALL mixer parameters to the channel.

mixer.Calculate 3 ' Calculate the LO range

' Create an S11 in the same channel

app.CreateCustomMeasurementEx 1, "Scalar Mixer/Converter","S11"

dim S11Meas

set S11Meas = app.ActiveMeasurement

' Create an IPwr in the same channel

app.CreateCustomMeasurementEx 1, "Scalar Mixer/Converter","IPwr"

' Create an OPwr in the same channel

app.CreateCustomMeasurementEx 1, "Scalar Mixer/Converter","OPwr"

' Perform a single sweep synchronously.

app.ActiveChannel.Single 1

' Retrieve the SC21 data

dim data

'Get the calibrated values in polar format

data = mixer.GetData(1,3) ' 1 = naCorrectedData, 3 = naDataFormat_Polar

wscript.echo "SC21=" & ToString(data)

' Retrieve the S11 data

'Get the calibrated values in polar format

data = S11Meas.GetData(1,3) ' 3 = naDataFormat_Polar

wscript.echo "S11=" & ToString(data)