All three VBScript examples in this topic create a FOM measurement with the following attributes:
Sweep the Source (input) from 1 GHz to 2 GHz
Sweep the Receivers (output) from 2 GHz to 3 GHz
You provide an LO at 1 GHz
Learn more about Frequency Offset Mode
These programs 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 FOM.vbs. Learn how to setup and run the macro.
The following example will run on any VNA model with FOM (opt S93080A). However, these commands have no provisions for internal second source. It uses commands introduced before 'enhanced FOM' was released for the A.07.10 release.
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set app = CreateObject("Agilentpna835x.application") set chan = app.ActiveChannel chan.startFrequency = 1e9 chan.StopFrequency = 2e9 ' set the receiver frequencies to be 2e9->3e9 chan.FrequencyOffsetFrequency = 1e9 chan.FrequencyOffsetState = 1 |
The following example can be run ONLY on a VNA with revision A.07.10 or later and has FOM (opt S93080A). It uses new FOM commands. See FOMRange object.
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set app = CreateObject("Agilentpna835x.application") set chan = app.ActiveChannel chan.startFrequency = 1e9 chan.StopFrequency = 2e9 ' set the receiver frequencies to be 2e9->3e9 chan.fom("Receivers").Offset = 1e9 chan.fom.State = 1 |
The following example can be run ONLY on a VNA with a second internal source, has revision A.07.10 or later, and has FOM (opt S93080A). It uses the internal 2nd source for the fixed LO frequency.
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set app = CreateObject("Agilentpna835x.application") set chan = app.ActiveChannel chan.startFrequency = 1e9 chan.StopFrequency = 2e9 ' set the receiver frequencies to be 2e9->3e9 chan.fom("Receivers").Offset = 1e9 chan.fom("Source2").Coupled = 0 chan.fom("Source2").StartFrequency = 1e9 chan.fom("Source2").StopFrequency = 1e9 ' turn off port coupling chan.coupleports = 0 ' set LO to 10 dBm chan.TestPortPower(3) = 10 'Turn ON port 3, our LO signal on our 2 source PNA chan.SourcePortMode(3) = 1 chan.fom.State = 1 |