HP/AGILENT 8561E Amplitude units configuration

[Leo_T]

Hello

I am using HP/AGILENT 8561E Spectrum Analayzer for Antenna measurements and need to use dBuV  amplitude units during this test .

I am using downloaded drivers from NI and all work fine. Last thing that I need is to config my Spectrum Analayzer for dBuV units but I don't find appropriate vi  drivers that do this, there is default dBm units only. Of course is possibility  to add relationship between dBuV and dBm and calculate this but I want to config my Spectrum analayzer. Could you please assist me?

Thanks in Advance

[DaSh]

Hello Leonid, 

I assume you are using the Agilent 856X Series Analyzer from our NI IDNet page, correct?

Which function are you using to configure the amplitude and how it is configured? Are you using a logarithm scale? 

Can you send a screenshot or your vi?

Looking at the Config Amplitude VI, it seems it configures as dbm, but you may change this subvi by changing one of the VISA write command.  

In general, the LabVIEW driver uses NI VISA functions to call the Agilent 856X SCPI commands. If you open each subvi, you will see that the VISA functions send commands to the instrument. You can find the commands on the Agilent Technologies 8560 E-Series  User Guide. 

Let me know if you have any questions. 

Regards

Dalia

[jamiva · Accepted solution]

Not sure how to do it with your downloaded driver from NI. But it is a very simple SCPI command. You can set the amplitude units this way:

[DaSh · Accepted solution]

Hello Leonid, 

Based on Jamiva's answer, you can modify the Agilent 856X Series.lvlib:Config Amplitude.vi and add the SCPI command to the VISA Write VI.

Let me know if you have any question

[Leo_T]

Hello Dalia

Yes, I am using Agilent 856X Series Analyzer drivers  from your NI IDNet page.

Screenshots are attached.

You can see how my SA is configured ( Log scale, dBm is default...)

Thanks for SA 8561 user guide. I will try to implement needed command  in vi.

[Leo_T]

Hi 

Thanks a lot for advising

[Leo_T]

OK

I am going to this solution

Thanks a Lot!