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Setting FM source, IVI vs. scpi

Question asked by ChuckGantz on Feb 7, 2014
While writing a program that needed to set the source for FM, Int1 or Ext1, initially when using IVI I noticed that I couldn't change the source. This was either in my program or in the Agilent Command Expert. Eventually I found that if the modulation was on, I could change the source, but if the modulation was off, I couldn't change the source.

I then ran the scpi command, such as ":FM1:SOUR INT1" to change the source, using the IO Libraries interactive control. For this direct IO it didn't matter what the state of the modulation was. Also, I could change the FM deviation whether the modulation was on or off.

Is this the expected behavior?