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Siglent SDG6000X series 200-500 MHz AWG's

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Detlev:
Hi guys,

I had made measurements of the FM for HPW, and I noticed a very strange behavior of the SDG6022X.

Initial values:

Modulation: PM
Carrier: square wave 10MHz
Modulation: 1 degree
Modulation frequency: sine 100Hz
Level: 0dBm

See also attached photo of SDG6022X.

Situation: about 60 seconds after switching on channel 1, the spectrum changes and then stays that way. If I now switch on channel 2, the spectrum is normal again. That again for about 60 seconds. (Nothing is connected to channel 2)
This is independent of whether the channels are phase-locked or not.

I have attached two screenshots of the SA with the spectrum which is OK and then another spectrum which is weird after 60 seconds.
And I've tried attaching a video showing the behavior, but it doesn't work.

Does anyone have an explanation for this or is it an error in the modulation of the SDG6022X?

Have a nice day
Detlev

gf:
Is the modulation signal a square wave, too, or a sine wave?

Detlev:
I modulated with 100Hz sine (I just added it above)

tautech:
Looks like FFT analyser mode with Harmonics turned to ON in the AWG.

Detlev:

--- Quote from: tautech on April 18, 2023, 10:44:22 am ---Looks like FFT analyser mode with Harmonics turned to ON in the AWG.

--- End quote ---

I am not aware that I have changed something in the SDG6022X. Where can I find this?

Then another question, why after 60-65 seconds?

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