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Jumping pulse waveform on MSO-X 3024A while adjusting

Question asked by Johann Glaser on Jun 13, 2017
Latest reply on Jul 8, 2017 by Johann Glaser

Hi!

 

The integrated waveform generator (license DSOX3WAVEGEN) on my MSO-X 3024A behaves strangely. When generating a "Pulse" waveform and adjusting the frequency or the pulse width, the generated signal wildly jumps around. I would expect that the waveform steadily follows while I'm turning the knob.

 

Please see the attached scope screenshot. I setup the waveform generator to a pulse signal with a frequency of 50 Hz and a pulse width of approx. 7ms. Then I connected a BNC cable from the generator output to channel 1 and set to infinite persistance mode. Then I decreased the pulse width to approx. 5ms. I also tried increasing and decreasing a bit with the fine pulse width adjustment.

 

While I was turning the knob, the pulse waveform often jumped around wildly as can be seen in the persistent waveform. When I stop turning the knob, the waveform stays steady and correct.

 

Pulse waveform

 

I saw this problem with firmware version 2.37 and still after an update to the newest version 2.42.

 

Does anybody else experience these problems?

 

Thanks

  Hansi

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