Acq Problem: Phasejumps

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CBrehm
Posts: 3
Joined: Tue Jan 08, 2019 2:32 pm

Acq Problem: Phasejumps

Post by CBrehm » Wed Aug 21, 2019 3:16 pm

Hi everybody.

I am experiencing a strange problem in acquisition of data: I read out 1buffer of Fast AI1+2 and I see phasejumps of the signal at varying positions. I am not too much concerned, if the phase jumps would arrise at the same time/sampleposition but they are obviously random.

This problem does not occur at every acq, but one time every 1-15 trys.
Does somebody have an idea how to avoid this?
I already tried different settings for sample delay, trigger channel1/2; positive edge and so on. But I would like to understand this problem.

I did try Labview and C-code on the redpitaya, but no fortune so far.


In the image you see a phase jump right at the beginning occuring in both signals, and a second time only for the red line.

thanks for your help!
best regards
Christian


edit: frequency is 12kHz; dez64; using stempab 125-14
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CBrehm
Posts: 3
Joined: Tue Jan 08, 2019 2:32 pm

Re: Acq Problem: Phasejumps

Post by CBrehm » Thu Aug 22, 2019 12:43 pm

Thinking about it, the phase jumps are due to a loss of data, since there are no wicked jumps or else.

I also tried the Oszi code designed by marceluda: marceluda.github.io
were I see the same pictures:

I see a phase jump in both signals, propably when a new buffer is read.
What I worry is, when I only see a jump in one signal....
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