Acq Problem: Phasejumps

Just about everything about Red Pitaya
Post Reply
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
You do not have the required permissions to view the files attached to this post.

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....
You do not have the required permissions to view the files attached to this post.

Post Reply
jadalnie klasyczne ekskluzywne meble wypoczynkowe do salonu ekskluzywne meble tapicerowane ekskluzywne meble do sypialni ekskluzywne meble włoskie

Who is online

Users browsing this forum: Google [Bot] and 34 guests