Val

@attila yes, the ADP is in standard mode and I have just updated to the lates waveform software and nothing changed. APD behavior in Matlab is extremely weird. In addition to having lost samples the output channel attempts to repeat the signal it just sent during a "buffer" time ( I add zeros to the end of the signal I send to allow the recording system to transfer the files). I have never seen Digilent 2 doing it. I sun exactly the same code and get different results with ADP and Digilent 2. See the picture attached - the red curve is what I send to the output channel. And I connect this output channel to one of the input Chanels and get the yellow curve.

I have a Discovery 2 and ADP3450. I have been using Discovery 2 with Matlab to send signals to two different systems (a trigger to an external recorder and a seismic source signal). I need those signals to be synchronized but when I checked the data I could see they were not (with a sampling rate of 1e4 it varied from 0 to 10 samples shift). So I run a simple test when I output these signals from 2 channels in AD and input them into 2 input channels (see photos). In theory you should get the same output as you send in. And this is true for Deigilent 2 (see picture below). But the same set up shows absolute rubbish for ADP and also Matlab gives me a "lost samples" warning. So I have two questions: 1) Do output channels run on separate clocks? If so can I record a trigger time for each channel (Matlab has only one trigger time stamp output from what I can tell) 2) Is my ADP broken or is Matlab programming for it different? Or is it designed in a different way? Any suggestions are much appreciated! Best,V

@attila I'm using Matlab 2023b with the Digilent add-in.

Hi @attila Thanks a lot for your response. What about Discovery 2? I never had "lost samples" with this device with the same settings. With ADP3450 even if use a slow sampling rate and a short record (say 1 s record with 1e4 sampling rate) I still get the same errors. With Discovery 2 a went up to 20 s and 2.5e4 sampling rate and never had any issues.

hi @c.brauer, have you figured it out? I run into similar problems and can't find a reasonable solution anywhere either. Thanks!

Hello, I am using a Digilent Discovery 2 and Matlab to send a signal (to an external seismic source) and a trigger (to an external seismic recorder) using 2 output channels. It is critical for my work that both signals are synchronized but from what I can see in my data they are not. I was trying to find in the manual if the two output channels have separate clocks/triggers but I can't find this information. So the question is do the two channels have independent clocks or am I missing something? And is there a way to synchronize them or at least to record the triggered time for both channels to add the correction later in the processing? I also have a Digilent Discovery Pro that I have not tried yet. Does it work the same way? Any help is much appreciated! Best, V