We got this 0 dBFS test result shown below from the combination of SoCKit + AD-FMCOMMS2 using ADI IIO oscilloscope tool.
Normally it would have a value.
We are wondering if anyone knows what's going on here.
Not sure what you are trying to show here.
Are you doing some loopback test?
Can you show a screenshot of your control plugin?
Make sure that when using signal source DDS that the scale is properly set.
We used to see something like this after the first steps.
This is one of few units that we've seen over hundreds boards. We are wondering if
I'm pretty sure that the setting is not the problem here because we always apply the same setting to each and every one of them.
It's a marker math bug (basically some unhanded case).
The marker don't handle proper frequency folding.
We'll fix this soon.
Thanks for pointing out.
Thanks for your reply. I'll take that as this issue is purely software related. They are physically good and working units.
Please feel free to correct me here.
Without knowing more - I can't state whether this assumption is right.
The spectrum looks quite different in the failing case. The Fundamental is found on the left (negative) side of the spectrum. And what I'm saying is that the marker math currently can't handle that properly. That's why you got the 0dBFS reading.
This issue got fixed last week with this commit:
If you are running the FMCOMMS2 test script here:
iio-oscilloscope/FMComms2_test.ini at master · analogdevicesinc/iio-oscilloscope · GitHub
I would always expect some peak at the fundamental. But your's look like the loopback cables are not connected.
What is it that you need to confirm our assumption ? Is there anything we can do to make sure these units are physically functional ?
We are pretty sure the loopback cables are connected and secured.
Does that same unit always fail the test? While others always pass?
Then there is for sure something wrong with it.
The same unit always shows the result like this, but others always don't. We are supposed to see some values other than 0 in the instruction given.
We currently have approximately 4% with this zero value shown.
Remote debugging doesn't really work with these things.
To determine what's really going on requires some system knowledge.
I would consult your subject matter expert on these cards.
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