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msr-consulting / exscalabar_server

Repository for the EXSCALABAR server.
http://www.msrconsults.com/ukmet-gh/exscalabar
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PAS cell 4 microphone signal AI problem #131

Closed JustinLangridge closed 8 years ago

JustinLangridge commented 8 years ago

There looks to be an issue with digitization of the microphone signal for PAS cell 4 (currently labelled cell 5 in UI waveform plot).

Look at the time domain signal with the speaker on and you see a big offset. This shouldn't be there. We've tried digitizing input from other cells into this channel on the FPGA card and they show the same offset. Any thoughts?

JustinLangridge commented 8 years ago

Matt could it be that the coupling for the input on this channel is set to DC instead of AC coupling?

JustinLangridge commented 8 years ago

Looked at this from the hardware perspective today and don't think this is a hardware issue. PAS cell top boards that show no offset when digitised on other channels, have a DC offset when put through this AI channel.

datid commented 8 years ago

It was hardware / wiring / connector not in correctly - close this