NEITHER 9205 always returns the noise from rail to rail.

Hi all

I'm completely stumped on this one. I went through the procedure of implementation of the NI 9205 module in my project. Setting the channel to the appropriate type. Placed the node IO in my FPGA code, read and all I get is noise from rail to rail, that is, whatever the measurement range is, I'm getting noise across the range. I ran it as a measure of CSR, as a measure differential, differential with COM updated wrt my diet, differential with COM Earth and the mass of the chassis connected to my powersupply ground.

Rail to rail noise ringing bells for anyone?

I checked with an oscilloscope that the appropriate signal is seen on the pins in all the configurations above. I even unplugged and plugged a 3 v battery through the pines and still noise from rail to rail get.

Help!

HM, I used the 9205 before, but didn't have never seen something like this. I am more fan of data buffering in a FIFO, rather than reading a control value, but still, you shouldn't see this kind of securities for a reason that I don't see. I had problems with the modules where something is messed up and randomly, the signal will drop out then go back (in fact, I am about to send an or because it is still under warranty, but it's in a portable box, so I think that he may have had problems with shock or something of the sort). I wish I had a good answer for you, but you seem you know what you're doing, so it could be one of those cases where there is a hardware problem.  You have any other module HAVE you can share and see if those working in this niche? You can try it in a different location to maybe see there is a connection from bad backplane? You can also check if your local rep OR has a loan that they can indulge for a day, just to see if another 9205 works. Usually, these are the steps I take when I think that there may be a hardware problem. Unfortunately, except that I don't have a lot of input for you.

Tags: NI Software

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