Analog multichannel peculiar read problem with PCI-6014 - hardware problem

Hi all

I see some very special behaviors with a 6014 when I do a multi-channel analog playback.  I am revamping of existing code to a customer, which implies the passing of the traditional DAQ in the DAQmx.  Traditional DAQ does not use a system based on the tasks, my client was in the process of reading clocked by the software for only one channel at a time, depending on what signal was of interest to both.  (application is a series of tests on a control PCB who will interface with some hardware, checking the answers and tensions and others)

When I rewrote the application using DAQmx, I created a single task that contains all of the analog inputs of the map (AI0:15).  When I am interested in a particular signal, I indexed the channel since the reading chart data.  The strings that contain the actual data are 0, 1, 3, 4, 5, 6, 7, 13, 14 and 15.  All channels are NRSE.

One of the signals of interest lights AI7.

When I connect the AI7 signal with an oscilloscope, I read 2.5V - which is exactly what I expect to see.

When I read AI7 using MAX, I read 2.5V.

When I read AI7 by itself using a single channel DAQmx reading (i.e. 1 Samp 1Chan or 1Chan N Samp), I read 2.5V.

When I read AI7 simultaneously with all the channels that have a greater number of channel (i.e. AI8-15), I read 2.5V.

When I read AI7 simultaneously with any channel that carries a lower channel number (i.e. AI0-6), I read 2.34V.

?????

For example, if I read AI0:15, I read 2.34V on AI7.  If I read AI0:7, I read 2.34V.  If I read AI7:15, I read 2.5V.  If I read AI7:10, I read 2.5V.  If I read AI6:7, I read 2.34V.  And so on.  Any combination of playback channel which includes results AI0 AI1, AI2, AI3, AI4, AI5 or AI6 during a misreading on AI7.

All channels read because they are supposed to, no matter what channel is included in the job.  AI7 is the only one that illustrates this behavior.

I wrote code for the acquisition of data for 10 years now and I have never seen anything like this before. The behavior is consistent.  I am sure that it is a hardware problem with the Special Commission that I use.  That's the advice of my customer, I don't know when they bought it, but I think they have had for years.  I doubt that ever, it has been calibrated.

I guess it's more I'm curious than anything else - what on earth would cause this behavior?

I'll tell my client to replace the card, if really I just asked my own knowledge.


Tags: NI Hardware

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