NI 9205 analog incorrect values in multichannel mode

Hello everyone

I am actually measuring 10 battery cell voltages (which are connected in series) with a NI 9205 (slot 1) in a frame NOR cDAQ-9172.

The voltage of each cell is measured in differential mode with channels 0 through 7, 16 and 17. I have no connection to the NI 9205 COM Terminal.

The other modules in the chassis are NI 9217 (2 modules, slot 2 and 3), NI 9481 (4 locations) and NI 9401 (5 location).

In my LabView program, I put all the channels of the NI 9205 and NI 9217 modules in a single task, because a single task can function both for the measurement of analog input.

My problem is that some of the values measured by the module NOR 9205 do not correspond to reality. All of the tensions 10 cells is about 2.60 V (measured with DMM). But, for example, channel 2 shows 2.67. Some channels are right and others are not.

I tried to vary the frequency of sampling, but this does not really solve the problem.

For example:

Sample rate = 1000-online channel 2 = 2.72 V

Sample rate = 100-online channel 2 = 2.67 V

Sample rate = 10-online channel 2 = 2.67 V

Then I tried to put all strings in a single task and allow a task after another. And then it worked!

But data acquisition is so slow, when you create a single task for each channel and that's why I prefer the way with several channels in a single task.

I don't know if my wiring should consider all connections to the Earth!

Thanks for any help!

Concerning

Socki

Hey Patrick

Your index really helped out me of a jam.

I had to reduce the frequency of clock to convert my module to HAVE. Now, it works great!

Sampling rate is 20 and convert clock frequency is 200 (for 10 channels)

The vi from the following link shows how to change clock frequency convert it (Set convert Clock.vi):

http://digital.NI.com/public.nsf/WebSearch/42484E84DA98053686256D32006E0494?OpenDocument

For my module, I had also to choose and connect the "active devices" on the property node DAQmx-Timing.

Thank you!!

Concerning

Socki

Tags: NI Hardware

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