When I acquire data on one channel, I get different values. PCI-6031E.

[Michael_M.]

I'm using PCI-6031E, SCB-100 terminal board.  When I acquire voltage on some channels, I get different levels each time, sometimes I do get the right value.  The same happens when I read the levels in measurement explorer.  I'm using measurement studio with visual basic 6, Windows 2000 SP6.

I do this using AI single point, channels 0 to 55, RSE.  The same PC has 2 PCI-4472 DSP boards with no problem there.

When I start the program, I have

CWAIPoint1.Device=6

CWAIPoint1.Reset

Then I acquire the measurements.

When I close the program, I tried doing this

CWAIPoint1.Reset,

Again it did not work right (90%) of the time.

[PBear]

Hi Michael,

Can you give a little more detail about the different levels? If a known voltage to a channel is being read outside the accuracy specification in the NI 6030E/6031E/6032E/6033E Family Specifications (page 5) for a given range then you may have a connection issue that can be resolved in the Field Wiring and Noise Considerations document.

There could be many causes to get "wrong" data and more information about your situation could shed some light. Also, please keep in mind that the DSA cards you have are a very different architecture than the E-series boards. The E-series boards multiplex all signals through one ADC whereas the DSA boards have dedicated Sigma-Delta ADCs for each channel with built in anti-aliasing rejection.