Multifunction DAQ

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USB-6008 Measurment Accuracy?

Hi, I have a 2.0VDC signal run into this board with Pin 1= GND and Pin2=2VDC. When I perform a mesurement, I read out +.5VDC?? I'm running the sample application fro the NI-DAQ CD called ContAcq-IntClk.c.
 
Why is there ~1.5VDC offset?
 
rjmiller
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Hi RJ-
 
The problem you're seeing is discussed in this KB.  Basically, you are wiring your input in an RSE terminal configuration so you need to indicate that explicitly in your code with the DAQmxCreateAIVoltageChan function.
 
Thanks-
Tom W
National Instruments
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That'll do it - thanks Tom.

 

rjmiller

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Hi RJ-

Glad I could help- keep us posted if you run into any other problems.  Thanks a lot-

Tom W
National Instruments
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