voltage measurment always gives 10V

[dragondriver]

Hi all,

  I am using PCI6023E analogy input to measure voltage. We have two cards: one has been using for long time for voltage measurment but we no longer own that. Another one is exact the same model and brand new (though the model is old). I am using LV7 and traditional DAQ driver to measure the constant voltage froma  battery but it always gives me 10V while the battery only gives 2.5V. I find that if I set the high limit to 5V and it always gives me 5V doesn't matter what voltage source I connect it to. Is that anything wrong? I also try to connect the digital output pin to the analog input pin and trying to output 0 or 5V TTL signal, it again gives +10V.

[Henrik_Volkers]

How did you wire your sources?

How did you configure the DAQ?

[dragondriver]

The source is just a battery and I have the positive end connected to AO0 and have the negative connected to the AOGND. I am using traditional DAQ (set the range of voltage to -10 to 10), configure it as differentianl , NRSE and RSE but doesn't help the problem.

[crossrulz]

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@dragondriver wrote:

The source is just a battery and I have the positive end connected to AO0 and have the negative connected to the AOGND. I am using traditional DAQ (set the range of voltage to -10 to 10), configure it as differentianl , NRSE and RSE but doesn't help the problem.

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AO?!!!  I sure hope you mean AI.  AO is the Analog Output.  You should have the positive end going to AI0, negative going to AIGND, and configure AI0 as RSE.

[dragondriver]

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@crossrulz wrote:

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@dragondriver wrote:

The source is just a battery and I have the positive end connected to AO0 and have the negative connected to the AOGND. I am using traditional DAQ (set the range of voltage to -10 to 10), configure it as differentianl , NRSE and RSE but doesn't help the problem.

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AO?!!!  I sure hope you mean AI.  AO is the Analog Output.  You should have the positive end going to AI0, negative going to AIGND, and configure AI0 as RSE.

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Sorry, I mean AI0, it was a typo 😞