I'm reading a negative voltage from an analyzer and it should be positive.

I have a carbon dioxide analyzer connected to a SCB 36 board. I'm reading a negative voltage in the Measurement and Automation Wizard that I can't seem to troubleshoot. THe wires from the analyzer are connected in ACH2 and ACH10 with resistors bridging ACH2 and ACH10, as well as ACH10 and AIGND. This is a differential mode set up, right? I can't figure out what could be causing this problem.
Also, the negative reading does not scale when I change the reading on the analyzer. Our oxygen analyzer connected to the same board (ACH1 and ACH9) is set up exactly the same way and it's working fine. I'm thinking its a hardware problem but could be the DAQ channel, the analyzer, or the DAQ card (PCMCIA 6024E).
I'm planning on obtaining a voltmeter so that I can test the voltage from the analyzer but beyond that, could anyone give some troubleshooting tips?
Thank You,
Seung Yoo

Try measuring a truly floating source such as a 1.5V battery.
Is the analyzer's output floating or ground referenced? Is the polarity of the wires correct.
Try connecting the oxygen to the channel in question and see if results are as expected.
Good luck
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
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