PXI-5105 clipping voltage at ~19V

The PXI-5105 should be capable of measuring peak to peak voltages of 30 V. I have a set of 3, 9V batteries to give me a total of 27 volts across a resistor. The PXI clips this voltage around 19V however. I confirmed with a multimeter I have 27 volts. I have input impedance set to 1 Mohm.
Thanks for any help.
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Hi cuxcrider,
The 30 V max range on the 5105 is a peak-to-peak voltage, which means that the highest voltage it can measure with respect to ground (0 V) is +15 V, unless you apply a DC offset, which unfortunately cannot be done on the NI 5105. You will usually see the rail voltage a little higher than the specified value, but generally you should not operate in that region as you risk causing damage to the board and taking measurements out of spec. Hope this helps,
Daniel S.
National Instruments

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I would like you to read through these tutorials to understand the programming steps of NI-SCOPE and NI-DAQmx. After reading these links below you will be able to understand how to connect output from a readfunction to a graph or chart.
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Please help me to improve performance my application, see attachment, and sorry for my English.
So, my task is to fetch and peak detection all (eight) channels of PXI-5105 with 4M record and sample rate 4M with loop 1 sec...
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Attachments:
consumer-producer7.vi ‏44 KB

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Go to Solution.

Hello Bob,
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PXI-5105 clipping voltage at ~19V

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