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PXI-5105 clipping voltage at ~19V

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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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I guess I should add I am using the NI Scope front panel that came with the card, not something I wrote on my own.

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Solution
Accepted by topic author cuxcrider

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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