My PXI-5401 was just calibrated, but Vpp is off 17%

Hi,
Using the FGEN-SFP software I specified a 4MHz 500mVp-p sine wave and set up the load impedance as >1M. When I scope directly on the output, I get a 582mVp-p signal. I tried this on another station to confirm and get a 542mVp-p signal. The scope is a LeCroy LC534A 1GHz model.
The spec on the device is +/-0.1dB which works out to 1.16%, or 494 to 506mVp-p at 0 offset.
This indicates a problem with the calibration to me. Is this a fair assessment? My setup is as simple as possible, do you see any error in my methodology?
Thanks.

Hi, bmaxton.
This issue may be associated with the cable that you are using. Try using a different cable. It is also possible that the PXI-5401 and/or scopes need to be re-calibrated. Confirm that the scopes are calibrated correctly by applying a known voltage.
What is your operating temperature? This could also affect the accuracy of your reading.
I hope you're having a great day!
Regards,
Sara Lewandroski
Applications Engineer | National Instruments
http://www.ni.com/support

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My PXI-5401 was just calibrated, but Vpp is off 17%

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