PXI-5105 rms accuracy

[bartvsc]

What is the accuracy of a rms value on a PXI-5105 ? The only specifications you get is the AC Amplitude Accuracy and the RMS noise.

[Efrain_G]

Hey bartvsc,

If you look at page 5 on the PXI/PCI-5105 Specifications Document:

http://www.ni.com/pdf/manuals/374403g.pdf

You will see that depending on the Vpk-pk and input impedance range you will get a different AC Amplitude Accuracy. You can get the RMS Accuracy value by calculating it from the AC amplitude accuracy.

[bartvsc]

How do you calculate the rms accuracy from the AC amplitude accuracy ?