How to test CMRR with pxi4461?

I have a PXI-4461 and the sound and vibration toolkit.
How can I test the amplifier's CMRR(common mode rejection ratio)?

The problem is not measuring voltage, but how PXI-4461 to generate the right signal to test CMRR, Pls find the attached picture.
Thanks in advance!
Attachments:
æ°å»º ä½å¾å¾å.PNG ‏9 KB

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