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Which 34970A/34907A/34908A grounds are isolated?

Question asked by blawry on Sep 22, 2016
Latest reply on Sep 23, 2016 by tomc

Given a 34970A with the following modules 34907A, 34908A, and 34907A with the following grounds: 34970A-earth, 34907A#1-digital, 34907A#1-DAC, 34908A-*LO, 34907A#2-digital, and 34907A#2-DAC, which of these grounds are isolated from each other?  I'm troubleshooting an issue with a strange voltage offset (VDC, 10V, 6.5 digits, 2-10PLC) measured through the 34908A that appeared when an ATE stand was rewired.  I suspect a ground loop but haven't found it.  Thanks.