I have another 34401A doing the same thing, plus failing "AC" certification (which I never use these meters for).
I just ordered another BT05-2A66 from Mouser to fix this one. I do not know if that will have anything to do with passing "AC" or not, but if it passes everything else with the ISO17025 certification, I can live with a limited calibration on this one.
If the "AC" is not the relay, and it was just a little out of spec, cannot someone re-calibrated the A/C measeurments with software?
Dave