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Seeking Advice on DIY Calibration for 34401A Multimeter
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alm:
To me the Rigol is more likely to drift, particularly if it's fairly new, since Rigol and Siglent don't do the burn in and selection of their references that the established brands do. So I'd agree with sending out the 34401A rather than the Rigol. It will likely also be easier to find a lab that will calibrate the 34401A than the Rigol since it's a very popular meter and calibration and adjustment procedures are well published.

I would be very hesitant to do any adjustments at home unless you are confident you are going to improve the accuracy. This generally requires a reference that is better (not just equally good) as the meter. So for DCV you'd need a reference that is much better than 35 ppm. Otherwise you are more likely to make the situation worse than better.

I have done calibrations with very limited means like function generators and power supplies, but not adjustments except in the one case the DMM was way off: always reading 0V in a particular ACV range, which I did adjust with the max 7 Vrms my function generator would output on the 30V range.
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