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DIY Precision Reference for DVM Calibration

Started May 3, 2020 | Discussions thread
mawyatt2002
OP mawyatt2002 Contributing Member • Posts: 502
Re: connection to SI standard ?

Bernard,

Agree these are very nice parts, they are the references used in the HP/Agilent 34401A DVMs shown, but special selected versions. Initial accuracy isn't that good, but drift with temperature and time is exceptional.

I also have lower resolution Fluke 77 and 87, they all agree well. The HP & Agilent DVMs calibration is a complex process and not just adjusting a pot, the calibration coefficients are stored in NVMemory. Soon I may get these DVMs calibrated, then use the LM399 reference calibration so I'll have a secondary standard on hand.

Best,

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