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DIY Precision Reference for DVM Calibration

Started May 3, 2020 | Discussions thread
Bernard Delley Senior Member • Posts: 2,041
connection to SI standard ?

This Zener Diode with a built in temperature controller makes a very nice key component in a precision regulated voltage supply. It comes with a voltage guaranteed to 2% accuracy. But, how do you calibrate it with respect to the fundamental standard, a derived SI unit ?

The two reputed voltmeters in your image provide such a connection. The small difference in their displayed voltage gives a hint at their present accuracy - provided nobody has tampered with the calibration trimmer in their internal reference to make them show a closer voltage reading.

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