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Re: AC Voltage Calibrator, home built

 

Great document!

I don't like the idea of taking a thermocouple from a working Q Meter however. An alternative would be taking one from a World War surplus RDF Ammeter.

Back in the '60's, we were calibrating differential voltmeters with AC 0.1% spec using an HP signal generator into a McIntosh audio amp into the secondary of an audio output transformer to generate high voltage, and measuring it with a Holt thermal transfer to compare with our Cohu 321 DC standard.

John

On 8/14/2022 12:16 PM, Jacques Audet wrote:
Hello all,
You may have a look at my document on:? Calibration Techniques for the Home Lab

I have had good results with a full wave rectifier using 0.1% resistors, as shown on page 25.
Using a thermocouple will provide even better accuracy, provided you use 6.5 digit DC voltmeters.? Starting at page 30.
That gives me a precise 1.000 VAC reference which allows verification of my multimeters.
A stable AC source driving an amplifier with? Kelvin Divider allows for checking at voltages up to 200VAC.
Jacques? VE2AZX
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