- Jan 1, 1970
A 1-volt reference is pretty useless for calibrating thermocouple
The most accurate and stable voltage reference that I know of is only
about 500-700uV, which is inconvenient in some ways, but worth working
with in some cases.
Hey, I can now generate ratios of AC voltages on my bench with a
digitally selected resolution of 0.01ppm. Happy happy, joy joy.
A current shunt bearing the dissipation of being used like a little
'crystal oven', will constantly drop the same voltage and that can be a
good, low reference for your probe calibration session.
Likely not for his needs.
The noise floor simply becomes too 'everpresent'. It's like the cosmic
background. You keep trying to fix your circuit, when your reference
choice was the problem the whole time.
Gotta chill it all and put it in a cage, and make the room a cage as
well. Maybe then.