[volt-nuts] High precision calibration for the poor man
phk at phk.freebsd.dk
Wed Oct 20 22:50:59 UTC 2010
In message <email@example.com>, "Samuel DEMEULEMEEST
>I'm now looking for a very precise way to step-down the
>voltage (-70 µV) in order to achieve the rated accuracy needed to calibrate
>the meter. That accuracy doesn't need to be maintained for more than one
>or two minutes.
Have you tried simply grabbing one of the plugs with your hand to
change the temperature of the metal-metal thermoelectric effect ?
70 microvolt may require more than a warm hand, but the principle
can be trivially extended with more sensitive junctions.
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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