[time-nuts] cheap USB voltage sensor
phk at phk.freebsd.dk
Fri Jan 13 15:19:40 EST 2012
In message <20120113200200.14805.qmail at s421.sureserver.com>, "=?iso-8859-1?Q?be
>I have some and they work well. Here's a plot of voltage vs time
>on an AA battery, showing the 18 bit performance (1 LSB = 15 uV).
>Noise is generally +/-1 LSB.
Did you try to hold the battery in your hand while you did that ? :-)
Be aware that once you get to approx microvolt, you have to take
into account things like the temperature difference between plug and
socket because the thermoelectric effect kicks in.
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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