[time-nuts] cheap USB voltage sensor
djl at montana.com
Fri Jan 13 16:27:02 EST 2012
Right, Poul! And I've found, by lots of headbanging on walls,
GROUNDLOOPS!!!!! even at 12 bits...
> In message <20120113200200.14805.qmail at s421.sureserver.com>,
> ale?=" writes:
>>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
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> and follow the instructions there.
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
"If you don't know what it is, don't poke it."
Ghost in the Shell
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
Huson, MT, 59846
More information about the time-nuts