[Phys-L] Re: Digital Multi Meters (DMM)

[Ludwik Kowalski <kowalskil@MAIL.MONTCLAIR.EDU>]

On Sep 20, 2005, at 8:59 PM, Folkerts, Timothy J wrote:

> With 2000 samples/sec for 20 sec, this works out
> to 0.58/200 = 3D 0.0029.  This is the expected
> standard deviation for the means you calculated.
> Your means show a st dev of 0.0047, which is
> noticeably bigger than the results of the simulation,
> but in the same  ballpark.  The difference is
> probably not statistically significant.

Tim:
The difference is probably due to the fact that means from 200000
amperages (sampled every 0.1 ms for 20 s) also fluctuate slightly from
test to test. Collecting data (actually simulation data) for hours
(instead of 20 seconds) would probably bring the result closer to your
exact expectation. But I am not going to do this. Thanks for the
comment,

Ludwik Kowalski
Let the perfect not be the enemy of the good.
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