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Re: Wet Coils & nanohenry measurement resolution

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Tesla list wrote:

> Original poster: "Scott Hanson by way of Terry Fritz <twftesla-at-qwest-dot-net>" 

> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Sunday, May 26, 2002 10:50 AM
> Subject: RE: Wet Coils
>>Original poster: "David Thomson by way of Terry Fritz

> <twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>
>>I left the wet towel on the coil all night.  This morning the

>>inductance is 4.59mH.  My estimate previously of the 10 to

>>90 nanohenry drift should have been 1 to 9 nanohenry. The

>>total drift after 10 hours with a wet towel is about

>>20 nanohenry.

> Dave -
> Specifically, what inductance measuring instrument are you using that
> provides nano-henry resolution? Aside from best-of-technology instruments
> like the HP (now Agilent) 4284A Precision LCR Meter (~$14,000), I know of
> very few instruments providing reliable resolution in the nano-henry range.

	It is common for instruments to supply digits beyond
	their specified accuracy.  These digits have their
	uses, however must be treated with extreme caution and