```Subject:  Re: K Quiz Answer
Date:  Mon, 2 Jun 1997 20:33:30 -0600
From:  "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
To:   tesla-at-poodle.pupman-dot-com>, "Tesla List" <tesla-at-pupman-dot-com>

To: Rich & Mark

MCM Electronics, Centerville, OH, carries a real fine LCR meter for
around
\$150.00  We have used it for about 6 years now and it takes very
accurate
measurements.  Every year or so we run it thru the calibration lab at
UW-Madison to keep its accurary verified.

----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-poodle.pupman-dot-com
> Subject: Re: K Quiz Answer
> Date: Saturday,May 31,1997 12:58 PM
>
> Subject:   Re: K Quiz Answer
>   Date:    Sat, 31 May 1997 08:38:20 -0400 (EDT)
>   From:    richard hull <rhull-at-richmond.infi-dot-net>
>     To:    Tesla List <tesla-at-pupman-dot-com>
>
>
> snip
> >
> >Method 2:
> >        If you have an inductance meter, this is the method of choice.
> >Set
> >up your coil in the geometry you intend to use.   Connect up your
> >inductance
> >meter to the primary with the secondary in its proper position for
> >normal
> >operation.  Disconnect all leads to the secondary (including ground).
> >Measure the primary coil inductance with the secondary coil open
> >circuited,
> >and call it Lpso.  Next, short circuit the secondary windings using a
> >small
> >piece of wire extending from the top of the secondary to the bottom.
> >Again,
> >measure the primary coil inductance, and call it Lpss.  One can now
> >compute
> >the coupling coefficient k using the formula:
> >       k = SQRT [ 1.0 - (Lpss / Lpso) ]
> >where SQRT means take the square root.
> more judicious snips
>
> >Flame away!
> >Mark S. Rzeszotarski, Ph.D.
> >
> >
> Mark,
>
> Superb post of good usable data and equations!!  The method above is the
> one
> we have always used around the lab here. mainly becasue it is Q & D
> (quick
> and dirty).  It does require an LCR meter, but any advancing coiler will
> have one of these on hand.  All coilers should consider getting one if
> they
> don't own one already, even if it means no shoes for the children for a
> while!!
>
> Richard Hull, TCBOR

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