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Re: K Quiz Answer
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