Re: Measuring Coupling Coefficients

• To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
• Subject: Re: Measuring Coupling Coefficients
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Fri, 28 Nov 1997 17:00:36 -0600
• Approved: tesla-at-stic-dot-net

From: 	Edward V. Phillips[SMTP:ed-at-alumni.caltech.edu]
Sent: 	Thursday, November 27, 1997 3:18 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re:  Measuring Coupling Coefficients

"Hi All,
        I have been playing with measuring coupling coefficients lately.  I
was just wondering if anyone has a relatively easy way to accurately measure
this elusive factor?"

	Sure!  Just pass several amperes from the power line (toaster
or electric iron) through the primary and measure the induced power
line voltage in the secondary.  The mutual impedance is equal to
the secondary voltage divided by the primary current.  From the
impedance you can calculate the mutual inductance and from that
and the measured (or calculated, by Wheeler's formula(s))   primary
and secondary inductances you can calculate k.

Ed

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