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Re: Measuring Coupling Coefficients
From: bmack[SMTP:bmack-at-frontiernet-dot-net]
Sent: Thursday, November 27, 1997 10:34 AM
To: Tesla List
Subject: Re: Measuring Coupling Coefficients
Terry
I haven't tried this but...
Considering that k is not frequency dependant you should be
able to measure it at a much lower frequency (neglecting capacitive
coupling).
This makes the test equipment loading less important in the calculations.
step1)Measure the inductance of each coil independantly out of the TC
circuit.
I use a series resonance test w/external cap at some lower RF freq but
close
as possible to the working frequency.
step2) re-assemble TC
step3) set a high undistorted amplitude into a PURE RESISTIVE load of 50
ohms
and make note of this P-P value. Use the same frequency as the prevous
test.
step4) hookup the RF generator across the the primary, again at the same
frequency .
step5) Adjust the secondary Pure resistive load to reflect 50 ohms into the
primary. At this point it will have the same amplitude as prevously noted.
step6) k= sqrt(L2/L1)
--------------------
sqrt(R2/R1)
For high powered coils, a lower impedance match for the primary may be
required due to the smaller magnitizing inductance.
In this case a matching transformer could be constructed.
Comments anyone???
Jim McVey
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> Subject: Measuring Coupling Coefficients
> Date: Tuesday, November 25, 1997 11:17 PM
>
>
> From: terryf-at-verinet-dot-com[SMTP:terryf-at-verinet-dot-com]
> Sent: Tuesday, November 25, 1997 4:23 PM
> To: Tesla List
> Subject: 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?" > Very large edit< Terry"
>
>
>
>