Measuring Secondary Coils

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Measuring Secondary Coils
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Thu, 20 Aug 1998 23:16:48 -0500
• Approved: tesla-at-stic-dot-net

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From:  RWB355-at-aol-dot-com [SMTP:RWB355-at-aol-dot-com]
Sent:  Thursday, August 20, 1998 5:18 PM
To:  fwd
Subject:  Re:Measuring Secondary Coils

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From:  chris.swinson [SMTP:chris.swinson-at-zetnet.co.uk]
Sent:  Wednesday, August 19, 1998 7:44 AM
To:  Tesla List
Subject:  Secondary Frequency
<SNIP>

Hi Chris, all !!

Chris 

I hope you are not thinking of just "plugging" a capacitor and/or inductance
 meter across your secondary coil and then just reading what the meter tells
 you. That doesn�t work !! The measuring frequency of these meters is way too
 low to give an accurate reading of the inductance (capacitance) the coil has
 at "our" operating frequencies. Typical DMM�s run at about 200Hz better ones
 at 400Hz or 1000Hz. I don�t know, however, if there are RF "adjusted" meters
 that would be able to really measure the values correctly.

Otherwise, the only way I think you could do it properly, would be to connect
 a frequency gen and an O-scope to the coil via a Wheatstone bridge. That way
 you could find the frequency at which the coil resonates, but you would still
 have to calc the (unknown) inductance/ capacitance part of the bridge (read:
 your coil). So you would be back to square one.
 I suppose you stepped into the same bear trap I did and used wire length as a
 grounds for your calculations. And as many coilers have proven (and if you
 think about it is pretty logical, too) the 1/4 wave theory will sink you like
 a leaky submarine.

Regards and safe coiling,
Reinhard
 

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