RE: [TCML] Terry Filter Resistors

["Jim Mora" <wavetuner@xxxxxxxxx>]

Hello all,

Ok the thread has grown for awhile!. Does the Ohmite - 1 Kohm 100watt
digi-key call out make the filter an LRC or not? Let's contact Terry for his
input.

Why not take said resistor, a known capacitance, scope, and signal generator
and sweep for the resonate frequency and extract the inductive reactance?

I am trying to finish a control cabinet or I would love to play with this.
Jim Mora

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bartb
Sent: Thursday, January 29, 2009 7:39 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Terry Filter Resistors

Hi Ed, Gary,

WOW! I think your right. That sure puts a damper on my multi-layer 
technique! Would work in multilayer mode, but if a  1K 1/2W carbon is 
measuring 184mH, then yes, all bets are off and a good lesson learned 
with the 27XT (and maybe any LCR).

Excellent test Gary!
Take care,
Bart

Ed Phillips wrote:
> I also have a 27XT multimeter.  If I take a 1.0K Ohm, 1/2W carbon comp 
> resistor (i.e. NO significant inductance) and try to measure its 
> inductance with this meter, it reads 184mH.  I don't think so!
>
> Bottom line - don't try to measure inductance of resistors with this 
> meter!
>
> Regards, Gary Lau
> MA, USA"
>
>     Measuring any kind of coil with this type of meter is sort of a 
> gamble unless you know what you're doing - the measurement technique 
> is quite an indirect one.  Works OK with reasonable coil Q but not at 
> all suitable for measuring the inductance of a WW resistor.  To do 
> that I'd break one and try to figure out the number of turns and then 
> calculate it.  I don't think even a good impedance bridge would give 
> useful results.
>
> Ed
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