Re: [TCML] Terry Filter Resistors

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Hey Terry,

piranha wrote:
> It's a 1000 ohm resistor in series with an inductor.  Feed it a sine 
> wave at various frequencies and measure the current and maybe even the 
> phase.  With two points you should know the inductance.  They don't 
> make multilayer wire wound resistors ;)
It was a long shot (but it could be done <grin>).

> One would have to drop on on the concrete to see about how it is wound 
> but probably about 50mH.
50mH is way too big for single layer which is "why" I could only imagine 
a multilayer design, but then, I was using copper and should have 
considered other alloys.

I think Shaun's call to Ohmite did the trick! For the spec'd 100W 1K 
resistor, Ohmite showed 197uH (the one I was measuring this same 
resistor with the 27XT at 1000X that value). When Gary confirmed the 
ridiculousness of the reading with his 1/2W carbon resistor measurement 
on the same meter, it was clear "then" that "this ain't the way to 
measure L on ww resistors". I of course (just my nature) had to try to 
figure out how it could be done and still get the R value (multilayer is 
the only way with copper wire). But with the use of Nichrome, a whole 
new universe emerged and "then" the single layer high R and low L makes 
perfect sense.

Take care,
Bart
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