Re: Wire-wound resistors as dummy test load

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Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Matt,

Normally inductance meters like to see fairly low resistance in the "coil" they
are measuring.  I bet the 200 ohms is fouling the meter's inductance curcuit
up.  I would not worry about the inductance measuremnts.

Cheers,

        Terry


At 02:17 AM 9/30/2002 -0400, you wrote: 
>
> I found 4 200-Ohm, 200-Watt wire wound resistors all the same brand, that I
> thought I would string together as an 800 Ohm, 800 Watt, test load for my TC
> power supply, while checking things such as PFC cap size, etc.  However, when
> I checked them with my meters, I got these readings:
>
> 1) 205 Ohms 339 uHy 
> 2) 206 Ohms 221 uHy 
> 3) 210 Ohms 225 uHy 
> 4) 208 Ohms 508 uHy 
>
> Physically, they all seem to be the same size, shape, and construction, but
> the variation in inductance seems unreasonable. Has anyone looked into the
> inductance of wire-wound resistors before? If so, is this reasonable? I know
> that at 60 Hz, this only amounts to about 0.1 to 0.2 Ohms inductive
> reactance, but it seems strange.
> TIA,
> Matt D.