Re: Windings vs. Diameter - errors

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Just to follow up...

My new coil's "official numbers" are:

Diameter 3.000 inches (center to center of wire)  (Starrett #120A-6)
Wire diameter 0.0116 with insulation (Starrett #436-1)
985 turns (electronic counter during winding)
11.500 inches long (Starrett #120-12)
Lexan coil form with Envirotex coating.  Lexan end caps with none 
ferrous end terminals.

DC resistance (HP34401A) = 83.30 ohms

Medhurst inductance = 16.988mH
MandK inductance = 17.088mH
JAVATC (Ldc)= 17.155mH
B&K meter = 17.06mH
Elenco meter (LCR-1801 very trusted) = 17.40mH
Wavetek 37XR = 17.35mH
HP 33120A, 34401, TEK TDS312, Standard cap = 17.47mH

I'll go with the Elenco at 17.40mH since it is always right ;-))

http://drsstc.com/~sisg/files/SISG-coil/CoatedCoil.JPG

At 300kHz, I am getting in Rac of 196 ohms "in series" with the 83.3 
ohms of DC resistance for a total of 279 ohms.  MandK predicts 238 
ohms, but I am not sure if that is total resistance or just the AC 
part.  But there are a lot of error details with this measurement.

Cheers,

	Terry