Re: Tesla Coil Blunders

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Parpp807-at-aol-dot-com>

In a message dated 3/28/01 6:14:21 PM Central Standard Time, tesla-at-pupman-dot-com 
writes:

<<  At the risk of sounding pedantic I don't think you can have "DC
 inductance". I think
 inductance is usually measured at something like one Khz. It is on my
 bridge anyway. Please feel
 free to flame away if I have got this wrong. I have found that the "fudge
 factor" on  the tuning
 of my big coil is about 10 per cent lower than the calculated figure, and
 also from measuring it
 using  Johns scope s.g and counter method.  It was a bit closer with the
 spectrum analyser,but
 still lower. When I get this 30" sphere  i should be able to run at full
 power without any
 breakout. I will check the res freq with the spectrum analyser and report 
back.
 
 cheers
 bob golding
  >>
Hi Bob, All,

I just read up on the little info I have on the operation of the LCR bridge. 
My B-K will measure at 1 kc for low inductances, and at 120 Hz for high 
inductance. That much is in the little instruction booklet for the bridge. 
Reading a little more, I learned that the measurement of L is done by reading 
the X sub L for the inductance at the applied frequency. Isn't this the AC 
resistance? 

Using the sig gen, freq counter and oscilloscope method, I have 
found Fr to be 10% lower than the Wheeler calculation.
The results from the frequency analyzer will be interesting.

Happy day,
Ralph Zekelman