Re: Tesla Coil Blunders

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

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

In a message dated 3/29/01 12:16:01 AM Eastern Standard Time, 
tesla-at-pupman-dot-com writes: 


>
> 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 



Hi Ralph, 
No, XL is not the AC resistance. XL is inductive reactance which causes phase 
shift. AC resistance is DC resistance plus resistance due to skin effect, 
plus resistance due to eddy currents, plus others which do not cause phase 
shift. It has the properties of regular resistance (it dissipates energy) 
except that it is frequency sensitive. R=fn(f). 
Hope this helps, 

Matt D.