Re: [TCML] Disassebling a huge transformer

["Mark Olson" <kc5gym@xxxxxxx>]

This is good stuff.  I moved it to the "keepers" box.
Marko
kc5gym

(Thiis message may be deemed "inappropriate").

> garry neeley wrote:
> > How can I figure out the inductance besides using lcr meter?
> > Bamacoiler
> 
> 
> Use the "3 meter" technique..
> 
> First, get a handle on the reactance.. hook up a volt meter and ammeter 
> and feed AC through the coil.  Start with low voltage so that the 
> currents are reasonable.
> 
> 
> Put the unknown in series with a known resistance, magnitude 
> approximately equal to the reactance of the unknown. Apply voltage to 
> the series combination.
> 
> Measure the voltage across the resistor and across the unknown, and the 
> series combination.
> 
> Now, you can solve for the R and X of the unknown either with algebra or 
> graphically.
> 
> That is, Vcombination = Irms * sqrt(Rtotal^2 + X^2)
> You know Irms because it's Vknown/Rknown
> Rtotal = Rknown + Rx
> 
> Jim


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