> Original poster: Ed Phillips <evp@xxxxxxxxxxx>
> I have never understood why saturation isn't a factor in using an
> ungapped variac in series with a load.
Ed, i think we speak about the case of using the variac as an
autotransformer, not as variable inductor.
> An easy check on the leakage impedance would
> be to short the two ends of the winding and run say about 1 amp (100
> watt bulb in series across 120V line) and measure the voltage drop
> between the brush and the shorted ends for different brush
> positions. Why don't you do that and publish the results here? Only
> a few minutes work.
imo it will be difficult to get an acceptable accuracy of the
measurements, as the resistance of the winding can be compared
with the leakage inductance impedance, and it`s worse - both these
values are very small. for example, i have only usual dmm - i haven`t
got a measuring bridge.
we have to make the measurement by comparing the voltages (as i
suggested before in the thread about my psu), but i need one more
variac for this.
-----
The solution to no primary hits lay in getting rid of the primary!
This is no joke either.
20-06-96 (c) Richard Hull, TCBOR