Matthew Smith writes:

ri wrote:
Hi Group , all I am working with here is the High Voltage Transformer
itself . The rest of the microwave oven has been discarded as trash . I
need a transformer that has an output of 1,500 volts for use as a plate
transformer . I have several microwave transformers to test .
This brings me back to the question of testing the voltage . How is the
best way to check the voltage ? Thanks again .

There is a relatively safe way to calculate the secondary voltage - no
mains energisation required; it's just not too accurate as it takes no
account of losses.

Which are extremely high in a microwave oven transformer.

Got a DMM with a decent inductance range? You can get a ballpark
value thus:

Yeah, how many have that?

Zp=sqrt( (Rp^2) + (2 * PI * f * Lp)^2 );
Zs=sqrt( (Rs^2) + (2 * PI * f * Ls)^2 );
np/ns=sqrt(Zp/Zs);
Vp/Vs=np/ns;

Where f is your local line frequency.

That sounds like the hard way.

Just run it with 1/10th the input voltage as has already been suggested.

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