OT

[amplover]

Hi guys. If you send a 1K signal in the primary side of the of the OT and can pick it up on all the secondarys with a signal tracer and they all have around the same voltage readings between them. Would it be safe to say it,s good?


Thanks.

[Amp Kat]

Most Likely

That would most likely be a good analogy but at what voltage did you send the 1khz tone at. It is highly unlikely that the tranny could pass or couple the signal across if it was open but if it was shorted it may but at a much lower ratio. The test that's never failed me even though I've second guessed it at times is measure the primary windings across and if you get anything from 15 to 200 ohms and then almost exactly half from center tap to each side is good ! Every tranny I've measured that the ohms at center tap was half the tranny was also. I've seen opens where the meter just blinks real fast and I've seen shorts where one side was real low in ohms but never seen a bad one when the ohms jived.

KB

[MWJB]

Hi AmpKat,

Measuring the DCR is a "good enough" rule of thumb test in the absence of a signal genreator/variac.

Amplover, as you have a signal generator apply a 1K 0.5VAC signal to the secondaries. Now measure the voltage end to end at the primaries. Divide that voltage by your 0.5VAC, then square it, then multiply by secondary impedance. This will give you the primary impedacne in ohms.

[amplover]

Thank you guys. It worked out for me and it was a good one.


Robin.