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25V/70V Transformer identification

I have a large number of small line to voice transformers that came out of a very large municipal facility These are all from different manufacturers. Some are tapped to watts and some are different. I would like to re employ these on a current project which will require

70V units , but I do not know whether they are 25V or 70V transformers. Can anyone suggest an easy way to determine this? I have tried comparing them with known transformers, however resistance readings are too variable to determine anything concrete. Thanks, Lenny
Reply to
klem kedidelhopper
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The only way to know is to measure the turns ratio, if they are unmarked.

Turns ratio squared* low side impedance = the high side impedance. Then use the formulas I posted earlier to determine the wattage at 70.7 V.

Reply to
Michael A. Terrell

You got any kind of signal generator ? Feed ot woth that and measure voltage and it is a matter of simple math.

J
Reply to
jurb6006

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