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# How to test a transformer

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#### gaga2410

##### Junior Member level 2
Hi everybody,

I've searched the web for testing a transformer. I 've found some help but not very satisfy.

I have a lot of transformer that I take from some crash materials.
The code inside don't help.

I would like to use them for my projects.

So, if anyone know how to approximate the current and voltage, it was very useful for me !!!

Thank you very much for your help

Turns ratio (voltage ratio primary to secondary) can be calculated pretty easily by applying a sinewave to one winding and measuring the amplitude on another winding..

hi, I think
You can use VOM , choose mode Ohm metter to test your transformer! The impedance input of it is large, and the impedance output of it is small.
if it's is not right , the transformer maybe corroupted

Points: 2
How can you test the maximum current and the voltage to the secondary wind of a transform? I also have a few transformers from crashed devices but i cannot use them because of their unknown characteristics. Can u help me?

Well, voltage ratios are easy, as I said. Max voltage cannot be measured, as it depends on the insulation. You can, however, make insulation assumptions for the primary winding if you know where the xformer came from (eg. a mains transformer pulled from most european user equipment will handle 240V).. You can calculate max power if you can get a good estimate of the cross-sectional area of the winding's wire, usually the same wire connecting to the Xformer terminal. Knowing the resistance of the winding (ohmmeter) and the cross-sectional area of the conductor, you can get a good idea of it's length..

Hi,

To Vendelay, you say "Turns ratio (voltage ratio primary to secondary) can be calculated pretty easily by applying a sinewave to one winding and measuring the amplitude on another winding.. "

How to measure amplitude ?

Thanks

Hi,

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