Ringing test To check transformers.
The transformer must be removed first.
To do this you apply a small!!! pulse across one winding and observe the amount of ringing.
This will show a lot of ringing on a good transformer.
If you don't have a good function generator, one of the 74xx14 pulse generator/buffers can be made to work.
Example of waveform:
And then short one of the other windings.
This should make a great! difference in the appearance of the pulsed trace.
You can also try wrapping one or more turns of wire around the core and shorting them.
If this checks out OK, I would very carefully check all of the other parts around T906.
This method does take some practice but it is a great tool to have.
-Bert
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On 7/28/2018 7:56 AM, satbeginner wrote:
You might even think about doing a ringing test on the transformer, I've
replaced a few of these over the years.
-Bert
Hi Bert,
the "ringing test on the transformer", is that a way of testing the windings of the primary transformer?
Do you have any information about this test?
Because my scope is running fine on an external 43VDC, and I am still waiting for the FET's and Diode's, if there is a way of testing the primary transformator I would like to do so.
I can easily remove the transformer and apply some sinusoidal signal to it, is there any data available in terms of no. of windings, resistance per winding, etc. for this trafo?
Un saludo,
Leo
