Tutorial: How to test a smps transformer

There is not much info about testing smps transformers so I gave it a try and show you some tests. Maybe it is usable for you.
On my website you find more about measurements on transformers:

[cluna]

Great job explaining the subject matter I enjoyed it very much thank you.

[jameswest]

Thank you. This is just what I was looking for and so well explained. Now to find if my transformer is working. I hope I don't have to rewind it, but have a feeling I will...

[guillermoiturriaga]

USE OR FYI BLUE RING TESTER of BOB PARKER.

Practical AND economical real test.

[leohobbleohobb]

You have a good lcr meter.Have the same also.They work great.

[onesupremelife]

Thank you for this @pa4tim Also you're website is very informative.

[suhailasaba]

Is there an explanation for as increasing frequency would give more power for a switching mode power supply ?

[akshaymath]

What if my input is pulse waveform how do my transformer behaves. I checked the same my input at primary side is getting squeezed and i observe oscillations kind of waveform if I zoom the waveform is this observation correct or something wrong with my transformer..?

[suhailasaba]

At the moment 10:39 I see that the amplitude of the input and output signal are the same. Does that mean that the transformer is a 1 to 1 transformer ?

[ΠάριςΑζής]

You said you repair transformers. I understand that you do rewinding of their coils. Is that so? If yes, how do you dismantle them? Their core parts are very hardly glued together. And after their rewinding what kind of glue do you use to reglue the core parts again?

[arvinbaba]

Thanks, how to check primary winding short?