Re: What is a CSN60?
If you are new to SMPSUs you need to remember that the gate of a MOSFET gate is made of the same stuff as computer memory.
It will "remember" what way round the leads on your diode tester were when testing the gate for quite a few minutes. The FET will remain in the ON state as a legacy of your previous test.
You need to touch the leads on a conductive surface such as a wet finger between tests to prevent confusion.
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