Drone refers us to this article from ELM-chaN: Power inductor checker
Here is a nice write-up on a home-brew power inductor checker for use with an oscilloscope. This device is useful for characterizing inductors from the junk-box, or pulls from dead PSU’s.
The Author says he’s switching the tester at 50Hz. I suggest that switching at the frequency you plan to use in your SMPS will give better results. Inductors should be tested at their operating frequency in order to reveal material characteristics and stray parasitics.
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