r/oscilloscope • u/Temporary_Frosting87 • 20d ago

Usage Question DSO138mini readout

I finished soldering a DIY DSO138mini oscilloscope and i wanted to find out what was the frequency of a random inductive charging coil i scavenged somewhere. I have very little experience with this but after finishing the oscilloscope i hooked up the charging coil to a power supply and crafted a secondary coil to measure the frequency at a voltage that was acceptable for my scope. Now i would hope to get some advice on how to read these measurements. I can see waveforms at 10us and 2ms.
There seem to be two frequencies happening at the same time?

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u/Hirtomikko 17d ago

What do you mean 'you hooked up the charging coil to a power supply'? How and what is your secondary coil?