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Power supply ripple???

OK thought I would learn more about this scope and see if there is some nasty ac on the power supply. On the below post there were some thoughts on why the voltage drop across the choke was different than a resistor. Ac ripple was brought up so I thought I would check it.

Being a light weight when it comes to scopes I posted a picture of the screen. I seemed to be getting around 100 to 120 vpp but according to the chart on the screen it was showing 1 kz to 4kz moving all over the place. So I am wondering what the scope is picking up?

The probe and ground are right after the last cap before the interstage transformer. Could the chokes or transformers be picking up 1kz to 4 kz from some where???

Well I am open to all comments and different test procedures etc... Would like to learn how to use this thing.

Thanks Tom

PS. Kind of looks like the stock market with all those numbers on the screen.

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Topic - Power supply ripple??? - TomWh 16:40:11 03/20/17 (12)


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