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Measuring power supply ripple with Siglent 1202X-E
MarioBros69:
Hello, I have tried to measure the ripple of a Geti 3005E power supply, according to the specifications the ripple should be 1mV (RMS) 20mV (p-p)
The two pictures below are almost the same, but one is with the power supply on and the other is with the power supply off
How is this possible?
The 1202X-E is not valid for measuring the ripple of this source or is it that the noise exceeds the ripple and I can't see it?
Grandchuck:
Noise from the environment. Not the power supply.
pope:
Better measure with the bandwidth set to 20MHz (not full as in your pictures)
Martin72:
Hi,
First, real screenshots from the scope would be better.
Then:
What we see there is only noise, not ripple - Because the setup you made is not the way it should be.
Ripple has to be measured as near as possible, so you should measure it directly at the output, to minimize unwanted noise.
MarioBros69:
The truth is that I have tried connecting the probe directly to the source and there is no big difference
With 20 Mhz it removes some noise but I still can't see the ripple and the strangest thing is that with the source off it shows almost the same
With this oscilloscope and the default probe, should I be able to see it?
Below a closer shot
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