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Measuring power supply ripple with Siglent 1202X-E

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dophuc:
Here is how I tested the ripple & noise of DC power with Scope:

- The DC power supply and the Scope are powered by an isolating transformer to ensure that they are not affected by AC mains. If I want to be more precise, I will separate the power supply for the oscilloscope from the AC mains, while the DUT is powered by an isolation transformer.
- Coax cable attached to the Siglent SDS1104X-E.
- At the output of the DC source, I connect 0.1uf+10uf (50V) ceramic capacitor in parallel, and use a 0.01uf capacitor to block the DC signal. I tried replacing the 10uf ceramic capacitor with a 10uf Tantalum capacitor but the results didn't make much of a difference.
- Ripple & noise about 3.36 mVp-p.
Compared to using probe with GND wire ripple & noise about 8.96 mVp-p

Another example compares the ripple & noise of 65W GaN charging when using the oscilloscope probe far from the source with using a coax cable near the output of the source, the results will be different.

markus_jlrb:
BTW,

the KP18X introduce own noise,

se thread

https://www.eevblog.com/forum/testgear/an-investigation-about-ripple-current-of-kunkin-kp184/

Take a plain resistor as load not to mix noise of other devices in your test.

Markus

BillyO:

--- Quote from: markus_jlrb on September 02, 2023, 06:25:56 am ---Take a plain resistor as load not to mix noise of other devices in your test.

--- End quote ---
Well, that's the trick isn't it?

u666sa:

--- Quote from: MarioBros69 on August 31, 2023, 09:24:29 pm ---How is this possible?

--- End quote ---

You doing it wrong!

The manufacturer: making all conditions ideal.
YOU: not doing it like the manufacturer  :-DD

A) You gotta load your PSU. Load with 1 amp through your multimeter.
B) You gotta install two caps in parallel
C) You gotta use probe without ground wire, directly with a paper clip or spring
D) You gotta turn off your lights and all other electronics in the room, including computer
E) You gotta use 20 Mhz bandwidth limit
F) You gotta use 1x probe
G) You gotta use AC coupling

...and even after all of this, you still would go out of spec, because you measuring at the output terminals of your PSU and not on your PSU's board.    :palm:



Basically, in repair, if it's out of wack it won't work, so if you see it out of wack too much and it don't work, assume it is out of wack.

sonpul:
Delta, MeanWell...e.t.c. Use for the technical report such scheme.

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