Products > Test Equipment

Measuring power supply ripple with Siglent 1202X-E

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Fungus:

--- Quote from: MarioBros69 on September 02, 2023, 09:15:31 pm ---And it leads me to the next reflection, does it make sense to buy an expensive oscilloscope if you are in a noisy environment?

--- End quote ---

You can usually work on the background noise to reduce it.  :popcorn:

Fungus:

--- Quote from: tautech on September 02, 2023, 09:39:51 pm ---$379 expensive ?  :-//

--- End quote ---

Yep, and this is your blind spot...

Fungus:

--- Quote from: tautech on September 02, 2023, 09:59:08 pm ---Offering the same sensitivity and BW....nope !

--- End quote ---

But not everybody needs that. 500uV and 200MHz will make no difference at all to the average Arduino hacker.

Caliaxy:

--- Quote from: dophuc on September 01, 2023, 05:48:30 pm ---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.

--- End quote ---

No 50 ohm termination?

tautech:

--- Quote from: Fungus on September 03, 2023, 11:20:11 am ---
--- Quote from: tautech on September 02, 2023, 09:39:51 pm ---$379 expensive ?  :-//

--- End quote ---

Yep, and this is your blind spot...

--- End quote ---
:-DD
You think ?
My eyes are wide open and can well see the poo that's offered to the marketplace.....bit of a shame buyers of that poo don't have their eyes open too.

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