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Measuring power supply ripple with Siglent 1202X-E

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BillyO:

--- Quote from: MarioBros69 on September 01, 2023, 05:46:54 am ---The strangest thing is that with the power supply off I get the same noise level

--- End quote ---

That's where you need to start.  Get that noise dealt with first.

tautech:

--- Quote from: BillyO on September 01, 2023, 05:50:36 am ---
--- Quote from: MarioBros69 on September 01, 2023, 05:46:54 am ---The strangest thing is that with the power supply off I get the same noise level

--- End quote ---

That's where you need to start.  Get that noise dealt with first.

--- End quote ---
Yep, and it could be anywhere nearby.

A customer with brand new 4ch X-E called, convinced the new scope we supplied was faulty as there was unexplained 24kHz interference in his circuits......a wallwart behind a curtain across the room was the culprit.

Kean:

--- Quote from: tautech on September 01, 2023, 07:00:01 am ---a wallwart behind a curtain across the room was the culprit.

--- End quote ---

Always pay attention to the wallwart behind the curtain!

tautech:

--- Quote from: Kean on September 01, 2023, 09:47:29 am ---
--- Quote from: tautech on September 01, 2023, 07:00:01 am ---a wallwart behind a curtain across the room was the culprit.

--- End quote ---

Always pay attention to the wallwart behind the curtain!

--- End quote ---
;D
It had the poor chap really stumped after checking adjacent rooms and turning OFF most appliances in his house then to find a wallwart that belonged to whom he did not know.

It's only when you purposely go looking for RFI with something as simple as the Reference (Gnd) lead clipped to a probe grabber which makes a useful RFI pickup that you realise how many appliances are noisy, either their circuits or PSU's.
So useful is a probe used in this manner I even use it for setting peak RPM in a chainsaw.
12000rpm/60 = 200Hz.

BillyO:

--- Quote from: tautech on September 01, 2023, 03:15:27 am ---I said:
BW limit and 1x probe should be used for PSU measurements.

The modern 1x probe is itself a BW filter to some 6-10MHz as its additional tip capacitance helps reduce noise.
Of course probing technique itself further determines what we might see as does if the PSU is linear or SMPS.

--- End quote ---
All agreed.

My point though was to not use any kind of filtering.  It just amounts to sweeping the dirt under the rug.

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