Products > Test Equipment
Measuring power supply ripple with Siglent 1202X-E
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.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version