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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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