Hi James, You will get a lot of noise already from the scope and probe. You have to use really good equipment and setup.
Best regards, Boštjan From: James Pawson (U3C) <ja...@unit3compliance.co.uk> Sent: Thursday, January 2, 2025 9:55 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Power supply noise CAUTION: This email originated from outside of our organisation. Do not click links or open attachments unless you recognise the sender and know the content is safe. I would run the equipment off a known quiet linear power supply to determine if power supply noise was really the issue. All the best James James Pawson Managing Director & EMC Problem Solver Unit 3 Compliance Ltd EMC : Environmental & Vibration : Electrical Safety : CE & UKCA : Consultancy www.unit3compliance.co.uk<http://www.unit3compliance.co.uk/> | ja...@unit3compliance.co.uk<mailto:ja...@unit3compliance.co.uk> +44(0)1274 911747 | +44(0)7811 139957 2 Wellington Business Park, New Lane, Bradford, BD4 8AL Registered in England and Wales # 10574298 For inquiries, bookings, and testing updates please send us an email on he...@unit3compliance.co.uk<mailto:he...@unit3compliance.co.uk> or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. From: doug emcesd.com <d...@emcesd.com> Sent: 25 December 2024 02:55 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Power supply noise Hi All, Here is a scenario: there is a noise problem in a system and you suspect the main DC power supply which operates off the 60 Hz AC mains. So, you take a scope probe, a trusty 10X Hi-Z one, connect it across the output of the supply from + to - at the output of the supply, - going to the system ground. You see 1+ Volt peak-to-peak spikes on the scope at the fundamental switching frequency of the power supply. What is the first thing you do? Doug Smith Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org<mailto:d...@dsmith.org> Website: http://dsmith.org ________________________________ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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To post a message to the list, send your e-mail to EMC-PSTC@LISTSERV.IEEE.ORG All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/<https://www.mail-archive.com/emc-pstc@listserv.ieee.org/%20> Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe)<https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net<mailto:msherma...@comcast.net> Rick Linford at: linf...@ieee.org<mailto:linf...@ieee.org> For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org<mailto:j.bac...@ieee.org> ________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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