Hi All, When thinking about power supplies, one would think that they either work or not. But this is not the case.
Switching power supply frequencies are usually much lower that today's system frequencies. This leads to a situation where it can take an hour or much more for an edge to hit a circuit in the system at a critical time and cause a problem. The problem looks like an intermittent one, but it is not intermittent! It is sort of like a beat frequency between a system signal and the power supply switching. This class of problems is very interesting. I have been tracking them down for about 40 years now and have developed some techniques for doing this. Tracking down what seem like intermittent problems can take a lot of time, but power supply interaction with a system is not an intermittent problem but sometimes takes a bit to track down a fix. I have seen these kinds of problems where a switching supply, not even connected to that part of the system, cause this kind of problem in a circuit a meter or more away from the supply. This is the kind of problem I love! Like a cat and mouse game, often requiring unconventional troubleshooting methods. Doug [https://lh4.googleusercontent.com/_HuR3Ky2TF_XhFHyxnYRmiq7nHQldnMsPNYFaLG6kb5T4y8MeCe-BDC_BscJtSFgszSSjssihHS-pjM3-jwNP8S0CwE-gN8fsRsPkojiAlmpBwb20vIVizS-siCUywW_jqrefbVr] - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to [email protected] All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
