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EMI Troubleshooting Kit
There
is a series of articles on the Test & Measurement website
that are very much worth reading if your job or hobby involves hunting
down
RF/EMI leakage into or out of a PCB or enclosure. Author
Kenneth
Wyatt has an impressive bag of tricks you can use. One slick trick
used by his colleague
Doug Smith involves
a literal bag with a few coins in it. Shaking said bag-o-coins generates
EMI with edges in the 100 ps realm. I know from much experience
about the electrical noise caused by metal-to-metal contact from the
days of 27 and 72 MHz radio control systems in model airplanes.
Throttle control arms on the carburetors used to be made of metal, and
using a metal pushrod for connection would almost guarantee jittering
servos from EMI interference. Meshing metal gears on early R/C helicopters
was a nightmare. But I digress. Another nifty trick used by Mr. Wyatt
is to use an igniter from a patio gas grill to generate wideband EMI.
He has an easy-to-make spark gap tool as well. Take a few minutes to
scan through some of the info; you'll be glad you did if for no other
reason than the "well, huh!" factor.
Posted March 2013
Copyright: 1996 - 2026 |
About RF Cafe RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived... |
Copyright 1996 - 2026 All trademarks, copyrights, patents, and other rights of ownership to images
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