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Click here to read about RF CafeKirt Blattenberger
BSEE
KB3UON
EIEIO

Carpe Diem!
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EMI Troubleshooting Kit
EMI Troubleshooting Kit - RF CafeThere 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.

EMI Troubleshooting Kit - RF Cafe



Posted  March 2013
 

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