After our EMI computer monitor Tech Tip the other day, several readers responded with other EMI related tips:
One reader suggests using mu metal or steel as a shield for the monitor. Thick pieces can cost less than aluminum and will, arguably, work as well or better.
“If people have access to an oscilloscope, they can build an EMI “sniffer” by hooking a loop of wire between the probe tip and the ground clip (or simply hook the ground clip to the probe tip itself). Poking the sniffer at various angles in the vicinity of suspect EMI noise sources, will usually yield an incriminating oscilloscope display.”
Another reader adds that an AM radio can be used as an EMI sniffer.
“For your do-it-yourself customers, it is important to get a snug fit when re-assembling equipment. Many times the EMI integrity of products relies on solid connection of the enclosure. It doesn’t take much of a gap to allow the high-frequency energy to escape into (or out of) a box.”