At 7:49 AM +0200 7/20/99, fven...@alcatel.altech.co.za wrote: My question relates to the limit lines in CISPR 22/EN 55022. Would you >say that it is valid to apply the limits in the standard to a conducted >emission test on a dc line.
EN55022 line conducted testing is based on the interference susceptibility of broadcast receivers that may be connected to the same power lines and which may pick up unwanted RF emissions on the mains via power cords. The same thing could (does) happen when a battery/DC powered receiver is connected in parallel with other DC equipment on the same power circuit. The CISPR committee agreed that the published limits are reasonable for the first scenario. Your telco customer may these limits are adequate for protecting his equipment, or he may require more extensive testing, down to 10 kHz or beyond 30 MHz. I believe the Belcore conducted tests for telco office equipment are almost identical to the EN55022 in the .450 - 30 MHz range, but don't have a copy with me here. I recall the limits going down to 10 kHz, perhaps lower. Best regards Tom Cokenias T.N. Cokenias Consulting P.O. Box 1086 El Granada CA 94018 tel 650 726 1263 efax 413 332 6528 --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
