Ken, Yes, you are right, the standards can sometimes be a compromise based on what is technically feasible and practical. No point in a standard that requires equipment that is not available or cost prohibitive. Unless you count the old GR1089 bulk current injection standard that had a test level of 0.7 amps injected current at 10kHz. :-) I guess the 3m distance requirement is to keep the test in the far field for repeatability, while the real world would have the interfering source much closer, therefore the disparity in the power figures you stated. I have seen some standards (internal company standards) that required testing the EUT at high v/m levels (something like 40 to 60 v/m) in the common transceiver bands. You are right, the 61000-4-3 test is much better, in my opinion, than the old 801-3 test. I never liked the idea of real-time leveling with the probe next to the EUT, especially in a non-anechoic chamber. Cheers, Bob Richards, NCT.
Ken Javor <[email protected]> wrote: No serious differences with anything stated below, just a different point-of-view. If you take the most stringent requirement, 10 V/m, add headroom for required AM and establish the field three meters from the XMIT antenna, pure theory predicts a need for 60 Watts. In practice I believe people use amplifiers rated above 100 Watts from 80-1000 MHz. That doesn't sound like a handheld transceiver to me... I think the driver on the 1.5 meter square quiet zone is largely economic. The size of that quiet zone (as well as the frequency range over which it is mandated) drives room size, absorber needs and amplifier rating. The 1.5 meter square quiet zone is the most controlled radiated immunity requirement to date. It isn't perfect, but it is way better than anything which preceded it, and way more expensive to implement. The issue o! f keying on/off vs. AM or FM all falls under the heading of modulation. It used to be that for military testing you were supposed to figure out the worst case real-world modulation and use that. Nowadays everyone is in too much of a hurry to do that. In lieu of that preparatory work, one of my Customers requires multiple modulations within a single band (AM/FM/pulse), requiring multiple sweeps. Lots of time spent in the test lab... ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
