In message <[email protected]>, dated Fri, 5 Dec 2008, Gert Gremmen <[email protected]> writes:
>OK, but do you think the overload feature is less reliable implemented >than the actual read-out of a peak value? Did the manufacturer do a >lousy job ? We use an instrument to rely on its features, so do we on >the overload feature. It often does the job better than its operating >engineer. I think the point is that one should always look at results to see if there is any detectable 'oddness' about them, which might indicate that they are not reliable. For example, you see an emission at 1.1 MHz, for which there should be no reason. So you look carefully and see rather strong emissions at 25 MHz and 26.1 MHz, suggesting that the 1.1 MHz emission might be an intermodulation product. You do indeed find a weak emission at 51.1 MHz, which confirms your suspicions. The rogue emissions are still there if you attenuate the input signal to the receiver by 10 dB and even by 16 dB. So you suspect a bad contact in a connector, and a check proves that to be the case. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/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: Jim Bacher: <[email protected]> David Heald: <[email protected]>
