We also run a daily check of all our emission sites. These are simple peak sweeps that can be done in minutes. Those minutes can save you hours of investigation if you wait a month to check your systems and find a problem. We run monthly checks as well. These are a bit more detailed and involve checking all the detectors on the receivers. We use a commercially available broadband source. I prefer these over comb generators because your peak, QP and average measurements will not all be the same as each other as can be the case with a narrowband CW from a CG.
Sam Wismer VP, Technology Advanced Compliance Solutions, Inc. [email protected] <blocked::mailto:[email protected]> 770-831-8048 ext. 203 www.acstestlab.com <blocked::http://www.acstestlab.com/> ATLANTA, GA – MELBOURNE, FL – BOCA RATON, FL ****************CONFIDENTIAL**************** This e-mail and any attachments may contain information which is confidential, proprietary, privileged or otherwise protected by law. The information is solely intended for the named addressee (or a person responsible for delivering it to the addressee). If you are not the intended recipient of this message, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete it from your computer. ________________________________ From: Bill Owsley [mailto:[email protected]] Sent: Monday, March 28, 2011 4:49 PM To: [email protected] Subject: Re: [PSES] Daily RE Chamber Check We started doing that each day... and found that the RF switches would get a little iffy over the weekend. So we added a "chatter the switch" routine to the check. This toggled them back and forth until the reading stabilized. Attitude is Mind over Matter. If you don't Mind, it doesn't Matter... This email has been displayed using 100% recycled electrons and 100% pure virgin photons. ________________________________ From: "Price, Edward" <[email protected]> To: [email protected] Sent: Monday, March 28, 2011 2:33 PM Subject: Re: Daily RE Chamber Check Chris: In Military testing, an ambient measurement is mandatory, so you are always checking your facility for rogue emissions. Beyond that, you also want to be sure that your measurement analyzer doesn’t have internal spurious signals (we used to call them birdies). In commercial testing, I suppose you could start the day with a simple Peak detector scan. This wouldn’t be much of an overhead, as it would require only a few minutes. That might look very impressive to your auditors when they ask about you diligence and you can show them several hundreds of ambient data files. Practically, even if there are many ambient emissions inside your chamber, what does it matter as long as they are all well below the test limits of the day? I frequently face this condition; not because of true ambient signals getting into my enclosure (my chamber is superbly quiet), but because of signals that leak into the test environment from support equipment needed to exercise the EUT. I have seen software that attempts to delete ambient signals from your operational data, but I don’t like that approach. Ed Price [email protected] WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of Chris - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. 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