I can see how adding gain ahead of the SA lowers the noise floor, but I don't see how a preselector can do same. A preselector seems most useful in tuning only the frequency band of interest, rejecting (attenuating) the rest. _______________________________________________________________________________
Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering From: "Grasso, Charles" <charles.gra...@echostar.com> To: EMC-PSTC@LISTSERV.IEEE.ORG, Date: 10/22/2015 01:32 PM Subject: Re: [PSES] Preselector requirement in ANSIC63.4 -low PRF Hey Ken – thanks! The note in ANSIC63 says that the preselector is required to increase the dynamic range of the instrument. Is it simply a noise floor issue – but then why the <20Hz specificity? Best Regards Charles Grasso Compliance Engineer Echostar Communications (w) 303-706-5467 (c) 303-204-2974 (t) 3032042...@vtext.com (e) charles.gra...@echostar.com (e2) chasgra...@gmail.com From: Ken Wyatt [mailto:k...@emc-seminars.com] Sent: Thursday, October 22, 2015 1:23 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Preselector requirement in ANSIC63.4 -low PRF I would think that if the measurements were taken in a chamber and the product emissions were characterized and amplitudes known and the analyzer was a good quality one, justification could be made to eliminate the preselector. I suspect the requirement was established during the days we all were using OATS. Kenneth Wyatt Woodland Park, CO Sent from my iPhone. On Oct 22, 2015, at 12:58 PM, Sundstrom, Mike <mike.sundst...@garmin.com> wrote: So the SA is not in overload, which could give a wrong amplitude otherwise. Thanks, Michael Sundstrom Garmin Compliance Engineer 2-2606 (913) 440-1540 KB5UKT “Never give up on a dream just because of the time it will take to accomplish it. The time will pass anyway.” Earl Nightingale From: Grasso, Charles [mailto:charles.gra...@echostar.com] Sent: Thursday, October 22, 2015 1:53 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Preselector requirement in ANSIC63.4 -low PRF Hell all, ANSI C63 *requires* the use of a preselector on an SA when making QP measurements of a signal with a low repetition rate (lower than 20Hz or less). Does anyone know why? Best Regards Charles Grasso Compliance Engineer Echostar Communications (w) 303-706-5467 (c) 303-204-2974 (t) 3032042...@vtext.com (e) charles.gra...@echostar.com (e2) chasgra...@gmail.com - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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