Hi Balmukund, A good point. I've certainly used notch filters in the past for removing the intentional radiator to prove that the second harmonic is in fact an artefact of the measuring instrument. I've also done this by increasing the attenuation on the input to the analyser until the second harmonic suddenly reduces by more than the amount of attenuation inserted - I'm sure I read about that technique on this forum.
I guess if you took into account the loss vs frequency characteristics of the filter in your measurement factors then I can't immediately see a reason why you couldn't use one. Would be interested to hear other opinions on the topic. James Pawson Unit 3 Compliance -----Original Message----- From: Balmukund Vyas [mailto:balmukund.v...@ymllabs.com] Sent: 26 July 2017 05:11 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] application of CISPR 32 to EUTs with integrated radio transmitters Is it possible to use notch filters and measure rest of the frequencies? -----Original Message----- From: T.Sato [mailto:vef00...@nifty.com] Sent: 25 July 2017 17:41 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] application of CISPR 32 to EUTs with integrated radio transmitters Hello members, Thanks all who responded. I hope CISPR makes this topic clear in near future. Regards, Tom -- Tomonori Sato <vef00...@nifty.com> URL: http://t-sato.in.coocan.jp On Sat, 22 Jul 2017 03:10:27 +0900, "T.Sato" <vef00...@nifty.com> wrote: > Hello members, > > I want to hear of your opinion - while emission measurement for CISPR 32, integrated radio transmitters must transmitting? > > > Although the standard is not clear whether radio transmitter can be set off in emission measurement, I believed we can set radio transmitter off, as: > > - CISPR 32 said "The radiated emission requirements in this standard are not intended to be applicable to the intentional transmissions from a radio transmitter as defined by the ITU, nor to any spurious emissions related to these intentional transmissions." > > - If non-transmitter function of the equipment (such as CPU clock and harmonics) generates emissions in the frequency band of the intentional transmission of the transmitter (such as 2.4 to 2.5 GHz), I think we should apply the emission limits as the emissions are not related to the intentional transmissions. However, it is difficult to measure such emissions in presence of the intentional transmission. > > - The standard says "Compliance can be shown by measuring the EUT's emissions when operating its functions simultaneously, individually in turn, or any combination thereof." So, even if emissions from the transmitter function must also be considered in the standard, it should permissible to test non-transmitter function of the equipment while transmitter is set off. > > - Then, if the transmitter function of the equipment is tested while all the other functions are set off, all the emissions measured are those caused by the transmitter. > > > However, I heard of strong opinions that the emission measurement must be run while the integrated radio transmitter is transmitting, and all the emissions in the frequency bands of intended transmissions and those harmonics should be simply ignored. > > > What do you think about this? > > Regards, > Tom > > -- > Tomonori Sato <vef00...@nifty.com> > URL: http://t-sato.in.coocan.jp > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. 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