The coupling between AC and output in any LISN network is AC, so I doubt that there is any specification for the receivers coupling, as this makes no technical difference. I do not know of any restriction in CISPR16 regarding the coupling.
Theoretically the difference between AC and DC coupling is just a frequency range extension to include 0 Hz... So you should DC-couple this specific instrument to be compliant. Regards, Ing. Gert Gremmen g.grem...@cetest.nl www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. Van: Gordon,Ian [mailto:ian.gor...@edwardsvacuum.com] Verzonden: Tuesday, November 10, 2009 1:01 PM Aan: ce-test, qualified testing bv - Gert Gremmen; IEEE EMC & SAFETY PSTC Onderwerp: RE: AC or DC coupling in emissions measurement I accept that the instrument works this way but what do the standards require? Ian Gordon From: ce-test, qualified testing bv - Gert Gremmen [mailto:g.grem...@cetest.nl] Sent: 10 November 2009 11:59 To: Gordon,Ian; IEEE EMC & SAFETY PSTC Subject: RE: AC or DC coupling in emissions measurement This is an easy one: Tha AC mode of this analyser ESCI-7 is specified from 1 MHz off. See R&S datasheet: http://www2.rohde-schwarz.com/file_12539/ESCI_dat_sw_en.pdf Regards, Ing. Gert Gremmen g.grem...@cetest.nl www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 P Before printing, think about the environment. Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens Gordon,Ian Verzonden: Tuesday, November 10, 2009 11:20 AM Aan: IEEE EMC & SAFETY PSTC Onderwerp: AC or DC coupling in emissions measurement All I have recently been using a receiver (Rohde & Schwartz ESCI 7) which has the ability to switch between AC and DC coupling of input signals. When I use the receiver to measure the unmodulated output of a signal generator set at 150kHz & 60dBuV the receiver indicates 57dBuV when AC coupled and 60dBuV when DC coupled. Our older receiver (Teseq SCR3102) doesn't have the facility to switch between AC & DC coupling and indicates 60dBuV. I presume the receiver should indicate 60dBuV for a 60dBuV signal but which type of coupling is required by EN55011 & EN55022? Ian Gordon --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- The contents of this email and any attachments are confidential and are provided solely for the use of the intended recipient(s). If you are not the intended recipient, you are hereby notified that any copying, disclosure, distribution, or use of this e-mail, its attachments or any information contained therein is unauthorized and strictly prohibited and you should please contact the sender immediately and delete this e-mail and any attachments from your system. No responsibility is accepted for any virus or defect that might arise >from opening this e-mail or attachments, whether or not it has been checked by anti-virus software. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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