Hello Russel, Read CISPR 22 Clauses 8 and 104 how to deal with this.
Comment: Especially the reading at 1 GHz seems rather high, which antenna and measuring receiver/spectrum analyser do you use? Which measuring distance do you use? May be you should consider a pre-amplifier. Best regards Helge Knudsen Test & Approval manager Niros Telecommunication Hirsemarken 5 DK-3520 Farum Denmark Tel +45 44 34 22 51 Fax +45 44 99 28 08 email [email protected] > ---------- > Fra: Russell[SMTP:[email protected]] > Svar til: Russell > Sendt: 27. februar 2002 11:05 > Til: emc-pstc > Emne: Screened Room Ambient Scans > > > What levels would one expect to see from a scan (30MHz to 1 GHz) within a > screened room prior to testing for emissions (UUT switched off). > > I'm looking at an ambient scan starting at 32dBuV/m @ 30MHz, dropping to > 18dBuV/m @ 70MHz then gradually (with small peaks and troughs) rising to > 41dBuV/m @ 1GHz. > > Particularly at 30MHz and 1GHz this is less than 10dBuV/m below the > EN55022 > cl. B limits. Does this (high?) noise floor affect the final measurements? > > Thanks in anticipation. > > Russell. > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
