Cameron: That's fairly easy to do as long as you:
1. Take all measurments from the same reference points before and after the changes and 2. Use a DC block on the input to the analyzer ;other wise you may have an expensive input to replace. Most analyzers inputs are not protected for DC. Most companies sell the DC isolator as an accessory. Ralph Cameron EMC Consultant and Suppression of Consumer Electronic Equipment. ----- Original Message ----- From: "Cameron O'phee" <O'[email protected]> To: "'EMC - PSTC Forum'" <[email protected]> Cc: "Roman Seifert" <[email protected]> Sent: Wednesday, September 27, 2000 8:59 PM Subject: Probing power plane with analyser. > > Hello All, > > I have been asked by one of our design engineers if I can measure the RF > signature on the 3v plane on one of our PCB designs. The purpose of this is > to compare it to proposed changes for cost reduction, ie removal of bypass > caps. I would assume I need some sort of CDN but I have no designs for this > application. Does anyone have any ideas on how I can safely probe a 3v DC > power rail with an EMC analyser (HP8591E)? > > > Regards, > > Cameron O'Phee. > EMC & Safety Precompliance. > Aristocrat Technologies Australia. > > Telephone : +61 2 9697 4420 > Facsimile : +61 2 9663 1412 > Mobile : 0418 464 016 > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > > > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
