Thanks to all who responded. After hearing this, it's opened up a whole new set of questions on Bellcore conducted emissions tests!
1) Standard LISNs do not have 50 ohm loads on their RF port (the EMI receiver and a 50 ohm terminator take care of this). I don't see this addressed in the Bellcore spec. Are 50 ohm terminators used on the LISNs? 2) It appears that some conducted emissions are tested twice with different power source setups: - Once with a voltage measurement from a LISN over 0.45-30MHz. (Requirment-Object List R3-5) - Another time with a current probe measurement over 0.01-30MHz. (Requirment-Object List R3-6) Am I reading this correctly? 3) Changing from a "zero ohm" (bypass capacitor) network to a 50 ohm network is a significant change. Out of curiousity, were the limits altered as well? On Thu, 15 Jun 2000 15:08:16 -0400, Mark Gill <[email protected]> wrote: >Bypass caps were used in an older version of 1089, and subsequently replaced >with LISNs in the current version. > >Regards, > >Mark Gill, P.E. >EMC/Safety/NEBS Design >Nortel Networks - RTP, NC, USA ---- Patrick Lawler [email protected]
