Makes me wonder what the Marconi is really doing. A check with a fast oscilloscope will show if the amplitude is rising nicely and is well behaved.
Dave Cuthbert From: Rosenberg, Drew [mailto:drew.rosenb...@itron.com] Sent: Monday, April 19, 2004 3:32 PM To: drcuthbert; emc-p...@majordomo.ieee.org Subject: RE: Calculating/predicting Quasi-peak of a single pulse RBW=120kHz VBW=300kHz From: drcuthb...@micron.com [mailto:drcuthb...@micron.com] Sent: Monday, April 19, 2004 4:30 PM To: Rosenberg, Drew; emc-p...@majordomo.ieee.org Subject: RE: Calculating/predicting Quasi-peak of a single pulse Drew, What have you got the RBW and VBW set to? Dave Cuthbert Micron Technology From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of Rosenberg, Drew Sent: Monday, April 19, 2004 3:00 PM To: emc-p...@majordomo.ieee.org Subject: Calculating/predicting Quasi-peak of a single pulse Hi EMC Gurus, I have been struggling with something for a while and have decided that this is the best place to send my question: I would like to better understand how quasi-peak is determined on a single pulse of specified duration. From my understanding, Quasi-peak applies an RC time constant to the pulse. If the pulse length equals 5 times the RC time constant, then the QP measurement will be roughly 99% of the peak measurement. According to CISPR-16-1 Table 1, the charging time constant specified is 1 ms. Therefore, according to my understanding, QP should be 99% of peak measurement at 5ms. However, my experiments have given very different results. I have an HP8593E spectrum analyzer. In an effort to prove my understanding of CISPR-16-1's definition of Quasi-peak, I applied a 1 second 900 MHz pulse to the spectrum analyzer with QP detection on. This 1 second pulse was applied using the pulse trigger of a Marconi 2024 sig gen. To my surprise, QP did not equal peak until about 500ms. Does anyone know why I am getting such different results than what I had predicted? I have data and analyzer pics if anyone thinks that they would help. I have been told that attachments are not good for list servers, so please let me know if you would like to see them. Regards, Drew Rosenberg Regulatory Engineer Itron, Inc. 2401 North State Street PO Box 1735 Waseca, MN 56093 Tel 507-837-5264 Fax 507-837-5200 drew.rosenb...@itron.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message was scanned for viruses!! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
