Hi All, I am not 100% clear on the statement regarding cable layout in Figure 10 "Test Configuration: tabletop equipment (radiated measurement)" It says: 1. If cables which hang closer than 40cm to the horizontal metal ground plane cannot be shortened to appropriate length, the excess shall be folded back and forth forming a bundle 30cm to 40 cm.
What does it mean when it says "...cannot be shortened to appropriate length...? This conflicts with section 8.1 which says you must test with the lengths specified for the product. I bundle various 2m and 3m length cables that are intended to be connected to an EUT peripheral horizontally and those that are intended to be connected to the PSTN, or other external termination point, vertically. Also, PSU's on the floor with an output lead to the EUT is bundled vertically. Normally there are no peripherals, or PSTN, attached but I connect the cables anyhow for worst case. I do not connect similar interface ports, only one of the same type. It all becomes rather "messy" or "busy" with lots of bundled cables. Once I have found the worst case emissions cable setup, I "tape" these in position to a hanging nonconductive surface and take a photograph. This is for repeatability in future audit testing. Am I doing this wrong? It would seem from the diagram that you have the option to "shorten to appropriate length" e.g. 1M? Also it looks as if the vertical cable shown is only 40cm? I am sure someone out there knows exactly how it should be done or is the standard not clear? Kind Regards Alex McNeil Principal Engineer Tel: +44 (0)131 479 8375 Fax: +44 (0)131 479 8321 email: [email protected] -----Original Message----- From: Mark Pascarelli [mailto:[email protected]] Sent: Monday, November 26, 2001 4:47 PM To: 'emc-pstc' Subject: Frame Surge Test Hi all, I am trying to re-design our current power supply to meet GR-1089-Core Specification. The Power Supply has a -48V input and 5VDC/100W, 5VDC/100W and 12VDC/150W Output. Based on current testing, we did not comply with Section 9.10.6 Frame Surge Test. This test applies a surge current as defined in IEEE C62.41. The filter capacitor was destroyed during this test. The capacitor is rated at 100V. I think this capacitor should be replaced with a higher voltage X or Y capacitor. Possibly a GDT or TVS is required. If anyone can help, I will email a portion of the schematic in PDF format. Thank you, Mark Pascarelli Electrical Engineer Carlo Gavazzi, Inc. ------------------------------------------- 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: Michael Garretson: [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: No longer online until our new server is brought online and the old messages are imported into the new server. ------------------------------------------- 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: Michael Garretson: [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: No longer online until our new server is brought online and the old messages are imported into the new server. ------------------------------------------- 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: Michael Garretson: [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: No longer online until our new server is brought online and the old messages are imported into the new server.
