RE: 61000-4-8 Ground Plane
Bob, The standard (in the definitions section) only says that the ground plane "is used as a common reference for the magnetic field generator and the auxiliary equipment", but I suspect that safety is a major reason for it being used. Without a good ground reference there is a possibility that dangerous potential differences could be created by the very strong power-frequency magnetic fields used. Naturally, the GRP must be of non magnetic material to prevent it from shunting some of the magnetic flux. Scott Lacey -Original Message- From: owner-emc-p...@ieee.org [mailto:owner-emc-p...@ieee.org]On Behalf Of rehel...@mmm.com Sent: Friday, June 16, 2000 10:32 AM To: emc-p...@majordomo.ieee.org Subject: 61000-4-8 Ground Plane Can someone explain to me why a ground plane is required in the test setup for EN 61000-4-8 (power frequency magnetic fields)? Thanks, Bob Heller 3M Company --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: 61000-4-8 Ground Plane
As the drawings show in EN61000-4-8, one way to achieve the required field is to let the ground plane be the fourth side of a square loop. I have found it more convenient to construct stand-alone loops that can be placed over and under the EUT which is supported above an appropriate ground plane. I would surmise that the requirement to ground one side of the loop is based on safety of the person performing the test. A multi-turn loop conceivably could require more than a few volts to achieve the required current flow to produce the desired magnetic field intensity. >Can someone explain to me why a ground plane is required in the test setup for >EN 61000-4-8 (power frequency magnetic fields)? > >Thanks, >Bob Heller >3M Company --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
NEBS: Trans\Vib & ISTA standards (International Safe Transit Asso ciation)
Group, In addition to my NEBS GR-63 Transportation Vibration certification, I am also handling meeting a Manufacturing Quality Engineering Spec called "ISTA (International Safe Transit Association). Has anyone had any experience with ISTA? Has anyone tried combining the most stringent requirements of each spec into a single test script and perform one test for both standards? And finally, do you know of any labs that are certified to test to both standards... preferably west of the Mississippi? Thanks in advance, Jeffrey Collins MTS, Principal Compliance Engineer Ciena Core Switching Division jcoll...@ciena.com www.ciena.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
