Geoff, I have had further thoughts on the headset immunity testing:
The requirements of an artificial hand on a telephone handset is to simulate a human hand on the handset, normally within a handset there are 2 wires being fed through the handset to the earpiece which would be enveloped in this "copper hand". So as far as I can see and as the headset is "hands free" there would be no requirement for a copper hand. If the artificial hand were to be used as "due diligence" to the standard the question would arise as to where it would be placed, as normally there is no wires in the head band of the headset. Either between the Mic and earpiece (along the plastic arm) or around the connecting wire of the headset? Ideally both would be tested but due to time restraints etc not preferred. Regards, Jon Jones Senior Approvals Engineer Ascom Telecommunications Ltd. Jon, EN55024 uses the IEC 61000-4-x series to define the test set-up. I had a quick look at 61000-4-6 and could only find a reference to a handset. This, in turn refers to IEC CISPR 16-1 for the details of the artificial hand. The telephony sections of EN55024 are based on a standard POTS or ISDN audio telephone with a handset. In the real world, the effects of a human holding a handset and wearing a headset would be similar. Most handsets have a similar shape, and are catered for by CISPR 16. The answer to your question may be buried deep in one of the normative references. For EN55024 Annex A, you will need to measure the sound pressure level at the earphone, as you would with a normal handset. If you placed part of the headset in the artificial hand, you would be showing due diligence in meeting the spirit, if not the letter, of the test set-up. My opinion, not necessarily that of my employer. Geoff Lister Senior Engineer Motion Media Technology Ltd., Bristol, UK. http://www.motion-media.com -----Original Message----- From: Jon Jones [mailto:[email protected]] Sent: 21 August 2001 12:37 To: Emc-Pstc Subject: Immunity testing of Headset Group: Performing RF immunity testing to EN55024 on a telephone, an artificial capacitive hand must be placed around a telephone handset. Does anyone know of if there is a similar requirement when testing a Headset ? Thanks in advance Jon Jones Senior Approvals Engineer Ascom Telecommunications Ltd. ------------------------------------------- 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.
