Ron, You will probably have a hard time finding a converter suitable for this application. Most medical devices are either (if low current draw) battery operated or use a medical grade line-frequency transformer. In the latter case they will also use a medical grade (low leakage) line cord. These have fillers that reduce capacitance between wires.
The transformers are often of toroidal construction. Many manufacurers will make these as either 1:1 or stepdown types. Using a 1:1 in front of an ac-dc converter would not be very cost effective. Another possibility may be to use a rechargeable battery with a high isolation relay to switch between charge and operate. You could then use an ac-dc of lower rating to recharge the battery. This is a good compromise for equipment of medium current draw/short patient contact time. Without knowing the particulars of your situation I cannot give more specific advice. Best Regards, Scott Lacey Test Engineer (contract) EMC, Safety, Performance Verification -----Original Message----- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Ron Sent: Wednesday, August 29, 2001 11:26 AM To: EMC Subject: Medical application-Isolation voltage I have a medical application that requires "double insulation" from the Mains to an "applied part" according to IEC60601. IEC60601 states that for a reference voltage of 250v and double insulation, the test voltage is 4000v for 1 min. I am assuming that the voltages are RMS values. How does one go about meeting the 4000v test when the highest rated ac-dc converter I can find is 3500v RMS continuous. Any help is appreciated. Thanks. Ronald Cyprowski Vascor Inc. 566 Alpha Drive Pittsburgh PA 15238 412-963-7438 x139 r...@vascor.com ------------------------------------------- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net 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: 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net 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: No longer online until our new server is brought online and the old messages are imported into the new server.
