I think you make an apples to oranges comparison. The one watt rating is for cw, not pulse. A carbon composition resistor should be OK at 5 watts pulse. A couple of caveats.
1. Do not use wirewound resistors. (Magnetostrictive action will explode them.) 2. Do not use metal film, carbon film or any other laser trimmed types. (Power distributes unevenly) 3. Keep the duty cycle at 1% or less. Fred Townsend "HARDMAN, BRYAN" wrote: > Hello All, > > I have a request from the design community to implement a routine impulse > test in lieu of a Hi-Pot test. This product is evaluated to 61010-1 and the > reason for the request is that a measuring circuit connected to the affected > output circuit contains a resistor string that cannot withstand the power > delivered by the Hi-Pot test [4.6 kVdc across a mom resistor = 4.2 Watts. > (this is greater than the 1 Watt resistor rating)]. > > Anyone have experience replacing routine Hi-Pot testing with impulse > testing? > > Bryan Hardman > Advanced Energy > 970 407 6617 > > _______________________________________________________________ > This message, including any attachments, may contain information > that is confidential and proprietary information of Advanced > Energy Industries, Inc. The dissemination, distribution, use > or copying of this message or any of its attachments is > strictly prohibited without the express written consent of > Advanced Energy Industries, 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: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > Archive is being moved, we will announce when it is back on-line. > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc 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: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
