Ron,
I’ve received several responses with similar recommendations and it appears I will pursue the capacitor array approach. You are also correct, a single capacitor that meets all of the specifications is a rare animal but in an effort to keep this to a minimum size and complexity, I was hoping for a single component solution. After reading some of the responses, the advantages of the capacitor array far outweigh the advantages of a single capacitor solution. In my search, I have located an ample supply of 400V caps for me to tweak and tune in 1700uF and maintain the tolerance and ESR restrictions. Thanks to all who replied. Regards, Steve O'Steen Director, EMC Advanced Compliance Solutions, Inc. sost...@acstestlab.com 770-831-8048 ext. 210 www.acstestlab.com ****************CONFIDENTIAL**************** This e-mail and any attachments may contain information which is confidential, proprietary, privileged or otherwise protected by law. The information is solely intended for the named addressee (or a person responsible for delivering it to the addressee). If you are not the intended recipient of this message, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete it from your computer. ________________________________ From: Ron Pickard, RPQ [mailto:rpick...@rpqconsulting.com] Sent: Sunday, April 05, 2009 1:19 AM To: Steve O'Steen Cc: emc-p...@ieee.org Subject: RE: Peak Inrush Test Fixture Cap Hi Steve, 1700uF is quite a non-standard value. Have you considered connecting in parallel two or more similarly rated capacitors to obtain the 1700uF? You should be able to “dial in” a capacitance very close to 1700uF. Or is it your intention to utilize only a single capacitor? Anyway, IHTH. I look forward to your reply. Best regards, Ron Pickard RPQ Consulting Glendale, AZ 85303 +623.512-3451 tel, +623.848-9033 fax rpick...@rpqconsulting.com www.rpqconsulting.com <http://www.rpqconsulting.com/> www.linkedin.com/in/RonPickard ________________________________ From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Steve O'Steen Sent: Friday, April 03, 2009 10:22 AM To: emc-p...@ieee.org Subject: Peak Inrush Test Fixture Cap All, Does anyone have a source for a 1700uF cap as specified in IEC 61000-4-11, Annex A. I’ve found several capacitors that meet some of the criteria but not all. The parameters are; capacitance, voltage rating, tolerance and ESR. The closest value capacitor I was able to find was 1500uF which met all of the requirements. I had considered purchasing three or four of those, hoping that at least one would run on the high side and measure at 1700 +/- 20%. Obviously, I would prefer to locate a single capacitor with the advertised specifications that meet the requirements per IEC 61000-4-11. Any help would be appreciated. Regards, Steve O'Steen sost...@acstestlab.com <mailto:sost...@acstestlab.com> ****************CONFIDENTIAL**************** This e-mail and any attachments may contain information which is confidential, proprietary, privileged or otherwise protected by law. The information is solely intended for the named addressee (or a person responsible for delivering it to the addressee). If you are not the intended recipient of this message, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete it from your computer. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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