Richard, As someone who is presently working on a project to build surge coupling networks for Bellcore testing, I'll throw in my two cents worth:
Successfully designing, building and testing these CDNs is a much more involved task than it would seem. The components required are usually custom made with minimum order quantities and long delivery times. There is always a compromise between the proper treatment of high voltage and minimizing stray inductances with the resulting resonances. It is possible to save money on the components alone but when you include all the engineering time to complete such a task, you can't really save money plus you are left with the responsibity of service and calibration. I don't want to discourage you entirely. If you have lot's of time and resources available it can be accomplished, I just want you to be aware of the trade-offs. Some of the commercial networks do offer value for the money even though they may seem pricy. You should look for models that have "auxiliary equipment protection" and switching of test modes built in. If you'd like more specific recommendations, please contact me directly. Greg Senko EMC Consulting Services, Inc. TEL: 603-642-7975 FAX: 603-642-7975 [email protected] www.tiac.net/users/gsenko -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of WOODS, RICHARD Sent: Monday, March 22, 1999 1:25 PM To: 'emc-pstc' Subject: Surge Test Equipment When testing I/O lines to EN61000-4-5, a coupling/decoupling network is used. One type of network is specified for unbalanced lines and one for balanced lines (figs. 10 & 12). Commercial networks are available for $10,000 to cover both types of circuits. OUCH! Has anyone successfully built their own networks for a much more reasonable cost? If so, what are the brand and part numbers/families of the inductors, resistors, capacitors and spark gaps? Did you have to use any special high voltage design techniques? The standard indicates that "protection equipment" is inserted between the decoupling network and the auxiliary equipment, but there is no indication of its design. What are you using? --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
