Hi Everyone, Lately I have been working on a desktop "EMP" generator on the cheap for testing circuits and equipment without spending a lot of money. One of the challenges is characterizing and calibrating it without having a suitable current probe. I designed a simple, self calibrating current divider that is easy to build and gives a reduction of 4X per section (any factor is possible using multiple sections and changing the design of the section). The design matches resistive and reactive contributions to the attenuation ratio (extremely simple to do) to give it a nice constant attenuation ratio from DC to higher frequencies. I will cover the design of the attenuator in an upcoming Technical Tidbit on my website www.dsmith.org<http://www.dsmith.org> . My current probe is a F-65 from Fischer Custom Communications. I like that probe as it has excellent E-field rejection. I have seen some others that do not have good E-field rejection and would not work in this application as there are high E-fields involved.
Separately, I am going to cover the design of the overall device and current divider as well as demonstrate it in a segment I am calling "The Morning After" to be given on the Friday morning after my regular three-day measurement and design troubleshooting seminar (next two are in October). Right now, my generator is capable of 5,000+ Amperes (3 MHz damped sinewave but I can make other waveforms) with a 45,000 Volt open circuit output. That is like ESD di/dt but with orders of magnitude more energy. So far I have not spent any money yet! Doug [cid:[email protected]] - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
