Ed, The automotive EMC / Power Quality testing community use Techron 7700 series DC Coupled audio amplifiers for the type of test you are talking about. They can supply typically either 100V or 100A. They can ramp in typically 50 µs depending on what the ramp amplitude is. We also use these for 28 V DC aircraft power quality tests. I hope this helps. Luke Turnbull Dr Luke Turnbull EMC Technical Manager TRW Conekt Stratford Road Solihull West Midlands B90 4GW
Tel: +44 (0)121.627.3966 Mobile: +44 (0)7730.671284 Fax: +44 (0)121.627.4353 email: [email protected] web: www.conekt.net >>> "Price, Edward" <[email protected]> 01 December 2008 17:03 >>> I would like to get a modest capability to do some of the ramped power quality tests defined in MIL-STD-704. Typically, I would want to be able to apply various DC voltage inputs to a test specimen, and then slew those voltages following the typical dV/dT requirements. Typical exposures might be 28 VDC for 30 seconds, then ramping to 50 VDC in 10 milliseconds, holding 50 VDC for 5 seconds, then ramping to 12 VDC in 40 milliseconds, etc. The problem I have is that all of my power supplies are too slow to track the ramps, and even when they get close, I am seeing capacitor charge/discharge curves rather than straight ramps. So I have been thinking that maybe what I want is a DC coupled amplifier. Perhaps one possibility is the automotive aftermarket, where those rude idiots buy those thousand watt boom boxes that they use to rattle my house when they drive past. I think they now use Class D switchers for those amplifiers. Does anyone have any suggestions about where I might look? Ed Price [email protected] <blocked::mailto:[email protected]> WB6WSN NARTE Certified EMC Engineer & Technician Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (FAX) Military & Avionics EMC Is Our Specialty - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> Conekt is a trading division of TRW Limited Registered in England, No. 872948 Registered Office Address: Stratford Road, Solihull B90 4AX - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
