As you are no doubt aware, Solar Electronics is the sole source supplier of CS01/CS101 injection transformers. They make two models, rated at 50 and 100 Amps. I expect you could use any transformer with the right current rating and turns ratio as an injection device over most of the CS101 range.
But I don't think it is necessary. If you are a 150 Amp load on a 115 Volt circuit, the impedance of that circuit is so low it is difficult to imagine how any other load could generate several Volts of ripple. Given that CS101 now extends to 150 kHz, I could perhaps see performing the test from, say, 10 - 150 kHz, where bus inductance could cause some ripple, but where the bus impedance is milliohms this is a misapplied requirement. The design impact of building a brute force LCR filter at CS101 frequencies is considerable, and should only be undertaken to solve real, as opposed to "specsmanship" problems. If anyone has a problem with this line of reasoning, consider that such a heavy load almost certainly has a dedicated feeder straight from the generator. The shared bus impedance between this load and another one that could be causing the ripple is basically the generator itself and the few feet of wiring between the generator and the breaker panel. It is much more likely that this load, if it draws pulsed currents, is loading the generator itself and thus generating ripple than it being affected by other loads. For the exact same reasoning, a 50 uH LISN is inappropriate for measuring conducted emissions. The 5 uH model is more applicable. However, you can only measure emissions from 150 kHz on up with that model. That is fine, you just tailor the 10-150 kHz range into a current limit and measure per CE101 test method. I have done this several times on high current loads. If done correctly, it can save tens of pounds and considerable space in hauling pig iron filters around, which is important if the host platform flies. > From: "Low, Aaron S" <[email protected]> > Reply-To: "Low, Aaron S" <[email protected]> > Date: Tue, 01 Apr 2003 10:23:21 -0500 > To: "'[email protected]'" <[email protected]> > Subject: high current MIL-STD-461E CS101 > > > I would like to know if anyone out there has had any experience with running > CS101 on very high pulsed current devices. > > Our EUT (class AB amplifier) draws > 150 A (115 VAC 400 Hz). I would like > to know what equipment and methods were used. > > On a related note, this equipment cannot be operated with the standard 50 uH > LISN, but a 5 uH LISN cannot be used to measure below 100 kHz. Has anyone > used the voltage probe method defined in the appendix of 461E? > > Thanks > Aaron > Aaron S. Low > Systems Engineer > Naval Electronics and Surveillance Systems > EP5 D5 MD45 Syracuse, NY 13221-4840 > Phone: (315) 456-1203 Fax: (315) 456-0509 > L > > > ------------------------------------------- > 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
