Derek, I agree that MIL-STD-704E does not adequately control the ripple source impedance. You are likely going to use your CS01 test set-up, so why not just do that and be done with it - that's what most people with a -461 capability do. Just use the CS01 amp and coupling transformer, but instead of the 0.5 Ohm load, you use a resistor that draws the same current as the test sample.
There is a curve (Fig. 8) in MIL-STD-704E that shows the ripple spectrum for 28 Vdc power from 10 Hz to 500 kHz. Your CS01 set up will work to at least 150 kHz, but I think it is supposed to work to 250 kHz. MIL-STD-704 is a NAVAIR standard. MIL-STD-704F lists the following e-mail contact: [email protected]. Ken Javor > From: "Derek Walton" <[email protected]> > Organization: L F Research > Reply-To: [email protected] > Date: Wed, 25 Apr 2007 15:50:17 -0500 > To: "Ken Javor" <[email protected]> > Cc: [email protected], "'IEEE EMC Discussion Group'" > <[email protected]> > Subject: Re: MIL HBK 704-8 distortion factor > > HI Ken, > > there are a couple of things in these three paragraphs in your email > that still cause me issues: > > I'm tasked with 704E, so F, if its better to use... wont help me, I'm > still stuck. > > The ripple voltage... is this measured with an RMS meter, OR, is it the > root sum of the squares of the components as measured by a spectrum > analyzer? > > The third paragraph is where I'm not sure what the heck these guys were > thinking. The requirement seems to vacillate between setting up the > quality of the power delivered to the EUT so you can determine it > functions OK with the ripple. But then you get the impression that they > are trying to determine what effect the EUT has on bus ripple. > > Setting up the ripple on the power is fairly simple, but it IS power > supply dependent when you switch from the setup resistor to the real EUT. > > Determining the influence of the EUT on the bus ripple is dramatically > influenced by the power supply impedance, BW etc. Non of which is > controlled. > > I guess I'd like to know who I can direct questions to to get "official" > answers... > > Thanks as always Ken for replying! > > Cheers, > > Derek. > > > Ken Javor wrote on 4/25/2007, 3:01 PM: > >> >> Prefacing my comments by saying I am not familiar with the latest >> MIL-STD-704 (I think it is "F"). >> >> In "D" and "E" voltage distortion is the ratio of the ripple voltage >> (rms) >> to the rms power waveform voltage, in your case, 28 Vdc. >> >> If I am going to measure the load-induced effect on power quality, I >> have to >> have one of two set-ups. > > > -- > Derek N. Walton > Owner L F Research > www.lfresearch.com > Phone: (815) 566 5655 > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
