Hi group, Here's one for all of you that make products for US military/gov't customers:
I was reviewing MIL-STD-461D (I know, a little late to be commenting at this point) and I noticed that although CS101 in -461D corresponds to CS01 in -461C, there is no counterpart to -461C's CS02 requirement. In other words, the conducted susceptibility test on power leads has been deleted above 50 kHz in -461D. The bulk current injection test (CS114) covers the range up to to 400 MHz, but that is a common mode test, and doesn't necessarily impose the voltage levels that can be present on a power bus above 50 kHz. In my experience, most of the noise that is of concern ranges between 50 kHz, and a few megahertz, especially with the switching frequencies used in today's power supplies. Is anyone else concerned about this? Is there some rationale that supports the -461D version in this regard? There is no discussion on this in the application guide to -461D. I'd be interested in any comments or shared concern out there. Thanks in advance David Brumbaugh The Boeing Company Phantom Works - Electromagnetic Effects M/C 8H-11 POB 3999 Seattle, WA 98124-2499 Phone: 253-773-3733 Pager: 800-759-7243, PIN 5474642# Fax: 253-773-4173 --------- 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).
