Re: Crest Factor

2003-06-13 Thread Robert Macy 

I use 3, with 10 as worst case.  

  - Robert -

   Robert A. Macy, PEm...@california.com
   408 286 3985  fx 408 297 9121
   AJM International Electronics Consultants
   101 E San Fernando, Suite 402
   San Jose, CA  95112


- Original Message - 
From: rehel...@mmm.com
To: emc-p...@majordomo.ieee.org
Sent: Friday, June 13, 2003 3:57 AM
Subject: Crest Factor


 
 I'm trying to spec a power supply. Can someone provide me with a typical
 crest factor that a typical power supply should be able to source without
 distortion.?
 
 Thanks,
 Bob Heller
 3M EMC Laboratory, 76-1-01
 St. Paul, MN 55107-1208
 Tel:  651- 778-6336
 Fax:  651-778-6252
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RE: Crest Factor

2003-06-13 Thread Brian O'Connell 
I do not understand source without distortion. Is this in reference to
conducted emissions (i.e., 61000-3-2), or conducted immunity?

In any case, I am not aware of any typical specification for crest factor,
and am not certain that this metric is applicable to modern component power
supplies. 

Surges and transients, as specified by the GR-CORE, IEC61000-4-x, and other
standards define mains input immunity requirements. Quote a standard/clause
that must be met in order to survive the intended end-use; do not require the
supplier to nail jelly to a tree...

my opinions only. 

luck, 
Brian 

-Original Message- 
From: rehel...@mmm.com [ mailto:rehel...@mmm.com] 
Sent: Friday, June 13, 2003 3:57 AM 
To: emc-p...@majordomo.ieee.org 
Subject: Crest Factor 

I'm trying to spec a power supply. Can someone provide me with a typical 
crest factor that a typical power supply should be able to source without 
distortion.? 

Thanks, 
Bob Heller

Crest Factor

2003-06-13 Thread rehel...@mmm.com 

I'm trying to spec a power supply. Can someone provide me with a typical
crest factor that a typical power supply should be able to source without
distortion.?

Thanks,
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel:  651- 778-6336
Fax:  651-778-6252
===



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