Chuck,
Your email brought up a point that I hadn't considered: i.e. variability of ESR
causing unequal division of ripple current, thus overloading one capacitor.
I can see the reasoning for using the equalizing resistors (ensuring that the
ripple currents balance across the paralleled
Hello,
If you want to know more about HALT and HASS, obtain a copy of Accelerated
Reliability Engineering by Gregg K. Hobbs, John Wiley Sons Ltd., ISBN
0-471-97966-X.
Regards,
+=+
|Ronald R. Wellman|Voice :
HALT - Highly Accelerated Life Testing
HASS - Highly Accelerated Stress Screen
http://www.ptitest.com/halt_hass.htm
These are basically abuse the product to find the weak spots, fix them, and
save the manufacturer their profit margin by significantly reducing their
warranty costs.
Hope this
Hi all,
Paralleling low-esr capacitors is a little scairy. With 8 caps in
parallel and each allotted its maximum ripple current, one capacitor,
theoretically, could conduct 8 times its allowable rating! This, of
course, is the theoretical limit---all other caps would have to be
open.
That's a
I agree with Rich on the moral obligation a
company has to avoid injury to those who
use its products.
Every year I give a lecture on Product Safety
to manufacturing engineering students at our
local university. This is what I say in answer to
Why have Product Safety ? -
As well as the
Geez, just jump to Google. HALT- misnamed: Highly Accelerated Life Testing.
Actually has noting to do with Life-time or MTBF-type longevity analysis.
Look at the Calmer web site; they were one of the pioneers of HALT. Also, GM
has published an engineering standard, GMW8287, that provides a
Hello Peter,
There is a company in Denver, CO, called Qualmark who should be able to
answer your questions.
Regards
Doug
Peter Merguerian pmerguer...@itl.co.il@majordomo.ieee.org on 07/31/2002
06:38:21 AM
Please respond to Peter Merguerian pmerguer...@itl.co.il
Sent by:
Dear All,
1. Has anyone heard of HALT and HAAS?
2. What are some overseas labs (in Europe, North America and Asia) testing
for HALT and HAAS?
3. What does a manufacturer testing to HALT and HAAS gain?
This e-mail message may contain privileged or confidential information. If
you are not the
It has been some time since I have had to explain
or justify product safety activity to a high-level
manager-type. As others have said, it is fraught
with difficulties.
Success depends on first determining the mindset
of the person asking the question. I believe I
would first ask a
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