RE: Reliability recommended books

2001-11-26 Thread Matt Kilkenny 


First thing is you need to decide what you are trying to accomplish and it
eventually gets into philosophies about reliability.  If you are trying to
measure reliability some of the good books are: Pat O'Connor's Practical
Reliability Engineering which is a good intro book; Finn Jensen's
Electronic Component Reliability which is excellent also. Handbook of
Reliability Engineering and Management is a good reference book to have on
the shelf.

We could spend hours on this discussing the disadvantages of trying to
measure reliability in the Mil-STD 217 parts count methods and the
variations of it that are out there, the controversies of the Arrhenius
equation for temp. aging effect in the parts count method, etc.  Of course
this isn't the approriate forum. =) 

Matthew Kilkenny
Reliability Engineer 
mkilke...@opthos.com




 
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Re: Quality Assurance and Product Approvals

2001-11-26 Thread Rich Nute 




Hi Alan:


   Two questions, does the group see a time when we have a VP Compliance on 
   level terms with VP Finance, VP Marketing etc, or is this already 
   happening in the US.

No.  And not likely to happen in companies with ordinary
products.

As a general rule, compliance is seen as a necessary
evil.  It is a cost without an associated revenue (or 
customer-recognized need or benefit).  Few companies 
want to give VP status (and an empire) to a non-revenue-
generating function.

Many companies measure the product incremental cost for
compliance.  The objective is to find methods and means
for minimizing these product costs.  

Furthermore, few companies recognize the work of compliance
folks as prevention of future unanticipated costs such as
failure of sales due to non-compliance, product liability, 
or even product recalls.  The reason the work is not 
recognized is the difficulty of measuring the future cost of 
non-compliance, especially if the company has never had such 
an incident.

   Second Question. Does the group think a formal qualification in 
   Compliance Management  CE Marking would be a good idea.

While we may think this is a good idea, most professional
managers in the field of compliance consider the job as one
interim step in their career.  If compliance is a non-
revenue-generating activity, then the step to personal 
growth is to measure the cost of compliance for the duration 
of one's leadership, and add this to one's CV.  Then, move 
on.

Candidates for compliance management might find courses 
useful. However, the value of such qualifications is not 
for the long term.  

Another problem is that upper management doesn't want to be 
told that they are restricted by compliance rules insofar as
setting objectives for the products and the company.  They
certainly don't want to feel that the only management folks
qualified for managing a compliance function are those that
are trained and qualified in compliance management.

Formal qualification in compliance management may be seen by
upper management as a power play where the compliance 
manager uses his knowledge to gain some degree of control 
over other managers.  

If formal qualification in compliance management is 
principally that of methodology for measuring and reducing
cost of compliance, then I would think this would be a
very good idea.


Best regards,
Rich




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RE: Reliability recommended books

2001-11-26 Thread Hare, Paul 

I second that recommendation.  I also have the solutions for the exercises
in chapters two through sixteen if anyone is interested.  Email me directly
and I'll forward them to you...

Paul Hare   e: ph...@pirus.com
Compliance Engineer w: 978.206.9179
Pirus Networks  f: 978.206.9199
43 Nagog Park   c: 508.450.0376
Acton, MA 01720 i: www.pirus.com


-Original Message-
From: acar...@uk.xyratex.com [mailto:acar...@uk.xyratex.com]
Sent: Monday, November 26, 2001 8:49 AM
To: Carmen.Filimon
Cc: 'emc-p...@majordomo.ieee.org'
Subject: Re: Reliability recommended books



Carmen

I find Reliability and Maintainability Engineering by Charles E. Ebeling
(ISBN 0-07-018852-1) as a very useful hand
book. The maths gets a little scary at times, but the technical scope is
spot on.



Carmen.Filimon wrote:

 Hello group,

 I' m interested to get feedback from the experts who are involved in
 Reliability field, regarding the best/most efficient design reliability
 technical books.

 Regards,

 Carmen Filimon
 Leitch Canada

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Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014



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Free Mil-Hdbk-338B Re: Reliability recommended books

2001-11-26 Thread paul_j_smith 


Carmen,

The Mil-Hdbk-338, rev B  ELECTRONIC RELIABILITY DESIGN plus base document
is available free at website
http://astimage.daps.dla.mil/quicksearch/

Your taxes already paid for it.


ASSIST-QuickSearch
   FSC/Area Title Document Number Document ID
ASSIST-Quick Search provides direct access to nearly
   100,000 full text DoD Specifications and
Standards available in the DoD master repository - ASSIST!



Revision History

Document ID:  MIL-HDBK-338B
   Title:ELECTRONIC RELIABILITY DESIGN
 Scope:  Scope information has not been recorded for 
this document
  Document Date:October 01, 1998
   FSC/Area:  SESS -
  Prep Acty:  11 - Aeronautical Systems Center


 Document Status:  Active

 Media  Document Part Description   Part Status 
  Size

Base Document   
Historical458  Pages
  39356.6 KB

Change Notice 1 
Historical1 Pages
  58.9 KB

Revision B   Current
   1046Pages  4671.7
KB

The Usual disclaimers apply.

Paul J. Smith,  Teradyne, Boston





douglas_beckw...@mitel.com@majordomo.ieee.org on 11/26/2001 10:10:22 AM

Please respond to douglas_beckw...@mitel.com

Sent by:  owner-emc-p...@majordomo.ieee.org


To:   Carmen.Filimon carmen.fili...@leitch.com
cc:   'emc-p...@majordomo.ieee.org' emc-p...@majordomo.ieee.org

Subject:  Re: Reliability recommended books





From:  Douglas Beckwith@MITEL on 11/26/2001 10:10 AM
Hi Carmen,
There are a couple of good sources. Mil-Hdbk-338 has some very good design
prinicples. Rome Air Development Center (RADC) produce a very useful
reliability
handook, have a look on their website. Another book that I have found very
useful is Practical Reliability Engineering by Patrick D.T. O O'Connor.

Regards

Doug Beckwith
Mitel Networks



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RE: Reliability recommended books

2001-11-26 Thread Chris Maxwell 

The former Rome Air Development Center is just down the road from here.
I just wanted to point out that their name was changed to Rome Labs
during the 90's.  So, if you don't have any luck with RADC or Rome Air
Development Center, try Rome Labs.  They also have a spin-off dedicated
to reliability called the RAC or Reliability Analysis Center.

Happy hunting.

Chris Maxwell | Design Engineer - Optical Division
email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797
8024

NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA
web www.nettest.com | tel +1 315 797 4449 | 




 -Original Message-
 From: douglas_beckw...@mitel.com [SMTP:douglas_beckw...@mitel.com]
 Sent: Monday, November 26, 2001 10:10 AM
 To:   Carmen.Filimon
 Cc:   'emc-p...@majordomo.ieee.org'
 Subject:  Re: Reliability recommended books
 
 
 
 
 From:  Douglas Beckwith@MITEL on 11/26/2001 10:10 AM
 Hi Carmen,
 There are a couple of good sources. Mil-Hdbk-338 has some very good
 design
 prinicples. Rome Air Development Center (RADC) produce a very useful
 reliability
 handook, have a look on their website. Another book that I have found
 very
 useful is Practical Reliability Engineering by Patrick D.T. O
 O'Connor.
 
 Regards
 
 Doug Beckwith
 Mitel Networks
 
 
 
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Re: Near field vs far field

2001-11-26 Thread Ken Javor 

A much simpler answer is that as long as source (EUT) is small relative to
separation and separation is long relative to a wavelength then  1/r scaling
is fairly accurate, but if those conditions are not met scaling for another
distance cannot be performed.  My earlier posting on this subject
incorrectly made the antenna short relative to a wavelength.  That
requirement is only necessary in microwave bands with highly directional
antennas, not below a GHz where we use low gain antennas.

on 11/26/01 5:01 AM, CE-TEST at cet...@cetest.nl wrote:

 
 Hi
 
 The transition from near to far field is very complex.
 It depends on the source of the radiation.
 If the source is electric field (voltage/air capacitor/small dipole)
 is has 3 vector components all at right angles of each other of which 2 are
 electric
 and one is magnetic. To make it more complex each of the 3 vectors
 have another relation ship with the distance : 1/r3 (E)  1/r2 (H) and 1/r
 (E).
 
 If the source is dominantly magnetic (small current loop or piece of wire
 carrying current)
 then the same reasoning as above exists but with magnetic and electric field
 terms exchanged.
 
 To discourage you completely: most sources are of a mixed character ! ;))
 
 Good information of this can be found in books such as
 Goedbloed 's that actually lists out the formula's in a
 easy form.
 
 For emc measurements we are mainly concerned with the 1/r terms
 because the others die out faster when the distance rises.
 
 
 Regards,
 
 Gert Gremmen
 
 -Original Message-
 From: owner-emc-p...@majordomo.ieee.org
 [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of
 am...@westin-emission.no
 Sent: maandag 26 november 2001 13:15
 To: emc-p...@majordomo.ieee.org
 Subject: Near field vs far field
 
 
 
 Hi all,
 
 CASE:
 We measure radiated emission on a 21 PC monitor inside a semi-anechoic
 chamber.
 
 In a 3m distance we measure 30dBuV/m at 30MHz
 
 What value could we expect at 1m distance ?
 
 I'm not asking for the correct dBuV/m value..., but what really happens when
 we go so far into the object near field ?
 
 Does it exist a kind of empiric equation which roughly can give us a number
 ?
 
 Please, if you have an links to the Web-articles about near-far fields
 effects, I would like to know.
 
 Best regards from
 Amund Westin in sunny Oslo/Norway
 
 
 
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RE: Reliability recommended books

2001-11-26 Thread Ehler, Kyle 
Try this:
http://www.google.com/search?q=MTBFbtnG=Google+Search

Google is my favorite search engine.  No rubbish.
Regards,
kyle

Frame Surge Test

2001-11-26 Thread Mark Pascarelli 


Hi all,

I am trying to re-design our current power supply to meet GR-1089-Core
Specification.
The Power Supply has a -48V input and 5VDC/100W, 5VDC/100W and 12VDC/150W
Output.

Based on current testing, we did not comply with Section 9.10.6 Frame Surge
Test.
This test applies a surge current as defined in IEEE C62.41.  The filter
capacitor was destroyed during this test. The capacitor is rated at 100V.  I
think this capacitor should be replaced with a higher voltage X or Y
capacitor.  Possibly a GDT or TVS is required.

If anyone can help, I will email a portion of the schematic in PDF format. 

Thank you,

Mark Pascarelli
Electrical Engineer
Carlo Gavazzi, Inc.

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RE: Notified Body Question

2001-11-26 Thread David_Sterner 

1) You can check the list of notified bodies to verify the NB listing.

2) The lab was probably accredited to EN45001 when it was valid.
Accrediting bodies are transferring accreditations from 45001 and ISO Guide
25 to IEC/ISO/EN17025 but an 'upgrade' is not automatic, nor did it begin
with the demise of EN45001.  Accrediting bodies needed time to prepare
materials and a programme for 17025.  Also the test lab may have old cover
pages and pre-printed certificates to use up.

3) If the report was issued before or during the transition of accreditation
from EN45001, the lab cannot yet claim 17025.  However if they are listed
with an authorized 17025 accrediting body, they should be using very similar
controls for competency of personnel and accuracy of reports.   One US
accreditor allows 1 year for an accredited lab to calculate its EMC
uncertainty;  accredited labs may have unresolved deficiencies. 

I recommend you e-mail the lab to affirm the status of changeover to 17025.

David

-Original Message-
From: Enci [mailto:e...@cinepower.com]
Sent: Monday, November 26, 2001 8:42 AM
To: emc-p...@majordomo.ieee.org
Subject: Notified Body Question



Hi,

I have a Notified Body test report that states the following:
This report is in conformity with EN45001. 

Question 1) Is this an official report produced by the Notified Body as a
Notified Body?
In other words, can I use it in my TCF as a Notified Body test report, as
it has a higher status that a ordinary test report by another laboratory? 

The date of the report is June 2000. EN 45001 was withdrawn on the 15 May
2000 and replaced with EN 17025.

Question 2) Assuming the answer to question 1 is YES, is the report still
valid ?


Thank you for your help.

Enci



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Looking for HP 8566B for a friend

2001-11-26 Thread Michael Taylor 
I have been asked by a friend if I could help him locate a HP 8566B in good
working condition.   He is not in a position to pay the stratospheric
prices asked by a couple of big name dealers but can make an immediate deal
for a reasonable price.   If anyone has - or knows of - a nice example at a
reasonable price please contact me off line so I can put them in direct
contact with the buyer.  Just trying to help out a friend - not involved in
the transaction in any way.  No flaming emails please.

Thanks and best wishes to all for a wonderful holiday season.
Michael Taylor.
mtay...@hach.com
or
970-663-1377 ext 2646

question on p-static testing of electronics

2001-11-26 Thread shbeard 

Can anyone point me to a standardized test procedure for measuring the
effects of p-static discharge affecting antenna connected receivers?

Thanks,
Susan Beard


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Re: definition of off

2001-11-26 Thread Ed Eszlari 


UL and TUV will accept an amplifer mute and display turn off as an off condition as long as it is done without human intervention at the time of switching, no input power requirement. CSA will not, and has stated that the product should either be disconnected from the mains or the secondary circuitry shall be disconnected and the input power in the off state shall be less than 15W.
Ed


From: "Lou Aiken" 
Reply-To: "Lou Aiken" 
To: "Colgan, Chris" , "'Emc-Pstc' (E-mail)" 
Subject: Re: definition of "off" 
Date: Thu, 22 Nov 2001 12:37:23 -0600 
 
According to my understanding of 950, which is much better than 65, I believe a product must be safe, "within the meaning of the standard" during unattended operation and also when unattended in so-called "off" mode. 
 
Consequently, the status of the product when in the off mode, should be determined by the manufacturer, and the safety authorities should show little interest. 
 
Regards, Lou 
 
Lou Aiken 
27109 Palmetto Drive 
Orange Beach, AL 
36561 USA 
tel +1 251 981 6786 
fax +1 251 981 3054 
mobile +1 251 979 4648 
 - Original Message - 
 From: Colgan, Chris 
 To: 'Emc-Pstc' (E-mail) 
 Sent: Thursday, November 22, 2001 8:20 AM 
 Subject: definition of "off" 
 
 
 
 What is clear from IEC60065 is that if a product is capable of being 
 switched on or off or both by a timer or a data link, a front panel 
 mechanically operated switch is not required. What is not clear is the 
 definition of off. 
 
 Has anyone been given a definition, preferably by a CTL member or the like? 
 
 Cheers 
 
 Chris Colgan 
 Compliance Engineer 
 TAG McLaren Audio Ltd 
 The Summit, Latham Road 
 Huntingdon, Cambs, PE29 6ZU 
 *Tel: +44 (0)1480 415 627 
 *Fax: +44 (0)1480 52159 
 * Mailto:chris.col...@tagmclaren.com 
 * http://www.tagmclaren.com 
 
 
 
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 Please visit us at www.tagmclaren.com 
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 Telephone : 01480 415600 (+44 1480 415600) 
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Notified Body Question

2001-11-26 Thread Enci 

Hi,

I have a Notified Body test report that states the following:
This report is in conformity with EN45001. 

Question 1) Is this an official report produced by the Notified Body as a
Notified Body?
In other words, can I use it in my TCF as a Notified Body test report, as
it has a higher status that a ordinary test report by another laboratory? 

The date of the report is June 2000. EN 45001 was withdrawn on the 15 May
2000 and replaced with EN 17025.

Question 2) Assuming the answer to question 1 is YES, is the report still
valid ?


Thank you for your help.

Enci



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RE: Near field vs far field

2001-11-26 Thread CE-TEST 

Hi

The transition from near to far field is very complex.
It depends on the source of the radiation.
If the source is electric field (voltage/air capacitor/small dipole)
is has 3 vector components all at right angles of each other of which 2 are
electric
and one is magnetic. To make it more complex each of the 3 vectors
have another relation ship with the distance : 1/r3 (E)  1/r2 (H) and 1/r
(E).

If the source is dominantly magnetic (small current loop or piece of wire
carrying current)
then the same reasoning as above exists but with magnetic and electric field
terms exchanged.

To discourage you completely: most sources are of a mixed character ! ;))

Good information of this can be found in books such as
Goedbloed 's that actually lists out the formula's in a
easy form.

For emc measurements we are mainly concerned with the 1/r terms
because the others die out faster when the distance rises.


Regards,

Gert Gremmen

-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of
am...@westin-emission.no
Sent: maandag 26 november 2001 13:15
To: emc-p...@majordomo.ieee.org
Subject: Near field vs far field



Hi all,

CASE:
We measure radiated emission on a 21 PC monitor inside a semi-anechoic
chamber.

In a 3m distance we measure 30dBuV/m at 30MHz

What value could we expect at 1m distance ?

I'm not asking for the correct dBuV/m value..., but what really happens when
we go so far into the object near field ?

Does it exist a kind of empiric equation which roughly can give us a number
?

Please, if you have an links to the Web-articles about near-far fields
effects, I would like to know.

Best regards from
Amund Westin in sunny Oslo/Norway



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Near field vs far field

2001-11-26 Thread amund 

Hi all,

CASE:
We measure radiated emission on a 21 PC monitor inside a semi-anechoic
chamber.

In a 3m distance we measure 30dBuV/m at 30MHz

What value could we expect at 1m distance ?

I'm not asking for the correct dBuV/m value..., but what really happens when
we go so far into the object near field ?

Does it exist a kind of empiric equation which roughly can give us a number
?

Please, if you have an links to the Web-articles about near-far fields
effects, I would like to know.

Best regards from
Amund Westin in sunny Oslo/Norway



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test message only

2001-11-26 Thread John Woodgate 

I saw no traffic over the last few days, so I need to see if this
message is rejected.
-- 
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk 
After swimming across the Hellespont, I felt like a Hero. 

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