RE: Cat 3 vs. Cat 5

[Jacob Ben-Ary]

Hello,
The two cables are for LAN connections. Cat3 has bandwidth of 16 MHz,
cat5 has 100 MHz. The LAN cables in this time are per Cat5e or Cat6.
You can find information in:
http://www.connectworld.net/c1.html
Regards
Jacob

-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of Reginald Henry
Sent: Tuesday, February 19, 2002 9:40 PM
To: emc-p...@majordomo.ieee.org
Subject: RE: Cat 3 vs. Cat 5



Hello Group,

Can anyone direct me toward a site that will give me information about 
the industry standard  concerning the twist per inch  for the
different categories of Network Cable wires

i.e. Cat 3 vs. Cat 5 ?


Thanks,

Reg

-Original Message-
From: Colgan, Chris [mailto:chris.col...@tagmclaren.com]
Sent: Thursday, February 07, 2002 11:43 AM
To: emc-p...@majordomo.ieee.org
Subject: RE: Immunity Standards



Very good point!

Chris

 -Original Message-
 From: John Woodgate [SMTP:j...@jmwa.demon.co.uk]
 Sent: 07 February 2002 11:03
 To:   emc-p...@majordomo.ieee.org
 Subject:  Re: Immunity Standards
 
 
 I read in !emc-pstc that Colgan, Chris chris.col...@tagmclaren.com 
 wrote (in AE0F4BD08FEAD211895900805FE67B1F01090EE7@CAT) about 
 'Immunity Standards', on Thu, 7 Feb 2002:
 If your question is what are the differences? the answer is 
 considerable.  It is beyond the scope of this forum to list the 
 differences, I'm afraid you will have to purchase copies of the
 standards.
 
 I don't see that the OP needs to purchase the long-superseded 1992 
 version. It would be better to purchase EN61000-6-1!
 --
 Regards, John Woodgate, OOO - Own Opinions Only.
 http://www.jmwa.demon.co.uk 
 After swimming across the Hellespont, I felt like a Hero.
 PLEASE do NOT copy news posts to me by E-MAIL!
 
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RE: Chamber Doors

[Hare, Paul]

Are you sure?  Berylium Oxide (BeO) has a long-standing reputation for
being
toxic, but I've never heard of metalic berylium (Be) posing a problem.

See the following for more details:
http://www.atsdr.cdc.gov/tfacts4.html

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: plaw...@west.net [mailto:plaw...@west.net]
Sent: Tuesday, February 19, 2002 12:07 PM
To: EMC-PSTC
Subject: Re: Chamber Doors



On Tue, 19 Feb 2002 18:08:09 +0800, Wan Juang Foo f...@np.edu.sg wrote:
snip
BTW, 'Be' (Beryllium) is a highly toxic metal that will not get out of your
blood once it enters it.  I would strongly advise anyone cleaning their
Be-Cu finger stocks from exposing themselves to any possibilities of cuts
or abrassions while cleaning these 'fingers'.
I understand the concentrations of Be is low but why would anyone take the
risk of prolonged exposure to Be dust and metal chippings?
snip
Are you sure?  Berylium Oxide (BeO) has a long-standing reputation for being
toxic, but I've never heard of metalic berylium (Be) posing a problem.

Patrick Lawler
plaw...@west.net

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RE: Cat 3 vs. Cat 5

[Reginald Henry]

Hello Group,

Can anyone direct me toward a site that will give me information about  the
industry standard  concerning the twist per inch  for the different
categories of Network Cable wires

i.e. Cat 3 vs. Cat 5 ?


Thanks,

Reg

-Original Message-
From: Colgan, Chris [mailto:chris.col...@tagmclaren.com]
Sent: Thursday, February 07, 2002 11:43 AM
To: emc-p...@majordomo.ieee.org
Subject: RE: Immunity Standards



Very good point!

Chris

 -Original Message-
 From: John Woodgate [SMTP:j...@jmwa.demon.co.uk]
 Sent: 07 February 2002 11:03
 To:   emc-p...@majordomo.ieee.org
 Subject:  Re: Immunity Standards
 
 
 I read in !emc-pstc that Colgan, Chris chris.col...@tagmclaren.com
 wrote (in AE0F4BD08FEAD211895900805FE67B1F01090EE7@CAT) about
 'Immunity Standards', on Thu, 7 Feb 2002:
 If your question is what are the differences? the answer is
 considerable.  It is beyond the scope of this forum to list the
 differences, I'm afraid you will have to purchase copies of the
 standards.
 
 I don't see that the OP needs to purchase the long-superseded 1992
 version. It would be better to purchase EN61000-6-1!
 -- 
 Regards, John Woodgate, OOO - Own Opinions Only.
 http://www.jmwa.demon.co.uk 
 After swimming across the Hellespont, I felt like a Hero.
 PLEASE do NOT copy news posts to me by E-MAIL!
 
 ---
 This message is from the IEEE EMC Society Product Safety
 Technical Committee emc-pstc discussion list.
 
 Visit our web site at:  http://www.ewh.ieee.org/soc/emcs/pstc/
 
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Telephone : 01480 415600 (+44 1480 415600)
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**  
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SV: Industrial Locations

[amund]

I only have the generic EN50082-2 (immunity) and EN50081-2 (emission)
standards, so I quote the description of locations from these standards:
QUOTE start
Industrial locations are characterized by the existence of one or more of
the following conditions:
- industrial, scientific and medical apparatus are present
- heavy inductive or capacitive loads are frequently switched
- current and associated field are high
These are the major contributors to the industrial electromagnetic
environment and as such distinguish the industrial from other environments.
QUOTE end

There are no other industrial examples in these generic standards.

Amund, Oslo/Norway


-Opprinnelig melding-
Fra: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]På vegne av
richwo...@tycoint.com
Sendt: 19. februar 2002 15:45
Til: emc-p...@majordomo.ieee.org
Emne: Industrial Locations



Do the Generic emission and immunity ENs for industrial locations provide
examples of those locations? If so, I would appreciate someone providing the
list of the example locations. I need to compare them against the examples
of light-industrial locations. Thanks in advance.


Richard Woods
Sensormatic Electronics
Tyco International


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RE: EN61000-6-2

[Sam Wismer]

Hi Gert,
Thanks for the reply.  EN61000-6-2 calls EN61000-4-6, so I was
indirectly referencing that standard.  I neglected to apply the
equations of section 6.4.1 as pointed out to me by Brian Kunde.  My
thanks to him and to you for your offer.  
 
 
Kind Regards,
 
 
Sam Wismer
Engineering Manager
ACS, Inc.
 
Phone:  (770) 831-8048
Fax:  (770) 831-8598
 
Web:  www.acstestlab.com
 
-Original Message-
From: Gert Gremmen : ce-test, qualified testing
[mailto:g.grem...@cetest.nl] 
Sent: Tuesday, February 19, 2002 1:46 PM
To: Sam Wismer; EMC Forum
Subject: RE: EN61000-6-2
 
Hi Sam,
 
I do not understand how an attenuator may alter the impedance level of
the CDN output so as
to create a high VSWR ?  The measuring receiver has 50 Ohms in, and
adding an attenuator won't change that ?
 
Do you calibrate  for impedance  level, or for voltage transfer  into
150 Ohms environment ?
 
BTW the standard you need is EN 61000-4-6 !
 
If you want to call me in the netherlands on +31 10 415 2426 
 
Gert gremmen
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Sam Wismer
Sent: dinsdag 19 februari 2002 17:52
To: EMC Forum
Subject: EN61000-6-2
Hi Group,
EN 61000-6-2 calls for severity level 3, or 10Vrms for conducted
disturbances.  This equates to 37dBm which is 7dB higher than the upper
limit my receiver will handle (during calibration of the CDN).  I've
tried to use an attenuator and compensate for it in my readings, but
this creates a high VSWR.  Any ideas how to extend the dynamic range of
my receiver without causing high VSWR?
 
 
Kind Regards,
 
 
Sam Wismer
Engineering Manager
ACS, Inc.
 
Phone:  (770) 831-8048
Fax:  (770) 831-8598
 
Web:  www.acstestlab.com
 

Re: Resistors pulse loading capabilities

[Doug McKean]

Massimo, 

Just to underscore what others have stated, long ago in one 
of the resistor mfr's catalogues, there was a discussion of 
this topic.  Essentially, do not violate the DC wattage 
rating of the resistor based on a 1 second time period. 

As an example, a 1W, 1 Ohm, carbon composition resistor 
should be able to handle 

a. 1A (or 1V potential) continuously, 
b. 2A (or 2V potential) at 50% duty cycle, i.e. 1/2 second duration, 
c. 4A at 25% duty cycle, i.e. 1/4 second duration, 
etc ... 
all the way up to the maximum voltage rating of the resistor. 
For a 600V rated resistor, this would mean the maximum 
pulse allowed would be 600V peak for less than or equal 
to 1/600th second or 1.6 milliseconds. This particular 
conclusion I have doubts about.  I explain below. 

Fusing characteristics of wires is non-linear and therefore 
for large currents through a resistor (I don't know what 
that might be), I doubt the above.  But for low currents, 
let's say less than 10 times the current rating of the resistor 
for the sake of argument (in the case above, that would 
mean anything less than 10 amps), I think that's acceptable. 
This is all spectulation and I am by no means an expert. 

But, if there is any question, please consult the mfr. 

- Doug McKean 



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RE: Chamber Doors

[Robert Wilson]

With regards to beryllium fingers, they are not beryllium. They are an
alloy of copper and beryllium, with the standard C17000 alloy containing
only 1.7% beryllium. 

There is no danger in simply handling these fingers. To be sure, there
is a danger in breathing in dust from machining actual beryllium. This
danger is less for Be-Cu alloy (owing to the low beryllium content). But
this is not particularly relevant here because it is unlikely that any
operation will be carried out that can create any significant beryllium
dust when simply cleaning Be-Cu fingers. Further, these fingers are
generally plated with another metal to eliminate poor contact due to
tarnishing or corrosion, so one is generally not even touching the Be-Cu
alloy at all.

Bob Wilson
TIR Systems Ltd.
Vancouver.

-Original Message-
From: Wan Juang Foo [mailto:f...@np.edu.sg] 
Sent: February 19, 2002 2:08 AM
To: ieee pstc list 
Subject: Re: Chamber Doors




The other problem could be that whoever build the chamber did not make
the door.  They buy it off from someone else and the warranty is only
one year.
:-)  One year seems to be reasonable period considering that there is a
number of things that can go wrong with moving parts that are constantly
held under pressure.

BTW, 'Be' (Beryllium) is a highly toxic metal that will not get out of
your blood once it enters it.  I would strongly advise anyone cleaning
their Be-Cu finger stocks from exposing themselves to any possibilities
of cuts or abrassions while cleaning these 'fingers'. I understand the
concentrations of Be is low but why would anyone take the risk of
prolonged exposure to Be dust and metal chippings?

Tim Foo



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Re: Chamber Doors

[Patrick Lawler]

On Tue, 19 Feb 2002 18:08:09 +0800, Wan Juang Foo f...@np.edu.sg wrote:
snip
BTW, 'Be' (Beryllium) is a highly toxic metal that will not get out of your
blood once it enters it.  I would strongly advise anyone cleaning their
Be-Cu finger stocks from exposing themselves to any possibilities of cuts
or abrassions while cleaning these 'fingers'.
I understand the concentrations of Be is low but why would anyone take the
risk of prolonged exposure to Be dust and metal chippings?
snip
Are you sure?  Berylium Oxide (BeO) has a long-standing reputation for being
toxic, but I've never heard of metalic berylium (Be) posing a problem.

Patrick Lawler
plaw...@west.net

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Permanent Delivery Failure

[John Davies]

The attached message had PERMANENT fatal delivery errors!

After one or more unsuccessful delivery attempts the attached message has
been removed from the mail queue on this server.  The number and frequency
of delivery attempts are determined by local configuration parameters.

YOUR MESSAGE WAS NOT DELIVERED!

Failed address: john.dav...@polycom.com

--- Session Transcript ---
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 P=010 D=polycom.com TTL=(5) MX=[mail.polycom.com] {216.52.12.3}
 Attempting MX: P=010 D=polycom.com TTL=(5) MX=[mail.polycom.com] {216.52.12.3}
 Attempting SMTP connection to [216.52.12.3 : 25]
 Waiting for socket connection...
 Socket connection established
 Waiting for protocol initiation...
 220 corpit05.polycom.com ESMTP Server (Microsoft Exchange Internet Mail 
Service 5.5.2653.13) ready
 EHLO chatspace.com
 250-corpit05.polycom.com Hello [63.102.226.201]
 250-XEXCH50
 250-HELP
 250-ETRN
 250-DSN
 250-SIZE 0
 250-AUTH LOGIN
 250 AUTH=LOGIN
 MAIL 
From:gkznqhghaad1gacaafgpaqaa7oba3...@ieeepstc.mindcruiser.com 
SIZE=2976
 553 malformed address: 
gkznqhghaad1gacaafgpaqaa7oba3...@ieeepstc.mindcruiser.com 
SIZE=2976
 QUIT
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EN61000-6-2

[Sam Wismer]

Hi Group,
EN 61000-6-2 calls for severity level 3, or 10Vrms for conducted
disturbances.  This equates to 37dBm which is 7dB higher than the upper
limit my receiver will handle (during calibration of the CDN).  I've
tried to use an attenuator and compensate for it in my readings, but
this creates a high VSWR.  Any ideas how to extend the dynamic range of
my receiver without causing high VSWR?
 
 
Kind Regards,
 
 
Sam Wismer
Engineering Manager
ACS, Inc.
 
Phone:  (770) 831-8048
Fax:  (770) 831-8598
 
Web:  www.acstestlab.com
 

Re: New Generic ENs

[Kristiaan . Carpentier]

Richard,

EN 61000-6-1 has common deviations in clause 2, 3.5, Table 1 and Table 5.
EN 61000-6-3 has common deviations in clause 2, 4, 9, Table 1 and Annex A.
Both standards have an Annex ZA showing comparison between international
and EN/HD standards.
Hope this helps.
Regards,
Kris Carpentier





richwo...@tycoint.com on 19.02.2002 15:59:49

Please respond to richwo...@tycoint.com
  
  
  
 To:  emc-p...@majordomo.ieee.org 
  
 cc:  (bcc: Kristiaan CARPENTIER/BE/ALCATEL)  
  
  
  
 Subject: New Generic ENs 
  






Are EN 61000-6-1 and -3 identical to the IEC generic standards, or did
CENELEC introduce modifications?

Richard Woods
Sensormatic Electronics
Tyco International


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Re: Flammabilty requirement for cloth used on loudspeaker / UL6500

[Ed Eszlari]

I have heard the "lilly" tablets can be purchased at Target stores, although I have not yet verified this.
Ed

From: Rich Nute 
Reply-To: Rich Nute 
To: e.l...@wanadoo.fr 
CC: emc-p...@majordomo.ieee.org 
Subject: Re: Flammabilty requirement for cloth used on loudspeaker / UL6500 
Date: Wed, 13 Feb 2002 13:35:17 -0800 (PST) 
 
 
 
Hi Pierre: 
 
 
  Unfortunately, Hexamine is temporarely unavailable from IMSPLUS, and, 
  furthermore, this product cannot be sold outside the US. 
  
  If somebody knows another source, he's welcome ! 
 
I did a Google search and found at least one more source: 
 
 http://www.omahas.com/store/commerce.pl?product=Messkits 
 
I believe there are some Euro sources in the Google results, 
but I did not check all the listed sources. 
 
 
Good luck and best regards, 
Rich 
 
 
 
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RE: Bellcore Redundancy Requirements?

[Gary McInturff]

I'd be interested as well, for two reasons. 1) I think the requirement 
is a bit out of date, and really only discusses bringing in two DC power feeds, 
A and B. That however seems more adapted to the days of simpler systems that 
would take the power through some steering diodes and take it straight to a 
back plane and power all of the cards in the box. As things have become more 
complex systems inject system power supplies (DC-DC for example) into the 
network but the standards don't seem to address the need for redundancy at this 
point. Unfortunately, I don't have the document in my hands, it was a question 
that came up during some recent testing.
2) Isn't L-10 a fan type of specification. The point at which 10% of 
the fans fail. I have been chasing this question on and off for awhile.
Thanks
Gary


-Original Message-
From: kazimier_gawrzy...@dell.com [mailto:kazimier_gawrzy...@dell.com]
Sent: Saturday, February 16, 2002 7:25 AM
To: emc-p...@ieee.org
Subject: RE: Bellcore Redundancy Requirements?



Hello All,

If any members of this forum have any response copies that were sent out to
John's question below, would you please forward a copy to me?  

Thanks In Advance,
Kaz Gawrzyjal
kazimier_gawrzy...@dell.com

-Original Message-
From: Kretsch, John [mailto:john_kret...@adc.com]
Sent: Wednesday, February 14, 2001 12:37 PM
To: 'emc-p...@ieee.org'
Subject: Bellcore Redundancy Requirements?



Does anyone in the collective know about _where_ Bellcore spells out any
sort of redundancy requirements.
There is a buzz about L-10 requirements and I'm not sure where this comes
from.

TIA.

Regards,
John Kretsch

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RE: Resistors pulse loading capabilities

[Price, Ed]

-Original Message-
From: John Barnes [mailto:jrbar...@iglou.com]
Sent: Tuesday, February 19, 2002 4:45 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: Resistors pulse loading capabilities



Massimo,
All the tests that I've seen for evaluating the peak-pulse-power
handling capabilities of resistors are based on charging a bank of
capacitors to a high voltage, then applying this energy (E = 
1/2 * c * V
* V) to the part/equipment-under-test through a low-resistance
low-inductance switch or relay.  You need to be very careful running
these tests, because there is enough energy involved to kill you!  

For the Keytek surge generator that I used to run IBM Lightning Surge
Susceptibility tests on network adapter cards, this came to something
like 4 joules at 800 volts, with the tester rated to deliver up to 200
amps maximum.  That tester required you to toggle two widely-spaced
switches to trigger a discharge, to make sure that you had 
both hands on
the tester.  I always triple-checked my test setup, then had another
experienced engineer double-check me, before I even plugged in 
the surge
tester.  I blew up quite a few components, and fried a few circuit
boards, while developing/helping develop some 35 IBM and Lexmark
networking/digital-office products from 1990 through January 2002.
 
NOTE: You also want to put a direct short across the 
capacitors when the
tester is not in use.  Dielectric absorbtion stores some energy in the
dielectric of a capacitors as a physical displacement of the atoms. 
This can take seconds to hours to relax, and as it does it induces a
corresponding charge on the capacitors' plates.  Without a bleeder
resistor of some type across the capacitors, up to 10% or so of the
initial charging voltage can appear on the capacitors after they have
supposedly been discharged.  This could give you a nasty, if non-fatal
shock, next time you want to use the tester.

As for help choosing the resistors for your circuit, check out
The Resistor Handbook   by Cletus J. Kaiser (98 pages, 1994, CJ
Publishing, Olathe, Kansas, ISBN 0-9628525-1-1).  This is the best
single source I've found for information on resistors.  On 
page 3, under
the subheading   One Short Pulse   it says:
 The theory of pulse handling depends on the pulse width. 
 One 
  short pulse of 100 milliseconds or less is assumed to never
havetime enough to do more than heat the element.  Therefore
the  
  calculation is based on the total mass of the element (wire)
being   heated to the maximum internal hot-spot temperature.

As Bob Wilson said, this will depend on the overall type of resistor,
and on the specific details of its construction (i.e. manufacturer/
series).  You need to consider the bulk sections of the resistor, which
have relatively-uniform construction, and the interfaces between them.

So I would expect bulk-metal resistors, such as those made by 
Vishay, to
have the highest peak-power/rated-power capability because they are
essentially one piece of metal.  From there I would look at:
1.  Carbon-composition resistors.
2.  Wirewound resistors.
3.  Untrimmed metal-film resistors.
4.  Untrimmed carbon-film resistors.
5.  Untrimmed cermet resistors.
6.  Trimmed metal-film resistors.
7.  Trimmed carbon-film resistors.
8.  Trimmed cermet resistors.

The untrimmed film resistors have rather sloppy tolerances, on 
the order
of +/-20% or so, but have much higher pulse-power handling capability
than their trimmed brethren.  (We got bitten by this, when purchasing
had trouble getting the part we had specified for a Token-Ring 
card, and
substituted a part that the salesman said was even better 
than the one
we wanted.)  If you must use a trimmed resistor, because of tolerances,
abrasive trimming would probably be better than laser trimming, because
it makes a smoother cut and leaves less debris.  

I found it very educational to look at resistors under a microscope
(about 10-30x magnification sufficed), both before and after 
running the
Lightning Surge Susceptibility test.  The failed resistors looked like
they had been machine-gunned, with a vertical line of pits across the
surface of the resistor from the corner of the L (left by 
trimming) to
the edge of the resistor.

   John Barnes
   dBi Corporation

---

Let me add one more type of resistor, right at the top of your list. I have
used silicon carbide resistors (made by Carborundum, then Ceseiwid, now the
name has changed again) as pulse generator loads and source impedance
adjustors.

These resistors have the inductance of a similar sized piece of rod stock,
and can handle tremendous short duration currents. They can function
properly right up to the point of glowing. They withstand high voltages
pretty well (best to choose a rod shape rather than a thick washer or hockey
puck shape).

These resistors withstand power only 

New Generic ENs

[richwoods]

Are EN 61000-6-1 and -3 identical to the IEC generic standards, or did
CENELEC introduce modifications?

Richard Woods
Sensormatic Electronics
Tyco International


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Industrial Locations

[richwoods]

Do the Generic emission and immunity ENs for industrial locations provide
examples of those locations? If so, I would appreciate someone providing the
list of the example locations. I need to compare them against the examples
of light-industrial locations. Thanks in advance.


Richard Woods
Sensormatic Electronics
Tyco International


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Re: Resistors pulse loading capabilities

[John Barnes]

Massimo,
All the tests that I've seen for evaluating the peak-pulse-power
handling capabilities of resistors are based on charging a bank of
capacitors to a high voltage, then applying this energy (E = 1/2 * c * V
* V) to the part/equipment-under-test through a low-resistance
low-inductance switch or relay.  You need to be very careful running
these tests, because there is enough energy involved to kill you!  

For the Keytek surge generator that I used to run IBM Lightning Surge
Susceptibility tests on network adapter cards, this came to something
like 4 joules at 800 volts, with the tester rated to deliver up to 200
amps maximum.  That tester required you to toggle two widely-spaced
switches to trigger a discharge, to make sure that you had both hands on
the tester.  I always triple-checked my test setup, then had another
experienced engineer double-check me, before I even plugged in the surge
tester.  I blew up quite a few components, and fried a few circuit
boards, while developing/helping develop some 35 IBM and Lexmark
networking/digital-office products from 1990 through January 2002.
 
NOTE: You also want to put a direct short across the capacitors when the
tester is not in use.  Dielectric absorbtion stores some energy in the
dielectric of a capacitors as a physical displacement of the atoms. 
This can take seconds to hours to relax, and as it does it induces a
corresponding charge on the capacitors' plates.  Without a bleeder
resistor of some type across the capacitors, up to 10% or so of the
initial charging voltage can appear on the capacitors after they have
supposedly been discharged.  This could give you a nasty, if non-fatal
shock, next time you want to use the tester.

As for help choosing the resistors for your circuit, check out
The Resistor Handbook   by Cletus J. Kaiser (98 pages, 1994, CJ
Publishing, Olathe, Kansas, ISBN 0-9628525-1-1).  This is the best
single source I've found for information on resistors.  On page 3, under
the subheading   One Short Pulse   it says:
 The theory of pulse handling depends on the pulse width.  One 
  short pulse of 100 milliseconds or less is assumed to never
havetime enough to do more than heat the element.  Therefore
the  
  calculation is based on the total mass of the element (wire)
being   heated to the maximum internal hot-spot temperature.

As Bob Wilson said, this will depend on the overall type of resistor,
and on the specific details of its construction (i.e. manufacturer/
series).  You need to consider the bulk sections of the resistor, which
have relatively-uniform construction, and the interfaces between them.

So I would expect bulk-metal resistors, such as those made by Vishay, to
have the highest peak-power/rated-power capability because they are
essentially one piece of metal.  From there I would look at:
1.  Carbon-composition resistors.
2.  Wirewound resistors.
3.  Untrimmed metal-film resistors.
4.  Untrimmed carbon-film resistors.
5.  Untrimmed cermet resistors.
6.  Trimmed metal-film resistors.
7.  Trimmed carbon-film resistors.
8.  Trimmed cermet resistors.

The untrimmed film resistors have rather sloppy tolerances, on the order
of +/-20% or so, but have much higher pulse-power handling capability
than their trimmed brethren.  (We got bitten by this, when purchasing
had trouble getting the part we had specified for a Token-Ring card, and
substituted a part that the salesman said was even better than the one
we wanted.)  If you must use a trimmed resistor, because of tolerances,
abrasive trimming would probably be better than laser trimming, because
it makes a smoother cut and leaves less debris.  

I found it very educational to look at resistors under a microscope
(about 10-30x magnification sufficed), both before and after running the
Lightning Surge Susceptibility test.  The failed resistors looked like
they had been machine-gunned, with a vertical line of pits across the
surface of the resistor from the corner of the L (left by trimming) to
the edge of the resistor.

John Barnes
dBi Corporation

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Re: Chamber Doors

[Wan Juang Foo]

The other problem could be that whoever build the chamber did not make the
door.  They buy it off from someone else and the warranty is only one year.
:-)  One year seems to be reasonable period considering that there is a
number of things that can go wrong with moving parts that are constantly
held under pressure.

BTW, 'Be' (Beryllium) is a highly toxic metal that will not get out of your
blood once it enters it.  I would strongly advise anyone cleaning their
Be-Cu finger stocks from exposing themselves to any possibilities of cuts
or abrassions while cleaning these 'fingers'.
I understand the concentrations of Be is low but why would anyone take the
risk of prolonged exposure to Be dust and metal chippings?

Tim Foo


|-+-
| |   Cortland Richmond |
| |   72146.373@compuserve.|
| |   com  |
| |   Sent by:  |
| |   owner-emc-pstc@majordo|
| |   mo.ieee.org   |
| | |
| | |
| |   02/12/02 01:23 AM |
| |   Please respond to |
| |   Cortland Richmond |
| | |
|-+-
  
---|
  | 
  |
  |To:  djumbdenst...@tycoint.com djumbdenst...@tycoint.com, 
ieee pstc list emc-p...@ieee.org   |
  |cc:  (bcc: Wan Juang Foo/ece/staff/npnet)
  |
  |Subject: Re: Chamber Doors   
  |
  
---|





 Can you share with us what experiences you have had with doors of your
steel
clad chambers? If you could share such things as chamber vendor, hinge
adjustments, door maintenance recommended and performed, warranty claims
and
length of time without problems, that would help us understand the 1 year
policy.  Anyone have any interesting stories? 

Don,

From the numbers you gave, I'd say the reason is, the doors are five times
more likely to fail than the chambers. This is reasonable - they are the
only things that move. And I'd say that the causes of failure are more
related to installation practice and maintenance, than to design, so a
one-year warranty will cover problems due to (say) being slightly mishung.
Though workmanship should have its own warranty, if their team installs it.

After a year, door failures are likely almost ALL due to maintenance or its
lack, than to materials and installation. I've rarely seen folks doing
monthly maintenance on the fingers that seal a door.

That's MY two cents.

Cortland






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GSM EMC Test Specification

[Jong Ho,Lee]

Hi Folk

I want to know EMC standards and Test specifications of GSM as follow.

■ GSM phone

■ GSM accessory (i.e. Adaptor,Ear phone)

If you kow about that,Please let me know.

Best regards

James.

RE: IEC 61000-6-3

[richwoods]

Thanks to David Spencer who pointed out that the document can be located
using the CISPR rather than IEC prefix. 

  -Original Message-
 From: WOODS, RICHARD  
 Sent: Monday, February 18, 2002 12:46 PM
 To:   'emc-pstc'
 Subject:  IEC 61000-6-3
 
 I can't find IEC 61000-6-3 on the IEC web site, but it was published many
 years ago. Could it be under a different numbering scheme? What's
 interesting is that IEC 61000-6-1 is there as are other parts of the -6
 series.
 
 
 Richard Woods
 Sensormatic Electronics
 Tyco International
 

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RE: Resistors pulse loading capabilities

[Robert Wilson]

I suspect that this will depend very strongly on the characteristics of
specific type of resistor. Further, there will undoubtedly be very
significant differences from manufacturer to manufacturer, in the
ability to absorb stresses well beyond normal design intent. I think it
would be rather hard (or even perhaps impossible) to make
generalizations that would apply to, for example, all 1 Watt resistors.

Bob Wilson
TIR Systems Ltd.
Vancouver.

-Original Message-
From: Massimo Polignano [mailto:massimo.polign...@esaote.com] 
Sent: February 18, 2002 6:03 AM
To: emc-p...@majordomo.ieee.org
Subject: Resistors pulse loading capabilities



Does anybody out of there know what are the methods to evaluate
resistors pulse loading capabilities (maximum peak pulse voltage without
failing to open circuit)? Is there any standard models? This could be
very useful to design the power supply circuit parts involved in a surge
immunity test.

Thanks in advance.
m.p.

-
ESAOTE S.p.A. Massimo Polignano
Research  Product DevelopmentDesign Quality Control Mngr
Via di Caciolle,15tel:+39.055.4229402
I- 50127 Florence fax:+39.055.4223305
e-mail: massimo.polign...@esaote.com



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IEC 61000-6-3

[richwoods]

I can't find IEC 61000-6-3 on the IEC web site, but it was published many
years ago. Could it be under a different numbering scheme? What's
interesting is that IEC 61000-6-1 is there as are other parts of the -6
series.


Richard Woods
Sensormatic Electronics
Tyco International


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RE: Resistors pulse loading capabilities

[Chris Chileshe]

Hi Massimo,

Try http://www.vtm.co.uk/.

They had a good calculation method in the printed version of their
catalog which does not seem to be available on the website ( I haven't
looked very hard for it). It worked well for sizing in-rush limiting resistors.

Regards

- Chris



-Original Message-
From:   Massimo Polignano [SMTP:massimo.polign...@esaote.com]
Sent:   Monday, February 18, 2002 2:03 PM
To: emc-p...@majordomo.ieee.org
Subject:Resistors pulse loading capabilities


Does anybody out of there know what are the methods to evaluate resistors
pulse loading capabilities (maximum peak pulse voltage without failing to
open circuit)?
Is there any standard models?
This could be very useful to design the power supply circuit parts involved
in a surge immunity test.

Thanks in advance.
m.p.

-
ESAOTE S.p.A. Massimo Polignano
Research  Product DevelopmentDesign Quality Control Mngr
Via di Caciolle,15tel:+39.055.4229402
I- 50127 Florence fax:+39.055.4223305
e-mail: massimo.polign...@esaote.com



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Re: Resistors pulse loading capabilities

[John Woodgate]

I read in !emc-pstc that Massimo Polignano
massimo.polign...@esaote.com wrote (in OF78266151.726D3F50-ONC1256B64
.004c7...@esaote.com) about 'Resistors pulse loading capabilities', on
Mon, 18 Feb 2002:
Does anybody out of there know what are the methods to evaluate resistors
pulse loading capabilities (maximum peak pulse voltage without failing to
open circuit)?
Is there any standard models?
This could be very useful to design the power supply circuit parts involved
in a surge immunity test.

Try IEC60115 (a multi-part standard) and IEC/TR60440. Brief details are
available at http://www.iec.ch

The specification sheets for metal glaze resistors, such as Philips VR25
and VR37, may be informative.
-- 
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk 
After swimming across the Hellespont, I felt like a Hero.
PLEASE do NOT copy news posts to me by E-MAIL!

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Resistors pulse loading capabilities

[Massimo Polignano]

Does anybody out of there know what are the methods to evaluate resistors
pulse loading capabilities (maximum peak pulse voltage without failing to
open circuit)?
Is there any standard models?
This could be very useful to design the power supply circuit parts involved
in a surge immunity test.

Thanks in advance.
m.p.

-
ESAOTE S.p.A. Massimo Polignano
Research  Product DevelopmentDesign Quality Control Mngr
Via di Caciolle,15tel:+39.055.4229402
I- 50127 Florence fax:+39.055.4223305
e-mail: massimo.polign...@esaote.com



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Wood Packaging Treatment

[richwoods]

The following information is being forwarded since someone recently asked
about the subject. The information is extracted with permission from
Recycling Policy NewsBriefs Email Bulletin for Raymond Communications, Inc.
College Park MD, publishers of State Recycling Laws Update and Recycling
Laws International. All material copyright 2001, Raymond Communications.
http://www.raymond.com

February 16, 2002

Wood Packaging to Face Major Restrictions

New international laws and standards will have a major impact on how
end-users deal with their solid wood packaging. 

The European Union, Finland, Brazil, China and other countries already
restrict un-treated coniferous wood packaging.  Thus, end-users need to
purchase packaging that is heat-treated and stamped.

But draft international standards for wood packaging go much farther -
requiring either fumigation or heat treatment of any raw wood packaging -
including hardwoods (e.g. pallets) and dunnage.

The draft standard, from the Secretariat of the International Plant
Protection Convention, Food and Agriculture Organization of the United
Nations has drafted new guidelines designed to keep foreign pests from
eating away at forests. Besides treatment, the draft standards require
complete de-barking - a requirement that may be impossible to enforce,
according to experts at the U.S.Department of Agriculture.

The standard allows a wide variety of treatments, including heat treatment
or methyl bromide fumigation. The packaging, which includes wooden dunnage,
must be marked with the symbol, plus the method of treatment, country of
origin, and number of the original producer of the packaging.

Exporters must purchase a finished package with the proper stamping if it
gets exported.  If you produce or modify the wood package (e.g. repair the
pallet) USDA says you will have to get it treated and inspected to certify
wood packaging leaving the country.


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