Chris,
Using a PCB layer as an RF shield. Don't forget you probably have that PCB
layer cut into swiss cheese with vias, unless you used blind vias.
Background:
A microstrip trace will radiate off the board a certain amount - makes sense
since part of its
On Thu, 21 Feb 2002 11:28:57 -0800, you wrote:
My apologies! In the last message I put a wrong address: maHordomo.. and
of course the message got rejected - there just ain't no AI in my address
book!
snip
You should be glad your address book has no AI.
Our company email program is Lotus
Are you looking for a laboratory to perform the testing, or a copy of the
standard so you can review the requirements?
In the United States, standards for food products are controlled by the FDA
(Food and Drug Administration).
I found one web page you might start with:
All,
Adtran has a T200/T400 shelf platform that several companies apparently make
circuit packs for.
My contact at Adtran has said that it is an old industry standard pin out
configuration for circuit packs, is similar to the old STD computer bus, and
thinks it was originally developed by
Hi Listmembers:
Would anyone be able to help me get a copy of the schematic for a plug-in RF
amplifier board for an HP-8662 RF Synthesized Signal Generator? The board is
designated the A4A1 Output Amplifier, there is an internal sticker that
reads HP-08662-67008, and there is a section of
My apologies! In the last message I put a wrong address: maHordomo.. and
of course the message got rejected - there just ain't no AI in my address
book!
Gabi:
You will have read some more on the subject, so best of good luck to you!
Bogdan.
bogdan matoga wrote:
Gabi:
I believe that there
Here is more information on the new scheme.
http://www.esimcom.com/aak2_0_1_2/simcom_about/cccmark.asp
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I read in !emc-pstc that richwo...@tycoint.com wrote (in 846BF526A205F8
4BA2B6045BBF7E9A6A01F13E61@flbocexu05) about 'EN 61000-3-3 A1', on Thu,
21 Feb 2002:
Is there anyone that disagrees that limited inrush current is not a
requirement under the amended standard?
I think I should not fail to
The inability of Schuko plugs to be able to be polarized, may have
something to do with the fact that German homes (at least) are supplied
with 3-phase power. Some time ago this came as a surprise when a friend
was showing me his new lathe he had just installed in his basement,
which used a
Dear All,
Can anyone help identify a laboratory testing to Sanitary Standards for
Level Sensing Devices for Dry Milk and Dry Milk Products,
Number 50-00?
This e-mail message may contain privileged or confidential information. If
you are not the intended recipient, you may not disclose, use,
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Sorry, te syntax of my question was incorrect. Let me try again.
Is there anyone that disagrees with the following statement? Inrush current
is a requirement under the amended standard.
-Original Message-
From: WOODS, RICHARD
Sent: Thursday, February 21, 2002 9:55 AM
Chris,
I had a thought, reading your message, that even a plain metal sheet, if it
is close to a half wavelength across, has an RF hot spot in the middle. In
that case, you must keep one side of the sheet (plane) cold, while the
other is not. This means good grounds (UHF RF returns) at the
There has been controversey over the intrepretation of EN61000-3-3 as to the
need to consider in-rush current. HP had concluded that it was not a
measurement requirement and had not included the measurement in their
software. However, my reading of the new A1 indicates that measurement of
Gabi,
Check out
[912] Linholm, Loren W., and Plachy, Richard F., Electrostatic
Gate Protection Using an Arc Gap Device, 11th Annual Proceedings
Reliability Physics. Las Vegas, NV, Apr. 3-5, 1973, pp. 198-202.
[1387] Wallash, Albert J. and Hughbanks, Timothy H.,
Hi - I'm looking for some practical advise on using an inner Printed Circuit
Board PCB plane tied at the corner mounting holes of the chassis as a shield
from RF exposure coming in on an isolated field circuit relative to another
digital logic board.
Questions:
a.. Must my shield layer be
Dear all,
In UL6500, table 14, it's stated the flammability category could be 5VA for
some materials.
Can somebody remember me this classification using 5VA, 5VB, ... ? and what
are the equivalence (if any) with the classification defined by UL94 ?
I know the classification HB, V2, V1, V0, 5V,
I read in !emc-pstc that Allen, John john.al...@uk.thalesgroup.com
wrote (in 999c839e7e27d41185ec00d0b7473692024cd...@norway.int.rdel.co.u
k) about 'South Korean Power System Schuko Plugs', on Thu, 21 Feb
2002:
Double-pole fusing requirements may depend on the product standard
requirements, but
Hi Folks
A few years ago I worked for BSI Technical Help to Exporters and helped to
update their publication World Wide Plugs and Sockets Survey - which I
assume is still available from BSI (see www.bsi-global.com)
I remember looking at the Korean standards for plugs and sockets:- Yes -
they
List-Post: emc-pstc@listserv.ieee.org
Date: 20-Feb-02 13:38:27 MsgID: OUTBOX
MgTo: Gabi Hoffknecht INTERNET:gab...@simex.ca
Subj: Re: Using PCB traces as transient voltage suppressor
Hi, Gabi,
I have a bad feeling about spark gaps on a board. There may be conductive
material left on the
When do you need a fuse? Level II is the only time you are allowed to lose
functionality, and the requirement for THAT is, it can't catch fire or
explode. I've seen trace fuses tried. The problem comes after the trace
blows. You are at the mercy of your board shop, and if you use a number of
The nature of a CDN is that its purpose is to provide a 150 Ohm source
impedance for the injected rf. The requirement is specified as an open
circuit potential and a 150 Ohm source impedance. Since rf signal sources
and amplifiers for our line of work have 50 Ohm source impedance, the CDN
Our experience with gas discharge tubes was that they worked according to
spec in the lab. fired perfectly around 400V like they're supposed to, but
down inside of the PVC oil tank holding the 150KV isolation transformer they
liked to fire at 600V+
Guess they needed photon energy to make the
Rich and Scott -
Irrespective of how any test house decides to address
indicator LEDs, my discussions with TC76 members and
contributing experts, including Bob Weiner and Jerome
Dennis, as well as the remainder of the members at a panel
discussion at the 1997 Laser Institute of America
I read in !emc-pstc that Chris Maxwell chris.maxw...@nettest.com wrote
(in 83d652574e7af740873674f9fc12dbaaf7d...@utexh1w2.gnnettest.com)
about 'Use of PCB Traces as Fuse and Voltage suppressor', on Wed, 20 Feb
2002:
I'm sorry if you thought that my previous message was an endorsement for
using
I read in !emc-pstc that Gabi Hoffknecht gab...@simex.ca wrote (in
80847F2BCE8AD511BE2F0060976AD68A03ECC8@SIMEXPDC01) about 'Using PCB
traces as transient voltage suppressor', on Wed, 20 Feb 2002:
I have seen PCB designs with two triangular shaped copper pads pointed
towards each other at very
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200202202227.oaa19...@epgc264.sdd.hp.com) about 'double-pole switching
and fusing', on Wed, 20 Feb 2002:
Tables 2E and 2F are invoked only by the Note 2
to Sub-clause 2.7.4.
A Note is informative, not a requirement.
Yes, well, Note 2
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