present format for decades and is unlikely to
change any time soon.
Regards,
Peter L. Tarver, PE
ptar...@ieee.org
From: Mike Hopkins
Sent: Tuesday, November 18, 2003 12:42 PM
Info from outside the EU:
In the US, ANSI and others
have been told that any new standards written
must be harmonized
I think the length of a 1/2 wave dipole in feet is basically 468/f(MHz)
where the ratio of the length to diameter is very large (wire antennas in
the HF region, for example). Making the diameter of the elements larger does
two things: it reduces the overall length of the antenna and increases the
Not aware of any standards for ESD related to development; however, since new
products will likely need to meet existing international and national
standards, that would be the place to start
In my experiance, engineering labs tend to use the standards (IEC 61000-4-2
being the most
...@msn.com]
Sent: Friday, September 19, 2003 7:13 PM
To: Mike Hopkins; Konrad Stefanski; emc-p...@ieee.org
Subject: Re: SURGE testing, disturb. meas.
So is an ethernet line considered disabled when disconnected since it will
drop the link (although it keeps trying to establish link and resume the idle
There are couplers available from a number of manufacturers; however, none
work at data rates much above 100kHz. For that reason, the current draft of
61000-4-5 revision 2 (not yet circulated) inlcudes the following -- keep in
mind, it is an EARLY draft, but it will appear in a CD by the end of
Prices depend on the design:
Some contain coupling and backfilter elements for 4 lines plus circuitry to
allow coupling using either capacitors (still the preferred method in
61000-4-5) or arrestors. They also allow the addition of clamps of various
levels to reduce or eliminate surges back to
michael.hopk...@thermo.com
One Thermo, committed to integrity, intensity, innovation involvement
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Friday, August 29, 2003 2:49 PM
To: emc-p...@majordomo.ieee.org
Subject: Re: antennas
I read in !emc-pstc that Mike Hopkins michael.hopk
For lightning in the power grid, see
ANSI/IEEE C62.41.1 - 2002 Guide on the Surge Environment in Low-Voltage (1000V
and Less) AC Power Circuits
ANSI/IEEE C62.41.2 - 2002 Recommended Practice on Characterization of Surges
in Low-Voltage (1000V and Less) AC Power Circuits
ANSI/IEEE C62.45
There is a new document in the works, IEC 61000-4-34, for dip interrupt
testing of products drawing greater than 16A. It is currently a CD
(Committee Draft). TC77A WG6, who is responsible for this document, meets in
Spain in September, after which a CDV (Committee Draft for Vote) is
possible. It
All I know is that it seems to be a major problem in Europe, with lot's of
HF spectrum uses seeing high levels of interference to services. Amateur
Radio organizations world-wide are fighting it (including ARRL in the US).
I heard a talk regarding this problem in Germany at the last IEEE EMC
...@nettest.com]
Sent: Tuesday, June 24, 2003 11:16 AM
To: Mike Hopkins; don_borow...@selinc.com; emc-p...@majordomo.ieee.org
Subject: RE: ESD - not applicable ?
Mike,
I'm still not sold.
I understand the specific exemptions for circuit cards, battery compartments
and the like; but I can't follow
You always need to apply two heads --- the engineering head says,Good
engineering practice says you should test for ESD, but the compliance head
only needs to meet the requirement of the standard, which clearly exempts
points and ports NOT accessible by an OPERATOR.
Points and ports accessible
Lowell, MA 01852
Tel: +1 978 275 0800 ext. 334
Fax: +1 978 275 0850
michael.hopk...@thermo.com
One Thermo, committed to integrity, intensity, innovation involvement
From: Locke, Darrell [mailto:dlo...@advanced-input.com]
Sent: Monday, June 09, 2003 4:37 PM
To: Mike Hopkins
Cc: EMC-PSTC List
Actually, the EFT test pre-dates the IEEE reference. IEEE included a
reference to IEC 801-4 in the earlier IEEE 587 document, which has now
become ANSI/IEEE C62.41 (now reissued as a 2002 document as a Trilogy:
C62.41, C62.42, and C62.45). In the 70's, EFT tests were being conducted in
Europe
So is mine (hand up, that is)
Best Regards,
Michael Hopkins
Manager, EMC Technologies
Thermo Electron
Control Technology Division
EMC ESD Simulation Systems
One Lowell Research Center
Lowell, MA 01852
Tel: +1 978 275 0800 ext. 334
Fax: +1 978 275 0850
michael.hopk...@thermo.com
One
The first one to come to mind is ANSI C63.16 for ESD -- finished a document
recently for ESD testing of products -- should be published soon
Also, there is the IEEE SPD -- Surge Protective Devices -- group under the
Power engineering society that just published ANSI/IEEE C62.41.1, C62.41.2
Since you can buy a compliant gun for a few thousand dollars (used, demos,
etc), why would you want to spend at least that much in time and
materials to get something close??
Mike Hopkins
Thermo Electron
michael.hopk...@thermo.com
From: LEUNG YAT WAH DEREK [mailto:ywle...@vtc.edu.hk]
Sent
Because you're dealing with a relatively high frequency event, you really do
need a good target and measurement system to verify that the waveform is in
compliance
That said, there are a number of ways to verify that the gun is working and
is probably okay without going to any extremes.
One
The surge generator specification is 2 ohms source impedance for testing in
normal mode (line to line) and 12 ohms for testing in common mode (surges
line to ground).
Mike Hopkins
Thermo Electron
KeyTek
From: drcuthbert [mailto:drcuthb...@micron.com]
Sent: Wednesday, March 19, 2003 3:36 PM
be very close to other sources or radiation from, say, 5W
walkies used by security personnel -- how much of a field can you get a
150MHz a foot from a 5W transmitter??
Mike Hopkins
Thermo KeyTek
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Monday, March 03, 2003 12:41 PM
To: emc-p
I believe the other bands are television broadcast
M. Hopkins
Thermo KeyTek
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Monday, March 03, 2003 11:03 AM
To: Gordon,Ian; 'IEEE EMC-PSTC GROUP'
Subject: Re: RADIATED IMMUNITY REQUIREMENTS FOR EN61326
Hazarding a guess. I am
. Don't know enough about your product to comment of the
practicality fo such a test.
Hope it's helpful...
Mike Hopkins
Thermo KeyTek
-Original Message-
From: am...@westin-emission.no [mailto:am...@westin-emission.no]
Sent: Thursday, October 31, 2002 10:48 AM
To: emc-p
like voltage (testing to as high as 6kV for surge), how the dip interrupt
tests are done (external variac's and switches vs. internal tap switched
transformers), software control, etc...
I'll leave the CISPR 11 questions to someone more qualified than I am.
Mike Hopkins
-Original Message
generators designed to
meet only the CCITT or IEC specification may not also meet the 9/720us
requirements of FCC. Both specify a 20uF energy storage capacitor for this
waveform...
Hope this helps...
Mike Hopkins
Thermo KeyTek
-Original Message-
From: John Cronin [mailto:croni
Agreed -- I've received this virus about 50 times in the last few days, but
each time the system (local server) quarantines it..
Mike Hopkins
Thermo KeyTek
-Original Message-
From: Robert Wilson [mailto:robert_wil...@tirsys.com]
Sent: Wednesday, April 24, 2002 11:47 AM
To: emc-p
make a coupler that incorporates both methods
described above -- 20mH chokes and 0.5uF capacitor -- good to about 3kHz,
plus the arrestor coupling with resistors -- good to about 100kHz.
Best Regards,
Mike Hopkins
-Original Message-
From: david_ster...@ademco.com [mailto:david_ster
,
Mike Hopkins
Thermo KeyTek.
-Original Message-
From: Robert Macy [mailto:m...@california.com]
Sent: Wednesday, February 20, 2002 7:18 PM
To: Chris Maxwell; bogda...@pacbell.net
Cc: EMC-PSTC Internet Forum
Subject: Re: Use of PCB Traces as Fuse and Voltage suppressor
Our experience
for another day.)
Mike Hopkins
-Original Message-
From: Jacob Schanker [mailto:schan...@frontiernet.net]
Sent: Wednesday, February 20, 2002 4:01 PM
To: Mike Hopkins; 'Colgan, Chris'; EMC Forum
Subject: Re: EN61000-6-2
Mike:
My experience tells me that an attenuator designed for the same
Seems an attenuator COULD improve matching and VSWR if it then became a
significant part of the load impedance; it isn't a given. On the other
hand, adding the attenuator should NOT cause the VSWR to become very high
unless it is not a 50 ohm attenuator..
Mike Hopkins
-Original
in airports
world-wide.
From a vantage point several thousand feet above the local power lines, a
25ms burst once/hour would be no big deal, but if there are lots of 25ms
bursts/hour in a given area, this could be a problem!
Mike Hopkins
Thermo KeyTek
(pilot of small airplane who does not want the ADF
Oops. Meant to say the 801 series is obsolete and replaced by the
IEC 61000-4-X series, which is true..
Mike H.
-Original Message-
From: Mike Hopkins [mailto:mhopk...@thermokeytek.com]
Sent: Friday, January 11, 2002 1:42 PM
To: 'Sam Wismer'; EMC Forum
Subject: RE
other opinions!) Good Luck.
Mike Hopkins
Thermo KeyTek
-Original Message-
From: Sam Wismer [mailto:swis...@bellsouth.net]
Sent: Friday, January 11, 2002 10:06 AM
To: EMC Forum
Subject: EN50091-2:1995
Hi all,
I am reviewing EN50091-2:1995 to determine the immunity requirements
worked well.
5. Just what are the symptoms -- no noise, white noise and no signal, loud
popping noise, .
Good luck,
Mike Hopkins
Thermo KeyTek
-Original Message-
From: Cortland Richmond [mailto:cortland.richm...@alcatel.com]
Sent: Thursday, January 03, 2002 6:32 PM
To: Charles
.) There
was also a video being circulated of a Connie Chung news broadcast relating
similar horror stories of the effects of EMC. We used to have a copy here,
but I haven't seen it in years -- probably dumped when we moved.
My 2 cents worth..
Mike Hopkins
Thermo KeyTek
-Original
Most Surge testers having ac mains couplers will also work with DC power
(some require minor options to work), so actually doing the test is pretty
easy Question as I read it was if it is in fact reasonable
Mike Hopkins
Thermo KeyTek
-Original Message-
From: KC CHAN [PDD
system bring DC into homes and buildings from
wires strung on telephone poles) and for these systems, lightning testing
might make sense -- hence no provision in the standard that makes DC systems
exempt from testing.
Hope this is helpful...
Mike Hopkins
Thermo KeyTek
-Original Message
harmonic is
fundamental plus the fundamental (once); second is the fundamental plus the
fundamental x 2, etc. ). I like it!
Mike Hopkins
Thermo KeyTek
-Original Message-
From: bogdan matoga [mailto:bogda...@pacbell.net]
Sent: Sunday, December 16, 2001 8:03 PM
To: Cortland Richmond
Cc
-- they were one of the few AC sources that weren't upset with
transients on the output stage coming back from an EUT.
Mike Hopkins
-Original Message-
From: Ehler, Kyle [mailto:keh...@lsil.com]
Sent: Tuesday, November 20, 2001 3:57 PM
To: 'Mike Hopkins'; Ehler, Kyle; 'wmf...@aol.com
in the AC levels you require via a variac or
some other transformer and simply switch between them
Mike Hopkins
-Original Message-
From: Ehler, Kyle [mailto:keh...@lsil.com]
Sent: Tuesday, November 20, 2001 1:19 PM
To: 'wmf...@aol.com'; emc-p...@ieee.org
Subject: RE: Methods Equipment
length acts as an impedance transformer.)
For specific frequencies, one could use the cable as an impedance matching
section between the source and load, but this is clearly unusable for
broad-band applications.
Mike Hopkins
-Original Message-
From: Ken Javor [mailto:ken.ja
are industry -- Siemens, Philips, Nokia,
IBM, Sun, HP, Schneider, Tele Danmark, Allen Bradley, Tokin, etc... Some of
these experts run labs within their companies, but they are not NRTL's or
Competent Bodies.
This composition is similar in the other WG's I'm familiar with, as well as
the US TAG's...
Mike
, the tests are performed between
lines, or line to ground, in which case the impedances will be higher -- up
to several hundred ohms
Hope that helps...
Mike Hopkins
Thermo KeyTek
-Original Message-
From: Yow, Steve (IndSys, GEFanuc, NA) [mailto:steve@gefanuc.com]
Sent: Wednesday
measured
significant potentials between separate grounds in the same building..
Mike Hopkins
KeyTek
-Original Message-
From: Chris Maxwell [mailto:chris.maxw...@nettest.com]
Sent: Tuesday, June 19, 2001 8:46 AM
To: 'Chris Chileshe'; emc-p...@majordomo.ieee.org
Subject: RE: ISO TR 10605
How about By The Way
Mike Hopkins
KeyTek
-Original Message-
From: rehel...@mmm.com [mailto:rehel...@mmm.com]
Sent: Wednesday, June 13, 2001 12:18 PM
To: emc-p...@majordomo.ieee.org
Subject: Typing Shortcuts
Over time I have come across many typing shortcuts using
Another point is that at lower voltages, the real rise times (the dv/dt) can
be quite a bit higher --- especially below about 5kV
Mike Hopkins
KeyTek
-Original Message-
From: Cortland Richmond [mailto:72146@compuserve.com]
Sent: Wednesday, April 25, 2001 2:33 AM
To: jrbar
That might be right, but if the FCC didn't ban the use of cell phones in
airplanes, I'd bet the airlines or FAA would.
Mike Hopkins
-Original Message-
From: rbus...@es.com [mailto:rbus...@es.com]
Sent: Thursday, January 25, 2001 12:26 PM
To: emc-p...@majordomo.ieee.org
Subject: RE
controls might
cause the airplane to do something erratic, but that sort of thing should be
recoverable as long as someone in the cockpit is paying attention.
Enough of that -- need to get back to my real job
Mike Hopkins
KeyTek
-Original Message-
From: Colgan, Chris
Blvd.
Torrance, CA 90505
Tel: 310 891 0635
Fax: 310 891 0644
Hope this helps,
Mike Hopkins
KeyTek
-Original Message-
From: wo...@sensormatic.com [mailto:wo...@sensormatic.com]
Sent: Tuesday, January 16, 2001 11:42 AM
To: emc-p...@majordomo.ieee.org
Subject: EN 61000-4-8
We
You read the table correctly, and it seems to be confusing a lot of people.
To go through it logically (I think)
The longer the line, the more likely surge energy would be coupled into a
cable -- certainly the case for induced lightning transients.
Terminated lines shorter than a few meters are
I've had a request to meet CEPT T/TR 02-02E, but can find no references to
this. I found the CEPT web site, but they don't mention any standards at
all. Can only find references to radio conferences, postage stamps and
amateur radio -- nothing specific to testing products.
Anyone out there have
is that shorter cables won't pick-up any
significant energy from a radiated surge event.
Hope this helps,
Mike Hopkins
-Original Message-
From: Zohar Zosmanovich [mailto:zohar_zosmanov...@radwin.com]
Sent: Wednesday, December 20, 2000 6:47 AM
To: 'emc-p...@majordomo.ieee.org'
Subject
Hi Sandy -- KeyTek built many of the crossed vane testers used by IBM and
their suppliers. Older units (pre 1980's) were built by another company --
don't remember who.
The crossed vane tester produces a ringing waveform which more closely
resembles the kind of waves you would see from a
Theoretically
Already we have EN's that are NOT identical with the IEC standards
What's the odds of the EU (CENELEC) coordinating closely with IEC on these
issues?? I'd say close to zero -- as convenor of IEC SC77B WG11 responsible
for such things as Surge and EFT
Virtually all commercially available EFT simulators with built-in
coupler/decouplers for the ac mains contain the 33nF capacitors internally.
The only reason you might need to use them externally is if you were
building your own coupler/decoupler, which also includes the necessary
backfilter
An excellent explanation -- I've seen these issues explained many times,
either over simplified or overly detailed. The explanation below is a superb
balance. Thanks
Michael Hopkins
KeyTek
-Original Message-
From: Nick Rouse [mailto:100626.3...@compuserve.com]
Sent: Thursday,
yet..
Best Regards,
Mike Hopkins
-Original Message-
From: Leslie Bai [mailto:leslie_...@yahoo.com]
Sent: Thursday, September 14, 2000 4:24 PM
To: IEEE EMC-PSTC (E-mail)
Subject: Immunity measurement uncertainty
Hello, members,
Is there anyone who can direct me to somewhere I can
Also, refer to IEC 61000-4-5 section on telecom and FCC Part 68 for surge
testing modems.
Mike Hopkins
KeyTek
-Original Message-
From: j...@aol.com [mailto:j...@aol.com]
Sent: Monday, September 11, 2000 11:19 AM
To: matt.aschenb...@echostar.com; emc-p...@majordomo.ieee.org
Subject: Re
You can also get coupler/decouplers that meet the spec from KeyTek
(1-800-753-9835) and other manufacturers.
Mike Hopkins
KeyTek
-Original Message-
From: Dan Kinney (A) [mailto:dan.kin...@heapg.com]
Sent: Friday, September 08, 2000 1:37 PM
To: David Gelfand; emc-p...@majordomo.ieee.org
An MOV won't work - it's a clamping device as opposed to a crowbar device.
Gas filled arrestors are common in the telecom industry -- try CP Clare,
Reltech (near Chicago), TII New York, Sankosha, Shinko, --- probably others,
but can't remember them.
Good luck
Mike Hopkins
KeyTek
which are characterized by being supplied directly at low voltage
from the public mains network are considered to be residential, commercial
or light industrial.
How's that??
Mike Hopkins,
KeyTek
-Original Message-
From: don_macart...@selinc.com [mailto:don_macart...@selinc.com]
Sent
My favorite is the light bulb and socket - simply changing a light bulb is
inherently unsafe..
Mike Hopkins
-Original Message-
From: Peter Tarver [mailto:ptar...@nortelnetworks.com]
Sent: Thursday, July 27, 2000 12:08 PM
To: emc-p...@majordomo.ieee.org
Subject: RE: Electrical safety
You are correct for purposes of COMPLIANCE to EN55024 and application of
a CE Mark, you test each line with respect to a reference ground (PE), but
as I'm sure you're aware, a customer can ask for whatever they think is
relevant.
Mike Hopkins
mhopk...@keytek.com
-Original Message
Not sure I understand what a zener barrier is, but if you mean there are
zener diodes across the line or even in series with the line, this has no
bearing on the applicability of 61000-4-5.
IEC 61000-4-5 is a method of surge testing a product without regard to the
signal line type, data,
EUT will behave with the surge, will it be
possible to determine how they will behave in parallel..
Good luck...
If you have any other questions, please give me a call or email -- Mike
Hopkins mhopk...@keytek.com or 1-800-753-9835.
Mike Hopkins
-Original Message-
From: Dale Albright
electronic
products.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: Barry Ma [SMTP:barry...@altavista.com]
Sent: Tuesday, March 28, 2000 12:40 PM
To: chr...@gnlp.com
Cc: bkundew...@qtm.net; nprov...@foxboro.com; emc-p...@ieee.org
Subject: RE: EN61326-1 Harmonics
of handling both the voltage (1500V) plus the
100A surge currents.
Let me know if you need help there.
Mike Hopkins
KeyTek
-Original Message-
From: David Spencer [SMTP:dspen...@oresis.com]
Sent: Thursday, March 23, 2000 11:16 AM
To: 'n...@world.std.com'; 'EMC PSTC'
Subject
Thought this was over by now;;; but since it continues, my vote is NO
split.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: Mark Hassebrock [SMTP:mhass...@qualcomm.com]
Sent: Friday, March 17, 2000 3:46 PM
To: emc-p...@majordomo.ieee.org
Subject: Split
connections. For example, many television sets have two wire power
plugs, are in plastic cases, but if you have cable tv, the odds are that
coax cable is grounded. Same thing applies if there is a telecom line
involved -- very likely one of the telecom lines is ground. ..
Mike Hopkins
You can't really use an AC power source for this requirement. The way its
done is with a tap switched transformer (KeyTek) or via a switch between two
or more variacs or other fixed ac sources.
Mike Hopkins
KeyTek
-Original Message-
From: fwhitfi...@rheintech.com [SMTP:fwhitfi
of the designated discharge points is the minimum.
Mike Hopkins
-Original Message-
From: kim.boll.jen...@lasat.com [SMTP:kim.boll.jen...@lasat.com]
Sent: Monday, January 17, 2000 5:41 AM
To: emc-p...@ieee.org
Subject: EN 61000-4-2
Dear all
I'm writing on a internal
Keep in mind rise time (really - turn on time) doesn't mean much on the AC
mains. Most specs assume the measurement is made right at the body of the
device, so even short wires will add enough inductance for a fast wave to
make the arguement moot.
-Original Message-
From: Dan Kwok
and if you go over the number even slightly, they'll blow.
Avalanche devices in series with a resistor or clamp are sometimes used, but
not as effective as a simple MOV.
Mike Hopkins
KeyTek
-Original Message-
From: Robert Macy [SMTP:m...@california.com]
Sent: Tuesday, January 11, 2000 7:26
than gain..
Mike Hopkins
-Original Message-
From: Lacey,Scott [SMTP:sla...@foxboro.com]
Sent: Tuesday, January 11, 2000 8:33 AM
To: 'emc-p...@ieee.org'
Cc: 'sla...@foxboro.com'
Subject: Tiger Tail for 27 MHz?
Fellow Listmembers,
I have a question regarding tiger
this is useful.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: David Monreal [SMTP:dmonr...@advancedshielding.com]
Sent: Tuesday, January 11, 2000 5:15 AM
To: emc-p...@majordomo.ieee.org
Subject: Radiation levels.
Hi all!
Could anyone tell me the radiation
case) as
milli.
The 1998 EMC Encyclopedia shows M = mega and m = milli.
Mike Hopkins
KeyTek
-Original Message-
From: Gary McInturff [SMTP:gmcintu...@telect.com]
Sent: Thursday, January 06, 2000 5:50 PM
To: 'Egon H. Varju'; EMC-PSTC
Subject: RE: Y3K
Oh my last birthday my
Our customers have asked us to supply a meter which can be used to
monitor/measure magnetic fields in Amps/meter for setting up tests IAW IEC
61000-4-8. We've been offering a meter made in the U.S that reads in Gauss
(seems okay for U.S. customers), but some customers in the far east are
sense.
If product committees want to use these for compliance, they are free to do
so, but the IEC guidelines in 1000-4-1 make it clear which have general
applicability and which do not. This one does NOT.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: Martin Rowe (TMW
Try Kalmus -- Leo Smale at leosm...@seanet.com or
11807 North Creek Parkway S.
Suite 109
Bothell, WA 98011
Tel: 1-800-344-3341 1-206-485-9000
Fax: 1-206-486-9657
Mike Hopkins
-Original Message-
From: dber...@wlgore.com [SMTP:dber...@wlgore.com]
Sent: Friday, November 19, 1999 11
Sounds like a definate maybe...
Mike Hopkins
-Original Message-
From: Muriel Bittencourt de Liz [SMTP:mur...@grucad.ufsc.br]
Sent: Wednesday, September 01, 1999 3:55 PM
To: Lista de EMC da IEEE
Subject: Doubt on household equipment interference
Dear Members
I'd
If I'm not mistaken, there IS an FAA regulation prohibiting the use of cell
phones in airplanes -- I have the regs at home and will look it up.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: miksher...@aol.com [SMTP:miksher...@aol.com]
Sent: Tuesday, August 24, 1999 11:13
mode and 2kV intervals for air discharge.
It's clear these requirements will go forward -- there's just too much
evidence for the existance of the phenomena, even though the reasons aren't
always clearly understood for a specific EUT.
Mike Hopkins
mhopk...@keytek.com
-Original Message
is now being circulated
that would allow TEM cells, but ONLY if a TEM wave can be demonstrated
throughout the frequency range being used (3-axis measurement, undesired
vectors 6 db down).
For emissions to EN's, TEM cells are not allowed for compliance testing.
Mike Hopkins
mhopk...@keytek.com
Having seen numerous postings relating to job openings in EMC, I trust the
following is not out of line:
Electronic Design Engineer Position
Senior electrical/electronic engineer with analog design background to work
on design of KeyTek's pulsed-EMI (surge, EFT) and ESD test systems. The
to the load. If this extra line is a
single line and not paired with a return, it will likely operate as an
antenna. If that line were the same impedance as the load, half the energy
from the source would go to the antenna and half to the load...
Mike Hopkins
mhopk...@keytek.com
-Original Message
the higher levels are required NOT because ESD is more of a problem,
but because a failure could be more catastrophic than in your average
office. Improper switching could cause realitively large scale outages and
possible damage to the system.
Mike Hopkins
mhopk...@keytek.com
-Original
than 42 ohms (if it's only
42 ohms for the surge voltage frequencies, you'll only get 50% of the
desired surge voltage -- ohms law). Anyway, it isn't simple. If someone does
have a good way of increasing the signal frequency capability of the CDN's,
we'd like to hear about it.
Mike Hopkins
mhopk
as soon
as you entered the sub-station..
Mike Hopkins
-Original Message-
From: b...@namg.us.anritsu.com [SMTP:b...@namg.us.anritsu.com]
Sent: Wednesday, March 31, 1999 5:36 PM
To: emc-p...@ieee.org
Subject: ESD in Power Station
Hi,
Please allow me to pose two questions
discharge
from the end of your finger is something you'd remember! Even 10kV is pretty
uncomfortable..
Hope this is helpful, but I doubt it would influence the people who wrote
the standard...
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: s_doug...@ecrm.com [SMTP:s_doug
simultaneously with respect to ground), but there are also 4-wire tests
(two, 3-wire pairs) and 12 pair tests. Additionally there is a 10/250us
impulse used for coaxial lines that is HUGE energy...
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: tdonnelly [SMTP:tdonne
of that My own opinion is that the manufacturer in any country
can sign a Declaration of Conformance, but it must be kept on file in the EU
by a representative of the manufacturer or by the importer.
Happy Holidays to all
That's all the document research time I have this month
Mike Hopkins
That's certainly our interpertation. We do the tests here, sign the DofC
here, then place a copy on file with one of our divisions in The
Netherlands.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: Robert Tims [SMTP:rt...@emx.ericsson.se]
Sent: Tuesday, December 15, 1998 1
or adjecent to I/O
lines. It's not likely the signals would be coupled to one line and not to
another; in fact, because of the very fast pulses, everything gets very well
coupled very quickly.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: Collins, Erik D. [SMTP:collin...@lxe.com
for things like 48VDC lines up
to 20-30A.
Let me know if you want more information.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: salba...@hns.com [SMTP:salba...@hns.com]
Sent: Tuesday, December 08, 1998 5:04 PM
To: emc-p...@majordomo.ieee.org
Subject: Transient/Surge
I've been asked about testing and certification requirements for MITI but
have been unable to locate any information. Anyone out there know where i
can find such ?? Tried their web page, but couldn't see anything about
testing requirements.
Thanks,
Michael Hopkins
mhopk...@keytek.com
Tel:
.
Hope this helps.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: Bailey, Jeff [SMTP:jbai...@sstech.on.ca]
Sent: Friday, October 09, 1998 12:53 PM
To: 'EMC-PSTC'
Subject: IEC 1000-X-X vs EN 61000-X-X
Hello group,
I currently have a number of the IEC 1000-X-X
may be minimal, but why take any at all.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: lfresea...@aol.com [SMTP:lfresea...@aol.com]
Sent: Tuesday, October 06, 1998 3:36 PM
To: emc-p...@majordomo.ieee.org
Subject: Room grounding
Chaps,
The grounding of a shield
I can recommend Transient Speialists, Tel: 708 246 3297; fax 708 482 3972 or
email lpit...@aol.com. They will do short term rentals plus provide some
support.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: Bailin Ma [SMTP:b...@namg.us.anritsu.com]
Sent: Wednesday, October
one, but if I had to guess, I'd say it will end up being actual power being
taken by the device during the test.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: Crabb, John [SMTP:jo...@exchange.scotland.ncr.com]
Sent: Friday, October 02, 1998 4:35 AM
To: emc-p...@ieee.org
I've ordered the chart in June and recieved a post card thanking me for
the order and notifying me that the charts are back ordered -- no idea
when I'll recieve it.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: ed.pr...@cubic.com [SMTP:ed.pr...@cubic.com]
Sent: Thursday
of such a
study, I'd love to see it.
Mike Hopkins
mhopk...@keytek.com
-Original Message-
From: Peter E. Perkins [SMTP:peperk...@compuserve.com]
Sent: Monday, August 10, 1998 2:01 AM
To: PSNetwork
Subject: Transient overvoltage field study paper
PSNet
info on a paper
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