Posted on behalf of a colleague:
The Electric Strength test conducted after abnormal testing in accordance with
IEC 60950 may be performed at room temperature, after the EUT has cooled down.
5.3.8.2 says the test is to be conducted in accordance with 5.2.2. 5.2.2 does
not say anything
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
Hi,
I don't see any reason why not. I think you can even ask for an official
opinion on the same subject from two different NB.
The only rule I know of is that you can not make application to two Notified
Bodies for the same device (i.e. MDD, Annex III, paragraph 2, third -) or
quality system
Hi Ned
Try 3M.
They have some static monitor like 711 charge analyzer and 709 static
sensor.
You can find more informations about ESD at www.3m.com/ehpdl.
Sérgio L. Rocha Loures
Siemens Ltda.
ICN FL EL
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It is allowed but what about the integrity issue?
Do you intend on telling the agency from which you are seeking the opinion of
your approach?
How would you feel about your customers doing the same thing with your opinion?
woods%sensormatic@interlock.lexmark.com on 12/16/99 02:42:26 PM
Is it allowed to obtain an official opinion from a Notified Body on one
particular issue and obtain an official opinion from a second Notified Body
on a different issue where the issues are not related?
Richard Woods
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Peter,
I don't know where it's actually spelled out but, I've always checked electric
strength immediately following abnormals (blocked vent / rotor). This is when
insulation is most likely to degrade or fail.
George
-Original Message-
From: pmerguer...@itl.co.il
Chris,
It is not a requirement to be seperate. You can still use a double
nut/stud combination, but the green/yellow must be the bottom wire, and have
its own nut and lock washer. The rational is pretty straightforward. The
main idea is that this wire not be removed during servicing,
Ned,
Any calibrated static charge meter should work ok. They run about $400 to
$600 dollars from many vendors (ACL, 3M, Ion Systems, etc.). You probably
will want to test worst case - dry pump, gloved hand, unit sitting on an
insulated
surface. One person pumps while the other holds the meter.
Egon Varju has kindly sent me the new 1999 CENELEC List of Decisions re
EN 60950.
I have now placed this on my website as file
http://www.lyons.demon.co.uk/cenlec99.pdf (59 kB)
This replaces and updates the 1997 and 1998 files but note the new file
is in .PDF format whereas the
-Original Message-
From: Grasso, Charles (Chaz)
Sent: Thursday, December 16, 1999 10:58 AM
To: 'Signal Integrity'
Cc: Charbonneau, Richard A
Subject: Embedded Capacitance Project
Hello,
Please find attached information regarding the NCMS Workshop
on Embedded
Just remember to burn off the lighter fuel first. Do that
outside. You may also have to file down any burrs in the outer
tube, too. Sparks will take the shortest distance they can find
to discharge.
Scrape off some paint from the outer tube to attach a ground
return wire. Solder it in place if
Hi Peter:
After an Abnormal Test for UL1950/EN60950, should the Electric Strength be
done a) immediately after the Abnormal Test or b) after Abnormal Tesrt when
unit has cooled down to room temperature c) after Abnormal Test when unit
has cooled down to Normal Heating Temperature
You can measure that with a 40KV probe and a digital storage scope set for
single shot event. i.e the scope triggers from the event. Probe loading
should be as low as possible ( hi Z probe).
Ralph Cameron
- Original Message -
From: carlos.perk...@eu.effem.com
To: emc-p...@ieee.org
Some time ago Phillips Telecom Web - Worldwide List of PTT's Telecom
Authorities had a web site that listed the world agencies for telecom
approvals. This seems to have been moved or lost. Does anyone know the link
to it if it still exists?
Jim Allan
Senior Compliance Engineer
Milgo
Ned,
I have used the John Cubb meter successfully many times,
I have made measurements of vehicle dashboard areas using the JCI unit to
measure electrostatic charge. This measures the charge without any contact
to the unit under test. The unit measures charge through an aperture at the
front
Dear All,
After an Abnormal Test for UL1950/EN60950, should the Electric Strength be
done a) immediately after the Abnormal Test or b) after Abnormal Tesrt when
unit has cooled down to room temperature c) after Abnormal Test when unit
has cooled down to Normal Heating Temperature Levels.
The
Hello,
I need some help from the ESD experts. I am trying to find a way to measure
the electro-static build-up on a hand operated pump. The device is used to
suck out the gas from small gas engines before the service. Obviously, an
ESD event would not be a good thing. We are trying to
Dear All,
Does anyone out there know what the peak voltage of a handheld piezo gas
lighter is? Or how to measure it?
Any tips would be very welcome.
Many thanks,
Carlos.
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Hi Rich.
You wrote:
There are two kinds of circuits that may be connected
to the equipment protective earth terminal:
1) Protective earthing circuits.
2) Functional earthing circuits.
Protective earthing wiring must be colored green/yellow.
Functional earthing wiring can be colored
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