1 degree per hour, I think you meant, not per second?
John C
_
From: Steli Loznen [mailto:st...@itl.co.il]
Sent: 11 January 2012 12:33
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Steady State Conditions
Hi Jacob,
In some testing procedures, the temperature steady
The IEC offers several definitions of thermal equilibrium in
its Glossary.
thermal equilibrium conditions
stable temperature conditions indicated by temperature
changes of no more than 3 K (5 °F) or 1 % of the absolute
operating temperature, whichever is higher between two
readings 15 min
Luminaires 60598 has 1 degree per hour, just to add another variant.
John C
_
From: Mick Maytum [mailto:m.j.may...@ieee.org]
Sent: 12 January 2012 10:47
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Steady State Conditions - née thermal equilibrium
The IEC offers several
BS 1363-1 also states temperature stability being taken as less than 1K
rise within 1 h. I'm sticking with 60335-2-6, less than 1K in 15 min. From
experience components used in the appliances I test tend to saturate way
before the 15 minute period. Thanks again for all the feedback.
Jacob.
In message 4f0eba2a.8070...@ieee.org, dated Thu, 12 Jan 2012, Mick
Maytum m.j.may...@ieee.org writes:
Nice to see a harmonised approach from the various IEC TCs
The 60034 definition might be taken as more 'horizontal' (i.e. a
reference definition that other committees should adopt) than the
In message 2CE75112DCA946C0B34BC8A9F9EBACF0@LENVOR61iJOHN, dated Thu,
12 Jan 2012, John Cotman john.cot...@conformance.co.uk writes:
Luminaires 60598 has 1 degree per hour, just to add another variant.
A not practical one: fluctuations of more than that typically occur in
test area ambient
A not practical one: fluctuations of more than that typically occur in
test area ambient temperatures, especially one that contains a 2 kW
lamp!
Steady state is reached when the *difference* between the ambient temperature
and the test subject temperature levels out, you need to be monitoring
In message 20120112120006.5...@gmx.com, dated Thu, 12 Jan 2012,
Anthony Thomson ton...@europe.com writes:
A not practical one: fluctuations of more than that typically occur in
test area ambient temperatures, especially one that contains a 2 kW
lamp!
Steady state is reached when the
TC 1 controls the IEC IEV. There you find in the fundamental
definitions
Area Electrical and magnetic devices / Operating
conditions and testing
IEV ref 151-16-33
thermal equilibrium
state reached when the temperature of the parts of
a component or equipment
In message 4f0edf9b.8060...@ieee.org, dated Thu, 12 Jan 2012, Mick
Maytum m.j.may...@ieee.org writes:
TC 1 controls the IEC IEV. There you find in the fundamental
definitions
Area Electrical and magnetic devices / Operating conditions and
testing
IEV ref 151-16-33
thermal
Following the 60335 series standards it explains that monitoring
temperature involves recording delta T (temperature rise), this is the
temperature which is used when considering steady state conditions.
Jacob
From:
John Woodgate j...@jmwa.demon.co.uk
To:
EMC-PSTC@LISTSERV.IEEE.ORG
Date:
Interesting article and findings by John Hopkins University...
http://gazette.jhu.edu/2012/01/09/discovery-warns-of-catastrophic-failure-of-lithium-ion-batteries/
John Allen
Product Safety Consulting, Inc.
605 Country Club Drive, Suites I J
Bensenville, IL 60106
P - 630 238-0188 / F - 630
Forgot to ask - I believe current Standards require thermal protection, but are
they enough?
John Allen
President
Product Safety Consulting, Inc.
605 Country Club Drive, Suites I J
Bensenville, IL 60106
P - 630 238-0188 / F - 630 238-0269
1-877-804-3066
That's a very good question, especially considering that lithium ion batteries
are making their way into electric vehicles:
http://spectrum.ieee.org/green-tech/advanced-cars/lithium-batteries-for-hybrid-cars
The potential safety issue seems to be downplayed by the last paragraph in the
Hello All,
What is the requirement/certification needed for cells to ship to Japan.
Thank you.
-Ebenezer
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
METI DENAN approval is required for some batteries. You can find Japanese
regulations for lithium-ion batteries on the METI web site.
http://www.meti.go.jp/english/policy/economy/consumer/pse/
Scroll down towards the bottom of the page to find information on the
regulations, enforcement and
With just about everything now manufactured in developing countries with
inexpensive labour, I wonder
if quality control of these batteries could be a contributing factor
towards acute thermal failure. As I understand it, of this battery
chemistry is charged/discharged correctly, there
Dear Members,
I have a contractor performing NSA today. When the center of the biconical
antenna is located right at the 2 meter peripheral, NSA doesn't meet the 4
dB requirements. In order to meet the 4 dB requirement, the antenna must
be moved inward until the tip of the biconical antenna
In message
CAJq2vagRL0G4aQuE=fyh7mqo-32jhnawkrndod2465zyr79...@mail.gmail.com,
dated Thu, 12 Jan 2012, Grace Lin graceli...@gmail.com writes:
. I cannot remember how NSA was performed when the chamber was built
four years ago
I can't answer your question, but I recommend you take
http://blogs.scientificamerican.com/observations/2011/11/29/could-chevy-volt-lithium-ion-battery-fires-burn-out-interest-in-evs-and-hybrids/
These conditions were certainly quite abnormal, but it is interesting that the
fires were not initiated immediately following the crash tests.
Scott
I don't know about all the cases of fires associated with the battery pack
in the Chevy Volt, but the fire that started two weeks after the test
crash was not initiated by the lithium-ion cells, but rather by the liquid
battery coolant (external to the cells) that dripped on a circuit board
Quality control is probably the most significant factor, with the correct
implementation of protection circuits a close second.
I'm not saying that there aren't better programs out there, but am quite
impressed with the CTIA's battery system certification program as it
addressed Quality and
As I understand it, there are different lithium-ion battery chemistries,
so not all Li-I batteries are susceptible to starting a fire.
Donald Borowski
EMC Engineer
Schweitzer Engineering Labs
Pullman, Washington, USA
From: ralph.mcdiar...@schneider-electric.com
To:
I'd leave the access point outside the chamber and run a coax through a
bulkhead to the antenna inside the chamber (and turn the power down to 1/4
or 1/8 power on the AP).
Other than that, use a low-pass filter just under the 2.4 GHz band to knock
the fundamental out of your measurement results -
Sounds wrong! Needs more info.
Sent from my MetroPCS Wireless Phone
Grace Lin graceli...@gmail.com wrote:
Dear Members,
I have a contractor performing NSA today. When the center of the biconical
antenna is located right at the 2 meter peripheral, NSA doesn't meet the 4
dB requirements. In
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