Blush you appear correct. Availability error I guess. The most available
situation to my mind was my own recent DC situation. Actually, it makes this a
even more intersting question. I apologize if I confused anyone
Gary
-Original Message-
From: Yow, Steve (IndSys, GEFanuc, NA)
It seems like there are two issues here. The first would be the variability
for identical products using the same test setup at the same test lab. I
think that's what this thread is about so far.
The second issue would be the variability for a given product and test setup
at different test
-Original Message-
From: Michael Heckrotte [mailto:m...@precisioncal.com]
Sent: Tuesday, December 18, 2001 10:32 AM
To: Wan Juang Foo
Cc: EMC-PSTC
Subject: Re: Enclosed OATS facilities in snow country
All the various standards specify that a metal ground plane be used for
an OATS.
All the various standards specify that a metal ground plane be used for
an OATS. This is to alleviate the problem with variations in the
conductivity of the ground, due to water table variations at any one
site or due to different soil and base materials among sites. If the
level of the water
I hold with the 3 db under class B, as well as A. The only effective
argument, in my mind, is the uncertainty of measurement issue. Beyond that I
find that if I have 3 db everywhere my measurements next time down with that
product or with one off the shelf have also been compliant. So
I couldn't find a requirement either when I looked under various
standards that I have to comply with 55024 which calls out the 82-1
requirements, NEBS and some ETSI standards. I was a little more concerned
because the equipment I am looking at is actually outdoors so there will be
Check Nicolet's website [ http://www.nicolet.com http://www.nicolet.com
] application notes.
For effuent monitoring with FTIR you need to determine the spectral line(s)
of interest and set up instrument parameters to capture and record changes.
Knowledge of the process in question as well as
I read in !emc-pstc that richwo...@tycoint.com wrote (in 846BF526A205F8
4BA2B6045BBF7E9A6ABC4F94@flbocexu05) about 'EMC and Functional Safety',
on Tue, 18 Dec 2001:
A few weeks ago, someone posted a question asking if excessive spurious
emissions would be considered a safety issue. The responses
I read in !emc-pstc that Michael Taylor mtay...@hach.com wrote (in
da60a3b237698944981e58ebf28d76d03dd...@iris.lvl.hach.com) about
'surges on 24VAC', on Tue, 18 Dec 2001:
As a matter of policy my company tests DC ports to the appropriate levels on
all products where we do not supply the external
It seems all the answers are for DC power. I thought the question was for
24V AC. At least that is how it read in the subject..
Any changes to the comments.
-Original Message-
From: Michael Taylor [mailto:mtay...@hach.com]
Sent: Tuesday, December 18, 2001 9:34 AM
To: 'KC CHAN
The temperature rating of the caps may be for different reasons.
Firstly electrolytic caps can leak the electrolyte if operated at too high
temperatures.
Secondly the MTBF of an electrolytic capacitor is related to the operating
temperature.
John Fee
National Electronics Technology Centre
Duncan,
I am not into physics, but I can give you a good direction. UL rates X and
Y-caps at 85 deg C max. There is a reason behind this and one way is ask a
UL capacitor expert. When you have find the information you need, please
share it with us.
This e-mail message may contain privileged
All,
I have seen lots of papers available on using FTIR analysis in particular
situations, but I have been unable to find any general standards on the use
of FTIR Analysis equipment in a general sense or in the specific sense of
monitoring effluent from a piece of chemical processing equipment.
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]
As a matter of policy my company tests DC ports to the appropriate levels on
all products where we do not supply the external DC Power Supply. As we
cannot guarantee the quality of the DC power supply the customer will use or
the installation, we assume the worst. In this instance you would be
Does anyone know of a resource for a summary of what was revised in IEC 61010-1
2nd Edition? I.E. what is the delta from the 1993 version?
Will EN 61010-1 soon be revised to match IEC 61010-1 2nd Edition?
Thanks
Jason Mallory
Product Safety Consultant.
--
I read in !emc-pstc that Hans Mellberg emcconsult...@yahoo.com wrote
(in 20011218072701.24359.qm...@web13003.mail.yahoo.com) about
'Harmonics, WAS: 2 Phases in North America', on Mon, 17 Dec 2001:
A harmonic frequency does NOT imply a multiplier of, but one that
sympathetically resonates with the
I read in !emc-pstc that Andrew Carson acar...@uk.xyratex.com wrote
(in 3c1f0c39.e42db...@uk.xyratex.com) about 'Sometimes product safety
just isn't enough', on Tue, 18 Dec 2001:
Griffins
or gryphons
Hypo Griffins
Hippogryphs, I think. Gryphons have a lion-like body, hippogryphs have a
A few weeks ago, someone posted a question asking if excessive spurious
emissions would be considered a safety issue. The responses indicated No.
I just found a copy of the IEE Guidance Document on EMC an Functional Safety
(http://www.iee.org.uk/Policy/Areas/EMC/index.cfm). The relationship of
Dear All,
Does anyone know how to measure the level of the water table around a
OFTS/OATS? I believe the answer is in the radiated emission measurements.
This thread made me to recall my experiences with snow in the North of
England. I have found out that ( if the snow does not start to
Griffins
Hypo Griffins
Pegasus
Dragons
To name but a few !
John Woodgate wrote:
I read in !emc-pstc that oover...@lexmark.com wrote (in 200112171644.LA
a08...@interlock2.lexmark.com) about 'Sometimes product safety just
isn't enough', on Mon, 17 Dec 2001:
There are, however, some winged
Cecil,
Ken is right, it could be a host of problems. Have you check the setup for
ground loops? The way you describe it, I suspect you are using a single
pair of power/ground plane on a multilayer board that did not isolate your
motor-driver-power/ground from your control electronics ground.
Hi Jennifer,
I would argue that the test should not be applied that port, simply because
that port is fed from a 24V supply upstream. It is perfectly reasonable to
specify in the product documentation that the supply upstream must meet the
requirements. Why make the compliance process more
I read in !emc-pstc that Wan Juang Foo f...@np.edu.sg wrote (in
of7b89ef09.2d45a212-on48256b26.0010c...@np.edu.sg) about 'Enclosed
OATS facilities in snow country', on Tue, 18 Dec 2001:
The maximum difference between
sample means are about 23 dB around the frequencies where at one time was
the
If one uses the analogies from tuning forks, then it should be obvious. The
first
harmonic or the fundamental, is the the first sympathetic resonance of the
adjacent
tuning fork which happens to be the fundamental. And, it so happens that by
definitions the first harmonic IS the fundamental. It
Jennifer,
I have instructed those clients I deal with to test the input as follows:
Get a transformer thats typical for your unit, and apply the surge to the
input of it. Keep the leads short.
By doing this you have made an attempt to met the standard. And, yes I know
it's not perfect, but it
Thanks for the update. The only systems I had seen (limited experience)
were on a hydroelectric dam and naval vessels.
Ghery
-Original Message-
From: Peter Tarver [mailto:peter.tar...@sanmina-sci.com]
Sent: Monday, December 17, 2001 12:20 PM
To: 'EMC-PSTC Forum'
Cc:
I am thinking if it is possible to connect the source input to the surge tester
to a DC source, instead of the AC source, then you can apply the surge tests to
the DC input of your product.
Jennifer Banh jb...@bb-elec.com 12/18/01 03:43am
Hello everyone,
I am currently trying to
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