Hi Ron:
I have come across a problem where a product is exceeding 3.5 ma of touch
current. The product in question has 2 line filters and 4 Switching Mode
Power Supplies. Because of the addition of the fourth power supply the
overall touch current can be as much as 4.0 ma. Ideally,
Pat,
I use a TEM cell for some IC measurements and can answer a couple of your
questions. My answers are in BLUE below.
Dave Cuthbert
Micron Technology
From: owner-emc-p...@listserv.ieee.org
mailto:owner-emc-p...@listserv.ieee.org] On Behalf Of pat_law...@condordc.com
Sent: Wednesday,
Bill Bisenius wrote:
I am trying to assist some hospitals in our area who are working to
assess
the Leakage Current Hazards in their medical facilities. I believe a lot of
this relates to the growing abundance of ITE products in medical facilities
= in their words flat screen monitors are
Hi:
I was given some literature by management recently advertising the use of a
TEM cell for radiated emissions:
http://www.wavecontrol.com/index2004.php?idioma=2
Our people have the impression that a TEM cell small enough to fit on a
table-top could eliminate the need to go to the local
Bill, et al,
To help bring about a better understanding of the basic issues involved,
this is a summary of some specific work.
There is a large ongoing work within the IEC regarding leakage current
issues.
IEC 60479 deals with the effects of current on the human body. This
APC is seeking candidates for the position of Senior Compliance Engineer.
The successful candidate will provide regulatory engineering review,
planning, testing, report administration and guidance; be responsible for
the execution of regulatory approval activities; and maintain industry
contacts
Hi Bob:
A Google search for ETSI TR 100 0TT returns:
http://portal.etsi.org/erm/EG202150/tr_1000TT02v010004m.doc
It's unfortunate that ETSI can't find information that 3rd party search
engines can!
Pat Lawler
EMC Engineer
Condor DC Power Supplies, Inc.
(805) 486-4565 extension 168
(805)
This is a multi-part message in MIME format.
Ron,
I don't quite sure if you are just trying to understand the problem or fix the
problem.
The leakage current is primarily caused by the Y caps in the line filters and
power supplies. Here is what you can do to reduce the problem.
1. Change the
10th Annual Northeast Product Safety Society Vendors Night
5:00 PM to 9:00 PM Wednesday 17th November
Holiday Inn Marlboro Massachusetts
This years show promises to be the biggest and best yet with over 40
Vendors lined up to show their products and services.
In addition to the world class
Ron,
I have conducted hundreds of leakage current tests but never personally
redesigned a product to reduce leakage, so here is my no previous experience
input:
My guess is that your leakage current is predominantly line frequency (you may
wish to confirm by looking at the leakage current
Hi Ron,
This sounds like a problem I ran into before. I assume that the
standard is 60950-1.
If the unit has 2 power cords and can it operate with only one
connected, you only have to measure the touch current with one
power cord connected. Refer to 60950-1 clause 5.1.2 Equipment
under test (EUT)
Bill -
Brian is right - the hospital shouldn't permit use of equipment in the patient
environment if it is failing to meet the leakage current limit requirements
for medical equipment. Your hospital administrators may well not see the point
- does the hospital not have a clinical engineering
Is anyone aware of what may have happened to the following ETSI Technical
Report:ETSI TR 100 0TT-2 V1.0.4 (2002-12)
The title of the report is:
Appropriate TB [e.g. Electromagnetic compatibility and Radio spectrum
Matters (ERM)] Test Report Form for use in third party testing to EN
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