Bob et al,
The 1 MHz demarcation is an arbitrary, historical division between
electrical safety folks and EMC folks.
From a physiological point of view the model of the body at very HF
(>1 MHz, etc) is not well described by a simple electrical model. Workers
in the field are now moving to a full body model built from MRI/CAT scan
data in which each body element (on the order of a few mm or smaller) are
defined by tissue (bone, blood muscle, etc) and assigned electrical
parameters appropriate for the frequency being investigated. This is
usually run on a pretty hi powered computer.
Most of this is so complex that it is being done by Univ researchers
and their graduate students, who, as you might expect, publish the results
at a high level to get proper credit for the work & enhance their
credentials. You can find some of their papers by searching from the Inet.
You may be familiar with some of the work on the effect of cell
phone RF on the human head; this is one of the typical studies done this
way.
There is a body model available that will run on PCs (but I don't
have it) that works this way (but, apparently, not as fine grained as some
of the Univ models). One paper that I have seen privately discussed took
many 10's of hours per case on an engineering level PC. It appears to be
able to give reasonable results.
I would encourage anyone on this list to pursue this approach if
they have a serious interest in the flow of electric current in the body.
So, now you know. Thanx for asking.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety Engineer
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201 fone/fax
[email protected]
From: [email protected] [mailto:[email protected]]
Sent: Friday, October 31, 2008 5:06 AM
To: Pete Perkins
Cc: [email protected]
Subject: RE: Touch test
Pete (or anyone on the list), do you know of a human body circuit model
that is above 1 MHz? The circuits that are talked about below only go to a
megahertz.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
===========================================================
"Pete Perkins"
<[email protected]
om> To
Sent by: "'Mike Hurley'"
[email protected] <[email protected]>
<[email protected]>
cc
10/16/2008 11:25
AM Subject
RE: Touch test
Mike,
The Touch Current test circuits are taken directly from IEC
60990 (Measurement of Touch Current and Protective Conductor Current).
A collection of Touch Current measurements measured with the
circuit that includes the frequency compensation network shown in these
standards (called the Perception-Reaction network) can be found at
www.safetylink.com by searching on perkins.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety Engineer
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201 fone/fax
[email protected]
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Mike
Hurley
Sent: Tuesday, October 14, 2008 7:35 AM
To: [email protected]
Subject: Touch test
Can anyone tell me if the touch test circuits of 60950 and 60065 are
the same?
Mike Hurley
Director
Mead testing ltd
[email protected]
www.meadtest.com
phone 44 (0) 1279 635865
fax 44 (0) 1279 635874
Mead Testing Limited is a company registered in England with company
number 4572600 whose registered office is: Unit 25 Mead Park, River
Way, Harlow, CM20 2SE. VAT number: 802 3904 59
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