Gary,
The modeling of the human body from an electrical point of
view has been going on for almost 100 years with major strides in
understanding in the '40s & 50's and major gains again in the '90s with the
advent of CAT/MRI scans providing overload detail in the body construction.
The developers of IEC 61201, 'touch voltage threshold values
for protection against electric shock', have used commonly accepted values
in developing their evaluation as presented within that standard.
Specifically, the capacitance of human skin used is in the
range of 0.01 uF/cm2 to 0.05 uF/cm2 with a median value of 0.03 uF/cm2.
Fingertip contact is in the range of a few cm2, from my experience.
Perhaps this is adequate info for you to move ahead in your
work.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety Engineer
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201 fone/fax
[email protected]
_ _ _ _ _
Trying to set up a jig to test some capacitive touch-panels. It's an
automated probe that disturbs the capacitive field of the sensor - but I'm
clueless what kind of value to shoot for. I thought about the ESD gun
capacitance but I don't know if that actually matches a human fingertip - or
it's the whole body, or that the capacitance of the body of the ESD gun
itself is used to calibrate to some human figure tip capacitance.
I've got some research to do but does anybody have a starting point and a
reference for the capacitance of an average human fingertip. I have the EE
working the design to go back to the component supplier but haven't heard
back from them yet.
Thanks
Gary McInturff
Reliability/Compliance Engineer
Esterline Interface Technologies
Featuring
ADVANCED INPUT, GAMESMAN,
and LRE MEDICAL products
600 W. Wilbur Avenue
Coeur d'Alene, ID 83815-9496
Toll Free: 800-444-5923 X1XXX
Tel: (208) 635-8
Fax: (208) 635-8
www.esterline.com/interfacetechnologies
Technology, Innovation, Performance.
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