Resistance and Capacitance of a human

[SolarTorch]

high voltage human capacitance

Anyone know the resistance and capacitance of a human?

 

[IanP]

human capacitance resistance model

Below you can find the Human Body Model used in simulation of ESD discharges ..
For more details goto:
https://www.analog.com/UploadedFiles/Associated_Docs/313320057Section7.pdf

Regards,
IanP

 

[SolarTorch]

is the resistance in a human skin body low?

There are some different between the Human model and the real measurment. When I measure myself, I find the resistance is in M-ohm order (hand to hand).

 

[IanP]

how to measure the low resistance of the skin

That depends on how dry is your skin .. dry skin measurement ≠ body resistance ..
" If you lick your palm and touch the wires against it again, the red light should come on brightly "
See:
**broken link removed**
for some additional hints ..

Regards,
IanP

 

[xxargs]

There are some different between the Human model and the real measurment. When I measure myself, I find the resistance is in M-ohm order (hand to hand).

human skin is very unliniar depend of voltage and time under voltage

Low voltage as measure with Ohm-meter give very high Ohm value, but >50 Volt possible give a Hazard current (>20 mA) and resistans low as 2.5 kOhm depends of chloride Ione build in skin (elecrolyze) and make easier conduct for current...

High voltage discharge value is very differ compare to low voltage discharger value.

For RF-frequency you have other models differ from above and depend of frequencys.

 

[SolarTorch]

How about the capacitance for the Human? Is it also voltage depended?

 

[electronics_kumar]

a dry body will have 50kohms

 

[xxargs]

How about the capacitance for the Human? Is it also voltage depended?

I think not.

capacitive is depend of electrostatic field between body and enviroment. Unless not using voltage depend capacitance in shoes etc., i think body capacitanse is voltage independ and constant.


Skin resistanse is important factor to make discharge model for caclulate ESD-damage

ie capacitans holds enegy and skin resistanse make how fast this discharge.

10 - 15 kV storing static charge in body breaks easy high resistance barriere in skin and make low resistance path in skin and result high current discharge pulse on target

(break down in skin have simular mechanism as High voltage discharge on circurit boards make small, small carbon trace on boards surface or inside board mass and can newer witdstand same high voltage again and in most case must replace with new equipment)

 

[SolarTorch]

10 - 15 kV storing static charge in body breaks easy high resistance barriere in skin and make low resistance path in skin and result high current discharge pulse on target

In this premiss, the capacitance also changed because of the dielectric has been changed, am I right?