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Unit of GSR
https://www.cooking-hacks.com/forum/viewtopic.php?f=39&t=10701
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Author:  hhhddd [ Sun Oct 01, 2017 9:11 am ]
Post subject:  Unit of GSR

Hi everyone

I looked at "FAQ E-Health - Read Before You Post" and found the description "GSR → Electrical conductance (Ohm)"

In my understanding, conductance is reciprocal of resistance.
So, skin conductance is generally shown with the unit "(micro) siemens".

I'm reading skin conductance using "eHealth.getSkinConductance();".
The values returned by this function generally range from 4.0 to 15.0.
#This is acceptable range if the unit is micro siemens.

At the same time, journal papers reporting GSR with Ohm unit report values ranging from 30-80 kilo (!) Ohms.

So if the unit of values returned by e-Health sensor is actually "Ohm" as described in "FAQ E-Health - Read Before You Post", it follows that measurement of GSR by e-Health platform is about 1/1000 of previously reported amplitudes of GSR :o

Am I totally wrong in my understanding?
Or would anyone explain what's happening?
#Or my skin is hyper-dry?

Best regards

Author:  libelium-dev [ Mon Oct 02, 2017 8:30 am ]
Post subject:  Re: Unit of GSR

Hello hhhddd,

Both data are inversely proportional. The unit given by "getSkinConductance" is microSiemens.
The unit given by "getSkinResistance" is Ohms.

Regards

Author:  hhhddd [ Mon Oct 02, 2017 2:26 pm ]
Post subject:  Re: Unit of GSR

I see.
Thank you for the clarification :D

best regards

Author:  libelium-dev [ Tue Oct 03, 2017 8:11 am ]
Post subject:  Re: Unit of GSR

Hello hhhddd,

you are welcome, thanks for your contribution to the forum.

Regards.

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