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 Post subject: Unit of GSR
PostPosted: Sun Oct 01, 2017 9:11 am 

Joined: Sun Oct 01, 2017 8:01 am
Posts: 18
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


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 Post subject: Re: Unit of GSR
PostPosted: Mon Oct 02, 2017 8:30 am 

Joined: Mon Sep 28, 2009 12:06 pm
Posts: 11292
Hello hhhddd,

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

Regards


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 Post subject: Re: Unit of GSR
PostPosted: Mon Oct 02, 2017 2:26 pm 

Joined: Sun Oct 01, 2017 8:01 am
Posts: 18
I see.
Thank you for the clarification :D

best regards


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 Post subject: Re: Unit of GSR
PostPosted: Tue Oct 03, 2017 8:11 am 

Joined: Mon Sep 28, 2009 12:06 pm
Posts: 11292
Hello hhhddd,

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

Regards.


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