power ground=signal ground?

Hi,
I am using a MEA with internal reference (electrode 15). I would like to know if electrode 15 is physically connected to the power ground INSIDE the MEA-1060 amplifier or later in the electronic chain? I mean, pin 1 of the MCS 68-pin cable (i.e. the power ground coming from the power supply) and pin 2 (i.e. the signal ground, taken from electrode 15, as I suppose) carry the same voltage signal?

thank you very much

Giulia

giulia wrote:Hi,
I am using a MEA with internal reference (electrode 15). I would like to know if electrode 15 is physically connected to the power ground INSIDE the MEA-1060 amplifier or later in the electronic chain? I mean, pin 1 of the MCS 68-pin cable (i.e. the power ground coming from the power supply) and pin 2 (i.e. the signal ground, taken from electrode 15, as I suppose) carry the same voltage signal?

thank you very much

Giulia

Hey, Giulia,

about electrode 15 i think you have to groud it by yourself, it is connected to the ground of MEA1060, see the pic2

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i don't understand why do you want to know about the 68-pin cable. but i think they don't have the same voltage, otherwise there will be no information between the MEA and Computer. my answer have no guarantee, but i hope i can help you a little.

Adam

Thank you Adam

So, 15 and GND (GND of the MEA1060 amplifier) are connected, i.e. they have the same voltage..

I don't understand why do you want to know about the 68-pin cable.

It's for my clarity

but i think they don't have the same voltage

If 15 goes to pin 2 (named as signal ground) and GND (GND of the MEA1060 amplifier, that is named as power ground) comes from pin 1, and 15 and GND are physically connected near the MEA, I deduce that pin 1 and pin 2 carry the same voltage... am I wrong?

yes, you are right, when they all are grunded, then voltage is 0, no doubt, i think.

Is there more information available about the pyhsical and eletrotechnical details of the standard-MEA? I don't found "deeper" informations about that in the document-sheets that can be downloaded here.

I don't want to know that things because of a clear purpose.
It's just, that I would like to understand the used techniques in detail.

Or are there any "early works" published, on the MEA-system, that support the physical basis of the signals measured and so on, that I'm not aware of?

Edit: I found this paper rather interesting and it cleared many of my questions (as a beginner, now starting to work with the MEA-system):

http://www.ncbi.nlm.nih.gov/pubmed/24137127