[Eeglablist] How to detect which electrode is broken?

[Daniel Alschuler]

Dear Mar,

We also have an active system, and we occasionally have the same problem. Here is how we identify a shorting electrode:
1. Plug all electrodes (including active electrodes) into amplifier, and place electrode tips into a cup of saline (1 tsp non-iodized salt per L filtered water).
2. Remove electrodes from the cup until the system stops shorting. If the system starts shorting again when an electrode is put back in the cup, that is the shorting electrode.
3. If the system is shorting with only the active electrodes in the cup, then there is a problem with either the active electrodes or the amplifier.
4. Rinse electrodes with filtered water.

Good luck,
Dan Alschuler

Psychophysiology Laboratory
Division of Cognitive Neuroscience
New York State Psychiatric Institute
________________________________
From: eeglablist-bounces at sccn.ucsd.edu [eeglablist-bounces at sccn.ucsd.edu] on behalf of Makoto Miyakoshi [mmiyakoshi at ucsd.edu]
Sent: Friday, May 16, 2014 11:35 AM
To: Mar Gonzalez; Tyler
Cc: eeglablist; Birgit Nierula
Subject: Re: [Eeglablist] How to detect which electrode is broken?

Dear Tyler,

Have you experienced this before? If so, would you advise him please?

Makoto


2014-05-15 7:27 GMT-07:00 Mar Gonzalez <margonzalezfranco at gmail.com<mailto:margonzalezfranco at gmail.com>>:
Dear all,
We are using active electrodes and apparently one of them seems to be broken and generating a court circuit.

We would like to find out which one it is. Does anyone has any tips on how to proceed?

thanks
Mar


----------------------
Mar Gonzalez-Franco
PhD Student and FI-DGR fellow
Experimental Virtual Environments for Neuroscience and Technology Laboratory
Universitat de Barcelona

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--
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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