The TSD203 connects to the GSR100Camplifier for the purpose of skin conductance recording. Two Ag-AgCl, non-polarizable electrodes are mounted in individual, ergonomically-designed, polyurethane housings for improved contact and terminate in Touchproof connectors. The electrodes are attached to the fingers by Velcro straps. The electrodes have a 6 mm (dia) contact area with a 1.6 mm cavity to accommodate electrode gel. The TSD203 incorporates shielded construction to minimize noise interference and improve recordings.
Usage Recommendations
There must be good electrical connections between the skin and the electrodes for EDA to work properly. When using GEL101 it is important that the gel has a chance to be absorbed and make good contact before recording begins. Accordingly:
Fill the TSD203 electrode cavity with GEL101.
Attach the TSD203 electrode to the subject.
Wait 5 minutes (minimum) before starting to record data.
To verify the Gain setting of the GSR100C:
Calibrate Acq Knowledge for lower frequency response at DC: In the Scaling window, set the Input voltages so they map to the "DC" conductance ranges indicated by the sensitivity setting. For example, if the GSR100C is set to a Gain of 5 µmho/V, then 0 V will map to 0 µmhos or infinite resistance and 1 V will map to 5 µmho.
Place the lower frequency response to DC.
Set the Gain switch on the GSR100C to 5 µmho/V.
Perform measurement with electrodes disconnected. Acq Knowledge should produce a reading of 0 µmho.
Insulate a 100 kohm resistor and place it from electrode pad to electrode pad (resistor must be insulated from fingers).
Perform measurement with electrode-resistor setup. Acq Knowledge should produce a reading of 10 µmho.
Alternatives
Disposable option: EL507 Disposable EDA electrode with LEAD110A Electrode Lead
BIOPAC software calculates GSR in µMho, the traditional unit of conductance. Micromho (µMho) is interchangeable with the alternative microsiemen (µS). To use Ohm, the traditional measure of resistance, convert as 1 µMhos equals 1,000,000 ohms.
BIOPAC software calculates GSR in µMho, the traditional unit of conductance. Micromho (µMho) is interchangeable with the alternative microsiemen (µS). To use Ohm, the traditional measure of resistance, convert as 1 µMhos equals 1,000,000 ohms.
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