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:

1. Fill the TSD203 electrode cavity with GEL101.
2. Attach the TSD203 electrode to the subject.
3. Wait 5 minutes (minimum) before starting to record data.

To verify the Gain setting of the EDA100C:

1. Calibrate AcqKnowledge 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 EDA100C 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.
2. Place the lower frequency response to DC.
3. Set the Gain switch on the EDA100C to 5 µmho/V.
4. Perform measurement with electrodes disconnected.
   AcqKnowledge should produce a reading of 0 µmho.
5. Insulate a 100 kohm resistor and place it from electrode pad to electrode pad (resistor must be insulated from fingers).
6. 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
• BioNomadix wireless option: BN-EDA-LEAD2 with BN-PPGED

Unit Note:

BIOPAC software calculates conductance 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.