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TSD203 Electrodermal Response Transducer

The TSD203 connects to the GSR100C amplifier for the purpose of skin conductance recording. Two Ag-AgCl, unpolarizable, electrodes are mounted in individual, ergonomically-designed, polyurethane housings for improved contact. The electrodes are attached to the fingers by Velcro® straps. The electrodes have a 6mm (dia) contact area with a 1.6mm cavity to accommodate electrode gel. The TSD203 incorporates shielded construction to minimize noise interference and improve recordings.

Usage Recommendations
When using GEL101 it is important that the gel has a chance to be absorbed and make good contact before recording begins. Accordingly:

  1. Abrade the skin at the point of electrode contact; you can use a nail file or an EL PAD abrasion pad.
  2. Apply GEL101 to the skin at the point of electrode contact and rub it in.
  3. Fill the TSD203 electrode cavity with GEL101.
  4. Attach the TSD203 electrode to the subject.
  5. Wait 5 minutes (minimum) before starting to record data.
To verify the Gain setting of the GSR100C:
  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 GSR100C is set to a Gain of 5 µmho/V, then 0V will map to 0 µmhos or infinite resistance and 1V will map to 5µmho or 200kohm.
  2. Place the lower frequency response to DC.
  3. Set the Gain switch on the GSR100C to 5µmho/V.
  4. Perform measurement with electrodes disconnected.
    · AcqKnowledge should produce a reading of 0 µmho.
  5. Insulate a 100kohm resistor and place it from electrode pad to electrode pad (resistor must be insulated from fingers).
  6. Perform measurement with electrode-resistor setup.
    · AcqKnowledge should produce a reading of 10 µmho.

TSD203 Specifications
Electrode Type: Ag/AgCl (unpolarizable)
Surface Area: 6mm contact area
Dimensions: 16mm (long) x 17 mm (wide) x 8mm (high) (each electrode)
Weight: 4.5 grams (each electrode)
MRI Compatible: Yes (no ferrous parts)
Sterilizable: Yes (see Biopac for details)
Cable Length: 3 meters (shielded)
Interface: GSR100C
TEL100C Compatibility: SS3A

Cleaning the TSD203:

  1. Do not leave GEL in the cavity after use. The electrode cavity must be left clean and dry. If GEL is left in the cavity, the Ag-AgCl electrode disk could degrade quickly with time because the electrode surface is somewhat porous to promote good conductivity to the GEL.
  2. To clean the reusable TSD203, use a cotton swab or toothbrush with tap water.
  3. Use any lab cleaner with pumice (such as Ajax) with a cotton swab or toothbrush to remove any dark residue from the electrode surface.
  4. Use Hydrogen Peroxide solution (2-3%) to brighten the electrode surface (optional) or to sterilize the electrode. Do not place the electrode in solution, but simply clean the electrode surface using a cotton swab. Dry the electrode off completely before storage.


    Electrodermal Response Transducer - TSD203 TSD203pad$125.00pad