You are here:   Products
  |  Login

Categories

Minimize

All Products

Enquiry List

Minimize

Your Enquiry List is empty

Products

Minimize
Transducer Amplifiers
EDA Scoring

Biopac EDA100C - Electrodermal Activity Amplifier

The EDA100C (formerly GSR100C) measures both the skin conductance level (SCL) and skin conductance response (SCR) as they vary with sweat gland (eccrine) activity due to stress, arousal or emotional excitement. The EDA100C uses a constant voltage (0.5 V) technique to measure skin conductance. The controls allow selection of absolute (SCL+SCR) or relative (SCR) skin conductance measurements.
Code
EDA100C

Biopac EDA100C - Electrodermal Activity Amplifier

Formerly known as the GSR100C, the EDA100C measures both the skin conductance level (SCL) and skin conductance response (SCR) as they vary with sweat gland (eccrine) activity due to stress, arousal or emotional excitement. The EDA100C uses a constant voltage (0.5 V) technique to measure skin conductance. The controls allow selection of absolute (SCL+SCR) or relative (SCR) skin conductance measurements.
 
AcqKnowledge includes a fully automated electrodermal response scoring tool that locates skin conductance responses, visually identifies them in the record and measures them. It also automates event related potentials (ERP) analysis by locating the onset of the stimuli and identifying a valid SCR. See the Applications > Psychophysiology Area for further information.
 
Each EDA100C amplifier requires one set of the following electrode combinations:

2 x LEAD110A Electrode Leads (Recommended)
2 x EL507 Disposable Electrodermal Electrodes (Recommended)

or

1 x TSD203 Ag-AgCl Skin Resistance Transducer
1 x GEL101 Electrodermal Gel

or

2 x EL258 Ag-AgCl Lead Electrodes
1 x ADD208 Adhesive Disks
1 GEL101 Electrodermal Gel

Usage Recommendations:
When using the EL507 wait 5 minutes (minumum) before starting to record data.
When using GEL101 it is important that the gel has a chance to be absorbed and make good contact before recording begins. Accordingly:

   1. Apply GEL101 to the skin at the point of electrode contact and rub it in.
   2. Fill the TSD203 electrode cavity with GEL101.
   3. Attach the TSD203 electrode to the subject.
   4. Wait 5 minutes (minimum) before starting to record data.

Calibration
To set up AcqKnowledge to record skin conductance directly, perform the following:
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 0V will map to 0 µmhos or infinite resistance and 1V will map to 5µmho or 200kohm.
 
Lower frequency response at 0.05 Hz
 In the scaling window, set the input voltages so they map to the 0.05Hz conductance ranges indicated by the sensitivity setting. For example if the EDA100C is set to a Gain of 5 µmho/V, then 0V will map to X µmhos and 1 V will map to (X+5) µmhos, where X is the mean conductance being recorded.

To verify the Gain setting of the EDA100C:

   1. Calibrate AcqKnowledge as detailed above for lower frequency response at DC.
   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.
          * AcqKnowledge should produce a reading of 10 µmho.


EDA100C  - GSR EDA Galvanic Skin Response Amplifier Specifications:

Gain: 20, 10, 5, 2 µsiemens/volt (i.e. µmhos/volt)
Low Pass Filter: 1 Hz, 10 Hz
High Pass Filter: DC, 0.05 Hz, 0.5 Hz
Sensitivity: 0.7 nano-siemens (with MP System)
Constant Voltage Excitation: Vex = 0.5 VDC
Output Range: ±10 V full range (analog); 0-10 V nominal range
INPUT SIGNAL RANGE
Gain Range (µmho)
20 0-200
10 0-100
5 0-50
2 0-20



Note: Normal human range is 1-50 µmho.

Unit Note—BIOPAC software calculates SCL/SCR 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 µmho equals 1,000,000 ohm.