GSR Amp

Overview:

The FE116 GSR Amp is a fully isolated Galvanic Skin Response amplifier with low voltage, 75 Hz AC excitation and automatic zeroing. The low-voltage AC excitation reduces the electrode polarization artifacts found in DC systems.

The GSR Amp is isolated for subject safety, and approved to the IEC 60601-1 standard. The unit is supplied with Bipolar Finger Electrodes (ML116F) and Velcro^® straps. The straps are suitable for adults. Also available for purchase and use with the GSR are the MLT117F MRI Safe bipolar finger electrodes (5m). Please visit our website for more details of our safety standards.

Hardware:
ADInstruments signal conditioners only function with PowerLab data acquisition units and therefore are not suitable for use with other data acquisition systems.

Features:

• 75 Hz oscillator which supplies a near square wave, low-impedance, low-voltage (22 mV_rms) signal to an electrode on one finger of the subject.
• Galvanic isolation for subject safety and approval to the IEC601-1 standard for human connection as a body protected (BF rated) instrument.
• Automatic zeroing
• MLT116F Bipolar Finger Electrodes and adult Velcro® straps

Applications:

The FE116 GSR Amp is used to measure the Féré effect, a general measurement of autonomic nervous system activity. It can be used to analyze the startle response to visual, auditory or somatosensory stimuli in human subjects.

Specifications:

Input

• Connection type: 2 × 4 mm (0.16") shrouded banana plugs to custom cable. Two dry, bright-plated, bipolar electrodes with Velcro™ attachment strap suitable for adult fingers.
• Excitation: Constant-voltage AC excitation (22 mV_rms @75 Hz)
• Current density: ≤0.5 μA cm^–2
• Safety: Approved to IEC601-1 BF (body protection) standard
• Input isolation: Transformer isolation (AC bridge operation)
• Isolation rating: 4000 V AC_rms for 1 minute
• Amplification ranges: 1 to 40 μS full scale in 6 steps (combined PowerLab and GSR Amp)

• Frequency response: –3 dB at 1 Hz
• Accuracy: ±5 %
• Input leakage current: <3 μA_rms at 240V, 50 Hz <2 μA_rms at 120V, 60 Hz
• Zeroing and offset: Automatic software-controlled fast zeroing, controlled by internal 12-bit DAC; resolution = ±0.2 μS

Output

• Analog signal: ±2 V full scale

Control Port

• I²C port: Provides control and power. Interface communications rate of ~50 Kbits/s.

Physical Configuration

• Dimensions (h × w × d): 50 mm × 76 mm × 260 mm (1.96" × 3.0" × 10.2")
• Weight: 750 g (1 lb 10.5 oz)
• Power requirements: 2.5 W maximum
• Operating temperature range: 0 to 35 °C, 0 to 90% humidity (noncondensing)

ADInstruments reserves the right to alter these specifications at any time.