ML317 EOG Pod Operating Instructions

Operating Instructions Connect the 8-pin DIN cable from the EOG Pod to a PowerLab Pod port or a Pod port of a Pod Expander connected to the PowerLab. Do not connect other devices such as Front-ends or Instruments to the corresponding BNC connector on the channel used by the Pod. Pods can be connected to the PowerLab unit while Chart or Scope software is running, but not when recording data. Once detected, the functions of the EOG Pod are combined with those of the PowerLab and software, replacing the Input Amplifier dialog with the EOG Pod (Figure 1). Figure 1

Click this button to open the “Units Conversion” dialog window.

Theory of Operation The EOG Pod is a DC coupled biopotential amplifier with a fixed low-pass filter (500 Hz) to remove high frequencies. On the front of the Pod, an offset knob is provided to remove DC drift. The offset control provides ±15 mV of offset range (at input) for all range selections. The EOG Pod utilizes the steady corneal-retinal potential in the detection of eye movement and position. This steady dipole may be used to measure eye position by placing surface electrodes to the left and right of the eyes (Figure 2). When the gaze is straight ahead, the steady dipole is symmetrically placed between the two electrodes, and the EOG output is approximately zero. When the gaze is shifted to the left, the positive cornea comes closer to the left electrode, which becomes more positive. There is an almost linear relationship between horizontal angle of gaze and EOG output (approximately ±30º of arc). Electrodes can also be placed above and below the eye to record vertical eye movements and using two EOG Pods, simultaneous vertical and horizontal eye movements can be measured (Figure 3).

Stacking and Unstacking Pods Pods stack by clicking into place on top of each other. To separate stacked Pods, push the top Pod towards the back and then pull them apart from the back. See picture on right.

Typical Data Figure 2

Electrodes placed on the left and right side of the eyes. The reference electrode was placed on the back of the neck. The screen capture above shows a recording of horizontal eye movements.

Figure 3

Electrodes were placed on the left and right side of the eyes, as well as above and below the right eye. The screen capture above shows horizontal (Channel 1) and vertical (Channel 2) eye movements using two EOG Pods.

Back Panel Figure 4 Active Pins Ground Pins

Cable to PowerLab

REF GND

WARRANTY: ADInstruments PowerLab Systems, Front-end and Pod Signal Conditioners are warranted against defects in materials and workmanship for a period of 3 years from the date of purchase. Third party products are covered by the manufacturer’s warranty. Warranties are void if the product has been damaged due to negligence. Consumables and electrodes are not covered by a warranty. All questions regarding service and warranty should be directed to your nearest ADInstruments representative or one of the offices listed below.

Caution Read “Statement of Intended Use” on our website or in “Getting Started with PowerLab” before use. Specifications Amplification range: Pod gain: Gain error: Frequency response: Low pass filter: Temperature drift: CMRR: IMRR: Input impedance: Front panel control: Input bias (maximum): Input connector: Cable length: Weight:

±2 mV, ±1 mV, ±500 μV, ±200 μV, ±100 μV ×1000 ±5% untrimmed, ±0.1% when calibrated DC to 500 Hz 500 (fixed) 2nd order Butterworth ±3 mV/°C >80 dB >110 dB <100 MΩ offset knob for initial zeroing of device ±10 nA @ 25 °C 3 shielded lead wire connectors 1.5 m 200 ga

All specifications were tested at the time of printing and are subject to change.

Ordering Information ML317 EOG Pod For use with: MLA1010 Disposable ECG Electrodes Supplied with MLA2503 Shielded Lead Wires (set of three).

ML317-DC-06A

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