Wired EOG amplifier (BIOPAC EOG100D)

Name: Wired EOG amplifier (BIOPAC EOG100D)
SKU: 18548

A wired electrooculogram (EOG) amplifier from the BIOPAC Smart Amplifier series — measurement electronics at the electrode reduce EMI and motion artifacts, and acquisition parameters configure automatically in AcqKnowledge. Requires the AMI100D interface and an MP160 or MP200 unit (not MP150), plus AcqKnowledge 5.0.4 or newer.

BIOPAC Smart Amplifier · EOG Measurement (electrooculography)

The EOG100D is an amplifier from the Smart Amplifier series for electrooculogram (EOG) measurement — the measurement electronics sit directly at the electrode, rather than in a module by the acquisition unit.

Because the converter is located so close to the source, the signal is less susceptible to electromagnetic interference (EMI) and motion artifacts, and acquisition parameters configure automatically in AcqKnowledge once the module is connected.

Part of a larger system

Family of BIOPAC Smart Amplifier 100D modules — reference photo of the whole line (EOG100D is one of the modules in this family)

Reference photo of the whole Smart Amplifier 100D family — the EOG100D module has an identical housing.

EOG100D is an expansion module, not a standalone system

The EOG100D module by itself does not record or store data. It requires connection via the AMI100D interface to an MP160 or MP200 data acquisition unit (Smart Amplifier modules do NOT work with the MP150), together with AcqKnowledge version 5.0.4 or newer.

Measurement also requires a universal biopotential lead BN-EL*-LEAD2/LEAD3 — the same one used by the other biopotential modules in this series (ECG100D, EMG100D). There is no dedicated EOG lead — see the section below for details.

Required electrode lead

EOG100D is the amplifier alone — measurement requires a separately ordered electrode lead and electrodes. Unlike some other modules in this series, EOG100D has no dedicated EOG lead — it uses the same universal biopotential lead as the other biopotential modules (ECG100D, EMG100D).

Universal BN-EL biopotential lead with a 100D module

Manufacturer photo (BIOPAC) — BN-EL-LEAD2 biopotential lead, shared across ECG/EMG/EOG/EGG/EEG. BN-EL*-LEAD2 / BN-EL*-LEAD3

Universal biopotential lead

The same general-purpose electrode lead used by the ECG100D and EMG100D modules — there is no separate, dedicated EOG lead. Used with standard Ag/AgCl biopotential electrodes.

Shared across the entire 100D biopotential module family (ECG, EMG, EOG)
Electrodes: standard Ag/AgCl biopotential electrodes
No dedicated EOG lead SKU — a confirmed fact, not an information gap

Key features

Electronics close to the electrode

The Smart Amplifier architecture places the amplifier right at the electrode — significantly reducing EMI interference and motion artifacts compared with a traditional module located at the acquisition unit.

Automatic configuration

Once connected, the module automatically configures acquisition parameters in AcqKnowledge — no manual switch settings required.

EOG derivative mode (velocity)

AcqKnowledge can compute a derivative-of-EOG (velocity) signal using an IIR bandpass filter with a 30 Hz center frequency and Q=0.8 — supporting automatic saccade and nystagmus detection, implementing in software the concept known from the older EOG100C module's "Derivative of EOG" mode.

Ag/AgCl electrodes only

Do not use gold-plated contact electrodes — their high input impedance causes charge build-up and distorts the EOG signal.

×2000gain

0.1 µV rmsintrinsic noise (0.05–35 Hz)

0.05–150 Hzmeasurement bandwidth

MP160/200compatibility (via AMI100D)

Full technical specification

Signal: Electrooculogram (EOG)
Gain: ×2000
Intrinsic noise: 0.1 µV rms (measured over the 0.05–35 Hz band)
Bandwidth (wideband): 0.05 – 150 Hz
EOG derivative mode: Derivative (velocity) signal computed with an IIR bandpass filter — 30 Hz center frequency, Q=0.8 — for automatic saccade and nystagmus detection
Required lead: BN-EL*-LEAD2/LEAD3 — universal biopotential lead, shared with ECG100D and EMG100D (no dedicated EOG lead)
Module dimensions / weight: Approx. 1.8×4.6×1.1 cm, approx. 48 g (amplifier alone approx. 9 g)
Cable: 3 m, RJ12, to the AMI100D interface
Electrodes: Ag/AgCl only — gold-plated electrodes cause charge build-up and distort the signal
Compatibility: MP160 or MP200 (via the AMI100D interface) + AcqKnowledge 5.0.4 or newer

Where to place the electrodes

Click the points on the silhouette to see the approximate EOG electrode layout together with the ground electrode.

Active electrodes: approximate, generally accepted physiological standard (around the outer corners of the eyes for horizontal movement) — not explicitly confirmed in BIOPAC materials for this model. A ground (GND) electrode is typically required in biopotential measurements of this kind — for the EOG100D module itself this has not been explicitly confirmed in the available source materials; the exact position shown is approximate.

General body silhouette — front view, approximate EOG and ground electrode layout

How it works

Electrodes on the subject

Ag/AgCl electrodes placed around the eyes, connected via the universal biopotential lead BN-EL*-LEAD2/LEAD3 to the EOG100D module.

EOG100D + AMI100D + MP160/200

The module amplifies the signal right at the electrode and sends it over an RJ12 cable to the AMI100D interface, and from there to the acquisition unit.

Analysis in AcqKnowledge

Recording of the raw EOG signal or the derivative (velocity) mode supporting automatic saccade and nystagmus detection.

Experimental applications

EOG measurement supports research into eye movements, sleep stages, and gaze-controlled interfaces.

Saccade research

Recording fast eye movements (saccades) in perceptual and cognitive experiments.

Sleep research / polysomnography

Detecting REM sleep based on characteristic eye movements during sleep.

Brain-computer interfaces (BCI)

Using the EOG signal as a control channel in brain-computer interface research.

Visual attention research

Analyzing eye movements as an indicator of the direction and dynamics of visual attention.

Frequently asked questions

How does EOG100D differ from the classic EOG100C module?

Is there a dedicated lead for EOG?

Which acquisition systems does EOG100D work with?

Download materials click to expand

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Wired EOG amplifier (BIOPAC EOG100D)

Part of a larger system

EOG100D is an expansion module, not a standalone system