Octal Bio Amp

Overview:

The Octal Bio Amp consists of eight electrically isolated differential input AC amplifiers with a shared ground connector and separate inputs. The Octal Bio Amp is recommended for use where multiple biopotentials are being recorded from a single subject rather than "daisy-chaining" multiple Bio Amps.

The Octal Bio Amp is supplied with all necessary connection cables as well as two(2) packets of MLA0310 Lead Wires (1.8 m, 10 snap on). The unit can be used with any EEG cap systems (MLAEC1, MLAEC2) as well as the MLA700 Reusable ECG Electrodes and MLA710 Chest ECG Electrodes.

On the front panel of the Bio Amp each of the eight inputs has one red and one black connector and an indicator (status) light. The green connector is a shared ground connection across all eight inputs. 

The Octal Bio Amp has an audio monitor output on the front panel that can be used with a wide range of headphones or externally powered speakers. The 3.5 mm stereo socket provides two channels of sound, one for each data channel. The audio output may be of use when monitoring nerve firings to control the placement of electrodes, for instance.

Hardware:
ADInstruments signal conditioners only function with PowerLab data acquisition units and therefore are not suitable for use with other data acquisition systems. The Octal Bio Amp can be used with any PowerLab SP or later model.

Features:

• Electrical isolation from power-line (mains) circuitry to ensure subject safety
• Record 8 biopotential inputs from a single subject
• Suitable for human connection
• Software control of gain, filter settings and an adaptive online mains filter
• Seamless integration with PowerLab data acquisition systems
• Displays actual input amplitude (when used with PowerLab & Chart software), No rescaling required

Applications:

The Octal Bio Amp is designed to allow the researcher using a PowerLab system to perform isolated measurements of biological signals — such as ECGs (EKGs), EMGs, and EEGs — from human or animal subjects. Suitable applications include surface EMG from multiple muscles, 12-lead ECG (8 channels plus 4 calculated), 8-channel EEG and event related potentials

Specifications:

Input

• Connection type: 17 x 1.5 mm single pin shrouded male socket
• Input configuration: 8 isolated differential channels with common isolated ground reference
• Input impedance: 200 MΩ differential, 30 pF (no cable) or 200 pF to isolated ground
• Isolation: 4000 V_rms (50 Hz for 1 minute)
• Amplification ranges: ±5 μV to ±100 mV full scale in 14 steps (combined PowerLab and Bio Amp)

• Gain accuracy: ±1.5 % all ranges
• Non-linearity: <0.1 % within range
• Noise at various bandwidths:

• IMRR (isolation mode): >135 dB (to true earth, 50 to 100 Hz)
• CMRR (common mode): 85 dB (typical) @ 60 Hz
• Input leakage current: <3 μA_rms @ 240V, 50 Hz <2 μA_rms @ 120V, 60 Hz
• DC blocking: ±1 V
• Baseline restoration: Automatic or manual

Filtering

• Low-pass filter: Fourth-order Bessel filter, ±3 % accuracy
• Low-pass options: Software selectable. Standard: 50, 100, 200, and 500 Hz and 1 and 5 kHz (at –3 dB); EEG mode: 3, 10, 30, 60 and 120 Hz
• High-pass filter: First-order filter, ±0.25% accuracy
• High-pass options: Software selectable. Standard: 0.02, 0.1, 0.3, 1, 3, and 10 Hz (all at –3 dB); EEG mode: 0.03, 0.1, 0.3 and 1 seconds
• Notch filter: Second-order filter, –32 dB attenuation; 50 or 60 Hz frequency (automatic sensing)

Output

• Signal: ±2.0 V standard
• Audio output: Stereo output supplying signals from both data channels; ± 200 mV full scale, current limited to ±5 mA. Suitable for headphones or powered speakers.

Control Port

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

Physical Configuration

• Dimensions (w × h × d): 300 mm × 76 mm × 300 mm (11.8" × 2.6" × 11.8")
• Weight: 4 kg (9 lb)
• Power requirements: ~10 W
• Operating temperature range: 0 to 35 °C, 0 to 90% humidity (non-condensing)

Safety

• Safety: Approved to IEC60601-1:1988 including A1 & A2 (pending) BF rated (body protection)
• EMC: Approved to IEC60601-1-2:2001 (pending)
• Method of Disposal: Forward to recycling center or return to manufacturer.

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