Dual Bio Amp/Stimulator

Overview:

The Dual Bio Amp/Stimulator is an integrated unit, consisting of two fully isolated differential amplifiers with an isolated stimulator suitable for use with humans. The Dual Bio Amp features are optimized to measure a wide variety of biological signals and can record EEG, ECG, and EMG. In conjunction with a PowerLab and LabChart, Chart, Scope or LabTutor software a wide range of appropriate filters are available. The isolated stimulator is electronically isolated from both ground and the dual bio amplifier. The unit features an audio output jack for headphones or powered speakers. Supplied with a MLA2540 5 Lead Shielded Bio Amp Cable and MLA2505 Shielded Lead Wires (5 snap-on). The stimulator is designed for human experiments with the output limited in current, duration, and repetition rate to minimize risk from inadvertent settings.  The Bio Amp is certified and approved for human connection.

The following are some accessories suitable for use with the Dual Bio Amp/Stimulator:
MLA700 Reusable ECG Electrodes
MLA710 Chest ECG Electrodes
MLAWBT9 EEG Flat Electrodes
MLA0112/D ECG Lead Switch Box
MLADDF30 Stimulating Bar Electrode

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

Features:

Applications:

This Bio Amp can be used for recording EEG, ECG, EMG, EOG, ERG, sensory nerve action potentials (SNAP), visual evoked response (VER), cortical evoked potentials, and slow wave (smooth muscle) studies. Studies requiring bilateral measurements and integrated stimulation are particularly appropriate such as conductivity nerve conduction studies.

Specifications:

Dual Bio Amp Input

• Connection type: Six-pin DIN/MS socket to fit 5-Lead Bio Amp Cable (Tronomed D-1540)
• Input configuration: 2 differential channels with common isolated ground reference
• Input impedance: 100 MΩ to ground (~200 pF per lead) using supplied Bio Amp cable and leads
• Safety: Approved to IEC601-1 BF (body protection) standard
• Isolation rating: 4000 V AC_rms for 1 minute
• Amplification ranges: ±20 μV to ±50 mV full scale in 11 steps (combined Bio Amp and PowerLab)

• Gain accuracy: ±1 % all ranges
• Non-linearity: <1 % of full scale (better for ranges under 1 mV)
• Notch-filtering: 50 or 60 Hz notch filter, automatically selected to match supply frequency
• High-pass filtering: Single-pole 0.1, 0.3, 1, and 10 Hz (–3 dB) with accuracy of ±10 %. The high-pass filters are phase-matched to within 1° phase shift at the –3 dB frequency to allow for accurate waveform arithmetic.
• Low-pass filtering: 8th-order Bessel-type filters (linear time delay).
• Frequencies software-selectable at 20, 50, 100, 200, and 500 Hz, and 1000, 2000, and 5000 Hz. Frequency accuracy is ±2%.
• DC blocking: ±0.5 V
• Baseline restoration: Automatic
• Noise levels: 0.1 Hz to 5 kHz 1.95 μV

• IMRR (isolation mode): >130 dB (@ 50 to 100 Hz)
• CMRR (common mode): >75 dB (DC to 100 Hz) >60 dB (@ 1 kHz)
• Input leakage current: <6 μA_rms @ 240 V, 50 Hz <4 μA_rms @ 120 V, 60 Hz
• Audio output: Stereo output supplying signals from both Bio Amp channels. Suitable for earphones, headphones, or most externally powered speakers. Output is a 100 mV signal for any full-scale signal. Current limited to ±5 mA.

Isolated Stimulator Output

• Output configuration: Constant-current stimulator with hardware limited repetition rate
• Isolation rating: 4000 V_rms to ground as per IEC601-1 2000 V_rms (60 seconds) to Bio Amp inputs
• Pulse duration: 50 to 200 μs (software-selectable)
• Compliance voltage: 100 to 110 V typical
• Output current: 0 to 20 mA in 0.1 mA steps (software selectable)
• Pulse rate: Software-selectable, but hardware-limited to a maximum of 20 Hz for safety
• Safety indicators: A single multi-colour indicator displays the isolated stimulator status. A green flash indicates delivery of a valid stimulus. A yellow flash indicates an out-of-compliance condition.
• Safety switch: Isolating on-off switch flicks down to disconnect quickly

Control Port

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

Physical Configuration

• Dimensions (w × h × d): 200 × 65 × 250 mm (7.9" × 2.6" × 9.8")
• Weight: 1.52 kg (3 lb 5oz)
• Power requirements: ~6 W
• Operating temperature range: 0 to 35 °C, 0 to 90% humidity (non-condensing)

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