BMA-400 Four-channel AC/DC Preamplifier

• 4-channel AC/DC amplifier for all extracellular recording
• Low-noise, wide gain range
• Multi-channel EEG, EMG, ECG recording
• True DC response with adjustable offset
• Stimulus passing to electrodes
• Isolation head-stage (ISO-Z) and high impedance head-stage (HS-1) are available

Input type: Differential
Input range for full-scale output: +100mV - 0.5V 
Input impedance: >1000 Megohm
Noise, referred to input: <5mV P-P, wideband
Common Mode Rejection: >95dB
Gain range: 10X - 50,000X, 12-positions 
Low-pass filter: 100Hz - 50kHz, 6-positions
High-pass filter: DC - 100Hz, 6-positions
Filter type, slope: Butterworth, flattest response, -12dB/octave
Stim/record input: TTL
Input connections (rear panel): Amphenol 703-91T-3478-009 7-pin 
Output connections (rear panel): BNC jack
Data port connector (rear panel): 25-pin D-SUB female
Power requirements: 115/230VAC, 10VA 
Dimensions: 12W x 4H x 9D inches, 30 x 10 x 23 cm

Note 1: Not to be used for human life support applications.

The BMA-400 Bioamplifier is a low-noise, four-channel instrument for amplifying EEG, ECG, EMG, and other extracellular biopotential signals. It features low noise, a wide gain range, and sharp cutoff bandpass filters. It can be used as a stable DC amplifier, and includes adjustable DC input offset controls.

Logic inputs control stimulus passing through the recording electrodes. This stim/record inputs, as well as the four channel outputs, are connected to a multi-pin connector on the rear panel for convenient cable connections. Four standard input cables are provided, and a range of electrode lead-wires are available (needle, snap, etc.). Unwired input plugs are available for fully custom electrode configurations.

Applications for the BMA-400 Bioamplifier include multi-channel EEG, EMG, and other extracellular biopotential measurements. Head-stages are available for high-impedance electrodes or custom recording applications, including the ISO-Z isolated head-stage.