BrainAmp ExG

Solution for bipolar and sensor data acquisition

The simultaneous recording of EEG, bipolar as well as peripheral signals opens up new scenarios in the investigation of the mechanisms underlying for example emotional behavior. The BrainAmp ExG amplifier is a bipolar amplifier which can be used to record EMG, ECG, EOG and polygraphic channels such as GSR (Galvanic Skin Response), acceleration, temperature and blood pulse with an extremely compact design.

The BrainAmp ExG amplifier (16ch) is based on the same technology and design as the entire BrainAmp family and is therefore fully compatible with all the other members of this large family. All signals can be recorded with a sampling rate up to 5000 Hz and a broad hardware bandwidth ranging from DC to 1000 Hz. The ExG has been conceived as an extension to all the other BrainAmp amplifiers but it can also be used as a fully independent unit.

The ExG amplifier powered by a rechargeable battery, the PowerPack, and can be connected to a laptop allowing it to be used anywhere and for any type of recording.

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Technical Specifications

BrainAmp ExGTechnical specifications
Amplifier
Number of channels (per unit)16 bipolar
Channel type / reference8 bipolar + 8 AUX by means of ExG AUX Box
Sampling rate5 kHz per channel
Resolution0.1 μV / 0.5 μV per bit (switchable)
Measuring range±3.28 mV / ±16.384 mV (switchable)
BrainAmp ExGTechnical specifications
Amplifier
16 bit TTL (LVTTL) signals, 0 to +5 V (+ 3.3 V), max. 10 mA16 bit TTL (LVTTL) signals, 0 to +5 V (+ 3.3 V), max. 10 mA
Input impedance10 MΩ (for DC)
Filter typeFirst-order filter with 6 dB/octave
Lower cutoff frequency (high pass)0 Hz in DC mode or 0.016 Hz/10 s in AC mode; switchable between AC and DC modes
Filter typeFifth-order Butterworth filter with 30 dB/octave
High-cutoff frequency (low-pass)/time constant1,000 Hz / 250 Hz (switchable for the resolutions 0.1 μV / 0.5 μV per bit)
Input noise≤ 2 μVpp
Common-mode rejection (CMR)≥ 100 dB
Bit width of the A/D converter (EEG and AUX)16 bit
Amplitude accuracy±2%
DC offset tolerance±300 mV
Integrated impedance measurementPresent; measurement includes ground electrode and reference electrode
Signal transmissionOptically coupled using duplex fiber optic cables
Power SupplyPowerPack (external rechargeable battery) or Mains Power Supply for BrainAmp
Power consumption (in operation)Max. 120 mA
Power consumption (in standby)Typically 7 mA
Operating time between chargesTypically 30 hours with one amplifier, 15 hours with two amplifiers
Dimensions (H x W x D)Approx. 68 mm x 160 mm x 187 mm
WeightApprox. 1.1 kg
Unlocking functionPresent
Locking of unused channelsPresent
Suitable for use in MR scanner roomNo

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