BrainAmp series

High-end amplifier solutions for laboratory EEG recordings
Up to 256 channels: Stackable 32 channel units

Expandable with the BrainAmp ExG for bipolar and sensor data acquisition
Full compatibility with all our active and passive electrode systems

More details

BrainAmp: High quality solutions for neurophysiology recordings

Proven technical features (BrainAmp DC)

- Sampling rate: 5 kHz per channel
- Input noise: ≤ 1 μVpp
- Common-mode rejection (CMR): ≥ 110 dB
- Triggering: 16 bit TTL trigger input to detect markers from visual, accoustic, electrical, magnetic or other stimulation modalities

Powered by lead gel technology (the PowerPack)

- Fully eliminates 50/60 Hz mains noise originating from power supplies, ensuring highest quality EEG/ERP recordings
- Can be used for continuous acquisitions of up to 30 hours and allows for more than 1000 recharging cycles
- Labeled “MR conditional” and therefore suitable for safe EEG recordings in the MR scanner

Flexibility

- Several 32 channel units can be stacked to expand the number of channels up to 256
- Can be used in combination with easy to prepare active electrodes (actiCAP slim/snap*) for best data quality as well as gel-based passive electrodes (BrainCap)
- Also compatible with passive sponge-based electrodes (R-Net) or active dry electrodes (actiCAP Xpress Twist*) when quick preparation times are crucial
- Can be powered via battery (PowerPack) or Mains Power Supply

Expandability

The EEG amplifier systems can be combined with the BrainAmp ExG to add the capability to record bipolar and peripheral signals, such as EOG, ECG, EMG, GSR/EDA, Respiration, Acceleration, etc.) in an extremely compact setup.

Integrated for multimodal recordings

- Reliable solution for EEG-TMS co-registrations (BrainAmp DC and BrainAmp MR plus)
- Dedicated versions for use in the MR environment available

* Adapter/control box may be required for this combination.

Available amplifier options

BrainAmp Standard

- Only offers AC recording mode
- Comes with amplifier, battery (PowerPack), USB2 Adapter/BUA (connection to computer), electrode input box (EIB), Signaltester, all required cabling and a time-limited trial version of all our software solutions for signal recording and analysis

BrainAmp DC

- Includes all features of the BrainAmp Standard with the addition of a DC recording mode and multiple hardware filtering options. The amplifier setup is fully controllable via the recording software. It is also possible to switch from DC to AC recording mode as well as to select different hardware bandwidths with just one “click” in the software.
- Comes with amplifier, battery (PowerPack), USB2 Adapter/BUA (connection to computer), electrode input box (EIB), Signaltester, all required cabling and a time-limited trial version of all our software solutions for signal recording and analysis

BrainAmp ExG

- Bipolar 16 channel amplifier to record EOG, ECG, EMG and other peripheral signals such as GSR (Galvanic Skin Response), respiration, acceleration, etc. in the lab environment
- Based on the same technology as BrainAmp Standard and DC
- Available as an extension or stand-alone system
- Comes with amplifier, battery (PowerPack), USB2 Adapter/BUA (connection to computer), AUX box (connection of sensors), Signaltester and all required cabling

Technical specifications

BrainAmp series	Technical specifications
Amplifier	BrainAmp Standard	BrainAmp DC	BrainAmp ExG
Number of channels (per unit)	32	32	16 bipolar
Channel type / reference	Referential channels/acquisition of a reference using a single electrode (unipolar)	Referential channels/acquisition of a reference using a single electrode (unipolar)	8 bipolar + 8 AUX by means of ExG AUX Box
Input impedance	10 MΩ (for DC)	Switchable: 10 MΩ / 10 GΩ (for DC)	10 MΩ (for DC)
Input noise	≤ 2 μVpp	≤ 1 μVpp	≤ 2 μVpp
Common-mode rejection (CMR)	≥ 90 dB	≥ 110 dB	≥ 100 dB
Lower cutoff frequency (high pass)	0.016 Hz/10 s	0 Hz in DC mode or 0.016 Hz/10 s in AC mode; switchable between AC and DC modes	0 Hz in DC mode or 0.016 Hz/10 s in AC mode; switchable between AC and DC modes
Filter type	First-order filter with 6 dB/octave	First-order filter with 6 dB/octave	First-order filter with 6 dB/octave
High-cutoff frequency (low-pass)/time constant	1,000 Hz	1,000 Hz / 250 Hz (switchable for the resolutions 0.1 μV / 0.5 μV per bit)	1,000 Hz / 250 Hz (switchable for the resolutions 0.1 μV / 0.5 μV per bit)
Filter type	Fifth-order Butterworth filter with 30 dB/octave	Fifth-order Butterworth filter with 30 dB/octave	Fifth-order Butterworth filter with 30 dB/octave
Measuring range	±3.28 mV	±3.28 mV / ±16.384 mV (switchable)	±3.28 mV / ±16.384 mV (switchable)
Resolution	0.1 μV per bit	0.1 μV / 0.5 μV per bit (switchable)	0.1 μV / 0.5 μV per bit (switchable)
Power Supply	PowerPack (external rechargeable battery) or Mains Power Supply for BrainAmp	PowerPack (external rechargeable battery) or Mains Power Supply for BrainAmp	PowerPack (external rechargeable battery) or Mains Power Supply for BrainAmp
Power consumption (in operation)	Max. 110 mA	Max. 130 mA	Max. 120 mA
Power consumption (in standby)	Typically 7 mA	Typically 7 mA	Typically 7 mA
Amplitude accuracy	±2%	±2%	±2%
Bit width of the A/D converter (EEG and AUX)	16 bit	16 bit	16 bit
Sampling rate	5 kHz per channel	5 kHz per channel	5 kHz per channel
DC offset tolerance	±300 mV	±300 mV	±300 mV
Signal transmission	Optically coupled using duplex fiber optic cables	Optically coupled using duplex fiber optic cables	Optically coupled using duplex fiber optic cables
Operating time between charges	Typically 30 hours with one amplifier, 15 hours with two amplifiers	Typically 30 hours with one amplifier, 15 hours with two amplifiers	Typically 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	Approx. 68 mm x 160 mm x 187 mm	Approx. 68 mm x 160 mm x 187 mm
Weight	Approx. 1.1 kg	Approx. 1.1 kg	Approx. 1.1 kg
Integrated impedance measurement	Present; measurement includes ground electrode and reference electrode	Present; measurement includes ground electrode and reference electrode	Present; measurement includes ground electrode and reference electrode
Unlocking function	Present	Present	Present
Locking of unused channels	Present	Present	Present
Suitable for use in MR scanner room	No	No	No

Battery	Technical specifications
PowerPack
Number of amplifiers supplied	1 or 2
Charging voltage	9 V DC
Charging current	670 mA
Rated capacity	6,500 mAh
Output voltage	5.6 V DC
Output current	300 mA
Total Operating time	Approx. 4,000 hours
Charging	Using external charger (Charger V9); only outside the scanner room
Charging time	Approx. 17 hours (with empty battery at room temperature)
Rechargeable battery type	Lead gel rechargeable battery
Dimensions (H x W x D)	Approx. 68 mm x 160 mm x 187 mm
Weight	Approx. 1.9 kg
Electrical protection class	II
Suitable for use in MR scanner room	Yes
PowerPack charger V9
Input voltage range	100 to 240 V AC, 50/60 Hz
Rated power consumption	Max. 145 mA
Output voltage	9 V DC
Output current	Max. 670 mA
Suitable for use in MR scanner room	No
Weight	Approx. 130 g (without power adapter)

Miscellaneous	Applicable to all of the above
Medical devices	No
CE markings	The Brain Products GmbH confirms the electromagnetic compatibility (EMC) of these products according to the Directive 2014/30/ EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility. The Brain Products GmbH confirms the RoHS compliance of these products according to Directive 2011/65/EU of the European Parliament and the Council of 8 June 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment (recast published in the Official Journal of the European Union on 1 July 2011) as well as all its amendments up to and including the Commission delegated directive (EU) 2015/863 of 31 March 2015 (published in the Official Journal of the European Union on 4 June 2015).

Miscellaneous

Applicable to all of the above

Medical devices

CE markings

The Brain Products GmbH confirms the electromagnetic compatibility (EMC) of these products according to the Directive 2014/30/ EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility.

The Brain Products GmbH confirms the RoHS compliance of these products according to Directive 2011/65/EU of the European Parliament and the Council of 8 June 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment (recast published in the Official Journal of the European Union on 1 July 2011) as well as all its amendments up to and including the Commission delegated directive (EU) 2015/863 of 31 March 2015 (published in the Official Journal of the European Union on 4 June 2015).