• Bipolar amplifier to measure small physiological signals (e.g. ABRs)

  • Connects to actiCHamp (Plus) channel modules

  • Easy setup in the BrainVision Recorder software

  • Comes with electrodes, consumables and accessories

EP-PreAmp: Solution to measure physiological signals like Auditory Brainstem Responses (ABRs) or Nerve Conducting Velocity

The EP-PreAmp is a low-level noise bipolar amplifier to measure extremely small physiological signals, such as Auditory Brainstem Responses (ABRs) or Nerve Conducting Velocity. It can be used in combination with all amplifiers of the actiCHamp family (supports up to 16 EP-PreAmps).

The EP-PreAmp amplifies the signals with low levels of noise, thus improving the signal-to-noise ratio. It enables measurements to be carried out without references and provides low-noise signals over a bandwidth of 0.1 Hz through 3,000 Hz. It has three connections for passive electrodes (minus, plus and ground). The signal from the ground is used as the reference signal for the EP-PreAmp and for the AD converter of the amplifier.

Please note:
→ The EP-PreAmp has a gain factor of 50.

→ Each PreAmp occupies two channels on the actiCHamp (Plus) amplifier.

When and why is the EP-PreAmp needed?

It can be used virtually for any scientific application benefiting from simultaneous measurement of EEG & (up to 16) bipolar signals carried out with a low-level noise pre-amplifier. ExG measurements for applications including EMG and ECG mapping, nerve conductive studies, somatosensory evoked potentials, visual evoked potentials, acoustic brainstem potentials, etc. are just some of the investigations that could be carried out with the EP-PreAmp.

EP-PreAmpTechnical specifications
Max. number of channelsactiCHamp: 16 channels
V-Amp: 2 channels
Channel type / referenceBipolar
actiCHamp reference potential GND 2 V
V-Amp reference potential GND 2.5 V
Common mode input voltage range±1,500 mV or 3,000 mVpp
Differential mode input voltage range±8 mV or ±16 mVpp
Signal coupling
Low-cutoff frequency (high-pass)
Antialiasing low-pass
0.1 Hz first order
EEG channels: 3 kHz second order
Gain factor50
Input impedance> 100 MΩ (for DC)
Inherent noise (incl. electrode noise)< 1 μVpp (over the bandwidth 0.1 to 70 Hz)
< 5 μVpp (over the bandwidth 0.1 to 3 kHz)
Offset voltage< 100 μV (including electrode offset) measured in 0.9% NaCl solution
Common-mode rejection (CMR)> 100 dB
Impedance measurementMeasuring frequency: 30 Hz
Measuring range: 1 kΩ through 500 kΩ
Measuring current: < 7.5 μA
Measuring cycle time: < 4 s
The impedance is displayed using 3 colored LEDs (green, yellow, red) on the EP-PreAmp and possibly in the application software.
Power supply for EP-PreAmpVia 7-way socket of the EP-PreAmp Splitter
EP-PreAmp Gain 50: 6 VDC, power consumption in operation: 5 mA
Power supply for EP-PreAmp SplitterVia multiway connector
- Input 3.3 VDC
- Output 6 VDC, 5 mA per channel
Power consumption in operation- 20 mA at EP-PreAmp Splitter 2 Ch
- 160 mA at EP-PreAmp Splitter 16 Ch
Suitable for use in MR scanner roomNo
Medical deviceNo
CE markingThe Brain Products GmbH confirms the electromagnetic compatibility (EMC) of this product 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 this product 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).

Recommended add-ons

actiCHamp Plus & PowerUnit

actiCHamp Plus

BrainVision Recorder

BrainVision Recorder