Multichannel DC EEG MR systems

Multichannel DC EEG MR systems

Multichannel DC EEG MR systems

UNCOMPROMISING DEVICE FOR EEG ACQUISITION

NVX-72/136/272 are designed for a medical-biologic researching in scientific and educational institutions.

Each channel has a direct current input and individual 24-bit analog-to-digital converter for measuring the EEG signal up to 100 thousand times per second.

Possible to extend up to 272/408 channels by connecting two or three amplifiers to the media converter, which gives a single clock frequency for all ADCs and ensuring synchronous channels conversion.

Software for planning of experiment and recording signals to EDF+ 16bit, BDF+ 24bit, GDF 32bit.

Set NVX-272 include:

  • NVX-136 DC EEG system base - 2 pcs
  • Electrode cap MCScap PROFESSIONAL MR 256, size L 54-60 cm

NVX-136 DC EEG system base include:

  • NVX136 DC EEG amplifier
  • NVX136 media converter
  • NVX136 battery module
  • NVX136 charger
  • optical cable 1 m
  • optical cable 10 m
  • NVX136 transport suitcase

SPECIFICATION of NVX-136

DC channels number

136/272/408

Dynamic range

not less ±400 mV

Input resistance / capacity

more 1 GOhm @ DC / 30pF max

Input EEG channels noise

less 0.9 uVp-p @ 0,1..30 Hz

Voltage measuring error

not worse ±0.5%

DC channels number, connected via AUX

8 monopolar (4 connectors x 2 channels)
or 4 difierencial (4 connectors x 1 channels)
set by application SW

Additional dynamic range for channels,
connected via AUX

not less ±2000 mV, set by application SW

Analogy-to-digital conversion

24 bit, 6th order delta-sigma modulator with 64x oversampling,
one converter per each channel

Sampling rate of amplifier
(high cutoff frequency at -3dB)

For 64 EEG channels 100 000 Hz (16 000 Hz)
For all channels: 50 000 Hz (16 000 Hz), 25 000 Hz (9 000 Hz),
10 000 Hz (4 900 Hz), 5 000 Hz (1 600 Hz), 2 000 Hz (650Hz),
1 000 Hz (300 Hz), 500 Hz (160 Hz), 250 Hz (180 Hz)

Low frequency range at -3dB,
created by application SW

set individually for each channel from a range of 0..100Hz
or selected from the series 0, 0.001, 0.05, 0.1, 0.5, 1, 2, 5, 10 Hz

Low frequency range at -3dB,
created by application SW

set individually for each channel from a range 5000..1 Hz
or selected from the series 500, 300, 100, 70, 50, 30, 20, 10, 5, 1 Hz

TTL triggers input / output

8 / 8, not galvanic isolated from PC

Electrode impedance measurement range (absolute error)

1..120 kOhm (±10%), at 30 Hz

Test EEG signal

square wave 200 uV (±1%), 1 Hz

Input for external synchronization of ADCs

5..100 MHz, 50 Ohm sin / square wave

Aux sensor powering

5V, up to 100 mA for all sensors with electronic protection

Connecting amplifier – media converter

Optical plastic cable 10 m (option 15 m)

Connecting media converter – PC

USB V2.0 High-speed 480 MBod

Powering of amplifier

from accumulator module 6 V, 7 A·h; current consumption:
less 1400 mA for sampling rates of 25 000..100 000Hz,
less 500 mA for another sampling rates,
less 3 mA in standby mode

Powering of media converter

from USB 5 V; less 400 mA in active mode,
less 5 mA in standby mode

Sizes and weight of amplifier

195x140x35 mm, 1200 gr

Sizes and weight of accumulator module

195x140x48 mm, 2500 gr

Sizes and weight of media converter

90x112x58 mm, 300 gr