OVERVIEW
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 channels by connecting two 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.
SOFTWARE
EEG amplifier NVX – 72 / 136 / 272 supports software NeoRec.
NeoRec is a PC software designed for experiment plannig and for recording EEG and other biomedical signals during scientific or medical research, include Evoked Potentials preprocessing.
Record files can be saved in different formats (EDF+ 16 bit, BDF+ 24 bit, GDF 32 bit) or transmited online via stream LSL (Lab Streaming Layer) for analyze by third party software as MATLAB / EEGLAB, OpenViBEetc.
SDK for software development for PC and mobile applications is provided by the manufacturer upon request.
SPECIFICATION
| Parameter | Value |
| EEG amplifier | |
| EEG channels | 128 |
| Channels of sensors | 8 monopolar (4 connectors x 2 channels) or 4 bipolar (4 connectors x 1 channels) set by applied software |
| Display | none |
| Expansion of channels number | up to 408 channels by connecting one or two additional amplifiers to the media converter |
| Input dinamic range of EEG cannels | not less then ± 400 mV |
| Input impedance | more than 1 GOM (with shunting capacity not more than 30 pF) |
| Relative voltage measurement deviation | less ±1% |
| Input dinamic range of sensor channels | not less ±2000 mV set by applied software |
| Noise of EEG cannels | less than 0.9 µV peak-to-peak in the frequency range from 0.1 to 30 Hz |
| Nonlinearity frequency response of the amplifier | from -10% to + 5% (in the frequency range from 0.5 Hz to 100 Hz) |
| Digitalization | 24 bit, 6th order delta-sigma modulator with 64x oversampling, one converter per each channel |
| Sampling rate (with the corresponding upper frequency at -3 dB) | 100 kHz (@16 kHz) (only for 64 EEG channels), 50 kHz (@16 kHz), 25 kHz (9 kHz), 10 kHz (4.9 kHz), 5 kHz (1.6 kHz), 2 kHz (650 Hz), 1000 Hz (300 Hz), 500 Hz (160 Hz), 250 Hz (80 Hz) |
| Lower cutoff frequency at -3 dB | 0..100 Hz or selected from the series 0, 0.001, 0.05, 0.1, 0.5, 1, 2, 5, 10 Hz set by applied software set individually for each channel |
| Upper cutoff frequency at -3 dB | 5000..1 Hz or selected from the series 500, 300, 100, 70, 50, 30, 20, 10, 5, 1 Hz set by applied software set individually for each channel |
| Electrode impedance measurement range | 1–120 kOhm (±10%) @ 30 Hz |
| Amplifier power | From battery module 6 V, 8 A H |
| Consumption current of amplifier | no more than 1400 mA with a data output frequency of 25 000 ... 100 000 Hz; no more than 500 mA with other frequencies of data output; less than 3mA in standby |
| Operating time from fully charged battery module | not less than 4 hours in the modes 25, 50, 100 kHz and not less than 16 hours in the mode 10 kHz |
| Battery charging time | no more than 5 hours |
| Operating time at indication of the battery status as discharged | at least 30 minutes at +25°C |
| Mode indication | Mode indicator |
| Type of common connector for EEG cap | KEL40M (KEL 8825E‑040) |
| Powering of sensors | from amplifier, 5 VDC (±5%) up to 15 mA per probe with electronic protection, but not more than 100 mA in total for 4 channels |
| MediaConverter | |
| Synchronization channels | 8 / 8 not galvanically isolated from the PC |
| Type of connector for input/output trigger channels | DB‑9M / DB‑9F. |
| Input TTL levels of synchronization channels | low level Uil > +0.8 V, Iil > -2.1 mA high level Uih > +3.5 V, Iih > -0.1 mA |
| Output TTL levels of synchronization channels | low level Uol < +0.4 V, Iol < -1.6 mA high level Uoh > +2.8 V, Ioh > 0.5 mA Installed programmatically by a command from the PC. By default, output trigger channels are High. |
| Synchronization channel mode | synchronously with the issued channel readings, accuracy ±0.5 reading. |
| Media converter input for external clock synchronization of the ADC amplifiers | BNC connector characteristic impedance is 50 Ohms, sine / square wave sync signal from 10 to 30 MHz |
| Control and power of mediaconverter | from PC via USB 2.0, 3.0 type B interface |
| Supply voltage of mediaconverter | USB +5 V; |
| Consumption current of mediaconverter | up to 400 mA in active mode, less than 3mA in standby |
| Сable length | 3 m |
| Mode indication of mediaconverter | Mode indicator |
| General | |
| Safety | IEC 60601-1:2005 (ed3.1), IEC 60601-2-26:2012 (ed3.0), IEC 60601-1-2:2014 (ed4.0) |
| Ingress Protection | IPX0 |
| Степень потенциального риска применения | class 2a |
| Mean useful life | at least 5 years, if average time of the use does not exceed 80 hours per month |
| Software technical support | during the specified product life |
| Operating conditions* | +0 ... +40°C, relative humidity from 40 to 80% |
| Storage conditions* | +5 ... +40°C, relative humidity to 80% |
| Transportation conditions* | -50 ... +50°C, relative humidity to 90% without condensation |
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