OVERVIEW
Research system for DC EEG acquisition and transcranial electrical stimulation (tDCs/tACs/tRNS)
NVX-36T amplifier is used in training systems, clinical and scientific researches as a part of computer-based system. Each channel has a DIRECT CURRENT input cascade and individual 24-bit ADC for EEG sampling up to 10000 times per second.
Internal high resolution Direct Digital Synthesis (DDS) current stimulator for producing DC or AC current via any EEG electrode or a set of electrodes.
Application software for settings of experiment, recording to EDF+, BDF+ and stimulation. Software library for self-design of user application.
• 32 EEG DC monopolar channels, 4 DC AUX bipolar channels for probes, 9/1 input/output triggers, OLED display, AC/DC DDS current generator. Stimulate using up to 31 electrodes.
• Dual use electrodes for EEG acquisition and stimulation. Used big-area sintered Ag/AgCl electrodes and innovative textile cap.
SOFTWARE
EEG amplifier NVX supports research software NeoRec and clinical software NEUROvisor.
Tetos expert software
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, OpenViBE etc.
SDK for software development for PC and mobile applications is provided by the manufacturer upon request.
NEUROvisor is a clinical EEG software which available at PC and as mobile application.
Software NEUROvisor is a friendly one button solution, which provides standard montages and examination scenarios according to IFCN guidelines, automatic or semi-automatic examination procedure with voice prompts, automatic artifact rejection using ICA method, automatic generation of reports with manual editing capability.
Quantitative EEG presented by amplitude-frequency analysis of the main EEG rhythms, spectral analysis (charts and maps), independent component analysis.
*Оption
SPECIFICATION
| EEG recording mode | |
| EEG channels | 32 |
| Channels of sensors | 4 galvanic isolated from EEG |
| Synchronization channels | 9 / 1 |
| Display | OLED 3.2", 256 x 64 px |
| Input dinamic range of EEG cannels | not less then ± 400 mV |
| Input impedance of EEG cannels | > 100 MOhm @ DC |
| Noise of EEG cannels | < 1 µV pk-pk (0.17 RMS) @ 0.1‑30 Hz |
| Electrode impedance measurement range | 1‑120 kOm (±10%) @ 30 Hz |
| EEG test signal | square 250 µV (±1%), 1 Hz |
| Input dinamic range of sensor channels | 0‑4 V |
| Input impedance of sensor channels | more 20 MOhm @ DC |
| Noise of sensor channels | < 15 µV pk‑pk (2.5 µV RMS) @ 0.5‑30 Hz |
| Powering of sensors | +5 V, 15 mA per channel with electronic protection |
| Digitalization | 24 bit, 6th order delta-sigma modulator with 64x oversampling, one converter per each channel |
| Low pass filter | From 0 Hz (DC) followed by filtering by application software |
| Sampling rate | 500, 1000, 2000 Hz (TETOS Expert); 250, 500, 1000, 2000, 5000, 10000 Hz (NeoRec); 250‑2000 Hz for all channels: 5000 Hz for the first 24 channels; 10000 Hz for the first 16 channels; |
| Data transfer format in real time | Lab Steaming Layer (LSL) |
| Input TTL levels of synchronization channels | Low Uil <+0.8 V, Iil > -2.1 mA High Uih > +3.5 V, Iih > -0.1 mA |
| Output TTL levels of synchronization channels | Installed programmatically by a command from the PC. Low Uol < +0.4 V, Iol > -1.6 mA High Uoh > +2.8 V, Ioh > 0.5 mA |
| Synchronization channel mode | synchronously with the issued channel readings, accuracy ±0.5 reading. |
| Galvanic isolation | reinforced |
| Stimulation mode | |
| Number of current generators | 1 |
| Number of stimulation channels | up to 31 (30 ЭЭГ + GND, switching to channels A1 and A2 is not available) Each electrode can be connected to the anode or cathode of the generator |
| Current generator | 16 bit Direct Digital Synthesis (DDS) |
| Stimulating current range | from 10 µA to 3.9 mA |
| Maximum output voltage of the current generator | 30 V |
| Stimulation current modes | Direct current (tDCS), Alternating current (tACS), Alternating current monopolar (tACMS), Random noise (tRNS), Custom stimulation mode |
| Stage duration | up to 60 min |
| Smooth start/end of stimulation | Off, 10 sec, 20 sec, 30 sec |
| Sham | Off, 10 / 20 / 30 sec. at the beginning, 10 / 20 / 30 sec. at the beginning and at the end |
| Stimulus shapes in tACs and tACMs mode | Sine, square, random noise, ramp, trap, sinc, Gauss, Lorentz, haversine, exponential, custom |
| Loading an external stimulus | from a specially prepared WAV file |
| Current generator sampling rate | 8000 Hz |
| Maximum frequency for a periodic signal | 1000 Hz |
| tRNS frequency band selection | Lower cutoff frequency at -3 dB: 0, 10, 50, 100, 200, 300, 500, 1000 Hz; Upper cutoff frequency at -3 dB: 50, 100, 200, 300, 500, 1000, 2000 Hz; |
| Measurements during stimulation | total generator current; total load impedance; Local current for each electrode (for all electrodes in AC mode, for the anode in DC mode) |
| Stimulation indication | In the program, sound signal, indicator light, output trigger, on the LED screen of the device |
| Other | |
| Dimensions (LxWxH) | 200 х 155 х 40 mm |
| Net weight | < 650 g |
| Safety | IEC60601‑1, IEC60601‑1‑6, IEC60601‑2‑10, IEC60601‑2‑26 class II, type BF |
ACCESSORIES
NVX 36T Electrode kit includes
Ag/AgCl sintered electrodes MCScap-NTC – 33 pcs.
• Ag/AgCl electrodes MCScap-CS22 – 33 pcs.
• stainless steel electrodes MCScap-CS22SS – 33 pcs.
• set of ear Ag/AgCl sintered electrodes with fixators – 2 pcs.
• textile cap MCScap 10-10, size L (54-60 cm) – 2 pcs.
• textile cap MCScap 10-10, size M (48-54 cm) – 2 pcs.
• textile cap MCScap 10-10, size S (42-48 cm) – 2 pcs.
• elastic textile belt, size L (54-60 cm) – 2 pcs.
• elastic textile belt, size S (42-48 cm) – 2 pcs.
• starter kit (conductive gel, syringe, needles, brushes for cleaning).
PHOTO
