OVERVIEW
NVX-36T combines the functions of a high-precision 36-channel electroencephalograph and a transcranial electrical stimulator.
Each channel is equipped with an individual 24-bit ADC with a sampling rate of up to 10,000 Hz, providing high quality and accuracy of EEG recording. The built-in current generator, based on direct digital synthesis (DDS), supports various stimulation modes (tDCS, tACS, tRNS, sham, etc.) and allows the use of both standard waveforms and custom sequences.
Key features:
- 32 monopolar EEG channels and 4 additional bipolar channels;
- EEG recording and stimulation with fast alternating mode switching;
- current range 10 µA – 3.9 mA;
- automatic calculation of the integral charge (coulombs) delivered through each electrode;
- OLED display, trigger inputs/outputs, and Lab Streaming Layer (LSL) support for real-time EEG data streaming.
SOFTWARE
For managing transcranial electrical stimulation (tES) and EEG recording, the NeoRec and TETOS Expert software solutions are provided.
- NeoRec — designed for EEG recording and analysis. Supports saving in EDF+, BDF+, and GDF formats, as well as real-time data streaming via Lab Streaming Layer (LSL) for integration with MATLAB, EEGLAB, OpenViBE, and other platforms.
- TETOS Expert — used for configuring and controlling stimulation. Allows setting parameters for tDCS, tACS, and tRNS, using custom waveforms (WAV), flexible electrode role assignment, and real-time monitoring of procedures.
Optional modules (upon request):
- Neurovisor — clinical EEG software with IFCN-recommended montages, voice guidance, built-in artifact suppression algorithms, and automated reporting.
- Neurovisor-tES — clinical module for tES: electrode montage selection, monitoring of current and impedance, and automated stimulation reports.
Together, these software tools provide researchers and clinicians with a precise and flexible environment for managing stimulation parameters and EEG recording, ensuring full control over experimental and clinical procedures.
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 |
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