g.USBamp: Specs & Features

g.USBamp - gtec's highest accuracy biosignal data acquisition and processing system

g.USBamp is a high-performance and high-accuracy biosignal amplifier and acquisition/processing system. It allows investigation of brain-, heart- and muscle-activity, eye movements, respiration, galvanic skin response and many other physiological and physical parameters. Due to its technical specifications and various software options, this instrument became a standard for many different fields of research, including neuropsychology, life science, medical research and biofeedback/neurofeedback/BCI research.

g.USBamp is USB enabled  and comes with 16  simultaneously sampled biosignal channels with 24 bits. A total of 4 independent grounds  guarantee no interference between the recorded signals.

Award winning technology

The amplifier connects easily to the USB socket on your PC/notebook and can immediately be used for data recording.

Build a multi-channel system with more than 16 channels using multiple g.USBamp devices. A synchronization cable guarantees that all devices are sampling with exactly the same frequency.

The amplifier has an input range of ± 250 mV, which allows recording of DC signals without saturation.

Digital inputs and outputs allow the recording of trigger channels together with the biosignal channels to easily pass analysis results to the outside world.
A short-cut input allows connecting the amplifier inputs quickly to ground potential to protect the amplifier against overflows, which may occur in operating rooms with gamma knifes or other environments.

Ask also for our research version of the device, called g.USBamp-RESEARCH, for a special price.

Buy a g.USBamp and get the BCI2000 book for free! More Details

Product Highlights

  • 16 DC-coupled wide-range input channels per unit, 4 independent grounds, record any type of signal (EEG/ECoG/ECG/EMG/EOG/spikes/...), connect various sensors, stack units for 32/48/64/... channels.
  • 24-bit resolution with simultaneous sampling of all channels with up to 38.4 kHz, digital signal filtering and preprocessing, connect via USB 2.0.
  • Works with passive and with active electrodes, 8 digital trigger inputs/unit, 4 digital outputs/unit, new simplified synchronization of units.
  • Internal digital bandpass and notch filters, built-in calibration unit and impedance checking.
  • Easy configuration and setup via the software, high-speed online data processing for SIMULINK and for LabVIEW available, recommended by BCI2000 & approved under OpenViBE
  • Driver package/API available
  • CE-certified and FDA-listed medical device, safety class: II, conformity class: IIa, type of applied part: CF

EXPERT QUOTES

"We have been using g.USBamp intensively for several years, in collaboration with Slovak Academy of Sciences, for measuring EEG on paretic patients as well as healthy individuals."

 - Prof. Igor Farkas, Comenius University,
   Center for Cognitive Sci., SK

"The g.USBamp allows us to study effects of leadership interactions on both the leader's and the follower's brain and cognitive processes with great flexibility."

 - Prof. Dr. Jens Rowold, TU Dortmund, DE

"The g.USBamp amplifiers make it possible for us to have a mobile and easy to use EEG setup. The suitcases are perfect for quick transportation and rapid setup of the system."

 - Lukas Fiederer,
   University Hospital of Freiburg, DE


EXPERT QUOTES

"We have used the g.USBamps for approximately four years now and the quality of the signals surpasses our greatest expectations. Last year we also invested in the g.Nautilus system and have been able to move from the more stringent laboratory conditions to the real world settings where BCIs find their applications. I would highly recommend both for anyone involved in BCI research.“

 - Associate Professor Natalie Mrachacz-Kersting,
   Aalborg University, DK

"With g.USBamp you don't think about the amplifier anymore... You think about the EEG signals!"

  - Dr. Ales Holobar, University of Maribor, SI

"The g.USBamp really improved the usability of the BCI, enabling interconnection with an external robotic agent to develop assistive technology for locked-in people, enabling them to put their thought in actions. "

  - Ing. Salvatore Tramonte, University of Palermo, IT


More Product Details

Input channel properties

g.USBamp uses wide-range DC-coupled amplifier technology in combination with 24-bit sampling. The result is an input voltage range of +/- 250 mV with a resolution of < 30 nV! This means that any electrophysiological signal can be recorded directly without additional hardware. Neither high electrode offset voltage nor big artifacts resulting from electrical or magnetic stimulation will saturate the amplifier inputs. This feature is an important requisite for various artifact treatment and correction techniques. The use of digital filters avoids hardware-related variations between channels. g.tec's active electrode system can also be connected directly, as well as all of our sensors (e.g. GSR, skin temperature, blood pressure, oxygen saturation, respiration effort and airflow, pulse plethysmography, acceleration, limb movements, snoring sounds, and many more).

Accuracy and data quality

Each of the 16 analog to digital converters operates at 2.4576 MHz. Oversampling 64 times yields the internal sampling rate of 38.400 Hz (per channel and for all channels!). In addition, a powerful floating point Digital Signal Processor performs oversampling and real-time filtering of the biosignal data (between 0 Hz - 2.400 Hz).
Therefore, a typical sampling frequency of 256 Hz yields an oversampling rate of 9.600. This results in a very high signal to noise ratio, which is especially critical when recording evoked potentials in the EEG or identifying small amplitude changes in high-resolution ECG recordings. You are measuring far below the noise-range of conventional amplifiers.

Add more channels or split systems

To set up a multi-channel system (32/48/64 channels), g.USBamps can be stacked. Just add another 16 channels by connecting one more unit to the system. To assure 100% simultaneous sampling of all channels, a simple "SYNC cable" is used to interconnect the devices (via a plug in the rear side). Each input channel can be used for any type of signal (electrophysiological signals or external physiological or physical sensors).

On the other hand, if you have a 64 channel system consisting of 4 amplifiers, you can split the system to have 4 units available.

Test signal generation and calibration

The amplifier can generate an internal sinusoidal-, rectangular-, sawtooth or white-noise test signal. The amplitude and frequency of the signal can be modified to test the recording and analysis chain. An internal calibration unit periodically detects offset and gain values for each channel and uses these values for automatic internal correction. This technique yields the highest possible accuracy - especially critical for high resolution EEG and source derivation/localization.

Skin-electrode impedance

In order to obtain top-quality EEG recordings, the transition impedance between the skin and the electrode must be checked. The internal impedance testing unit measures the impedance for the individual electrodes and the results are displayed in the software. Bad electrodes can be identified easily and skin treatment and gel application can be performed during the impedance testing.

Software options

g.tec's philosophy is to provide a broad spectrum of software solutions for different groups of users (e.g. for engineers, researchers & scientists, physiologists, and medical staff, but also for software developers & programmers). From comfortable Windows-based recording software to MATLAB/SIMULINK and LabVIEW Highspeed Online-Processing environment and device drivers as well as APIs, you will find the appropriate tools for your application. Please see the list of related products/software below for more details. g.USBamp is also supported by some open source research communities such as OpenVibe and BCI2000.

Important information

We give a full 5-year warranty on g.USBamp.
g.USBamp is a safe certified medical device (CE and FDA) for research in humans, even for invasive recordings such as electrocorticography (ECoG). It must not be used for patient monitoring or determination of brain death. Medical diagnoses and decisions about treatment of diseases must not be based (solely) on results obtained with this device.

For ECoG

Ad-Tech, PMT, Unique Medical and Cortec grid electrodes can be used for ECoG recordings.


EEG RECORDING DURING TMS STIMULATION

The following figure shows EEG recordings with the g.USBamp during TMS stimulation with a TMS device from Mag&More. A g.GAMMAcap (size M) was prepared with passive g.LADYbird electrodes and the sampling rate was set to 38.400 Hz and no filters were selected. All electrode locations were prepared with abrasive gel to get a low electrode impedance. The TMS stimulation was done with a biphasic single pulse and about 300 repetitions applied with 1.1 Hz. The figure shows also the position of the TMS coil.

 

Beside g.USBamp, TMS can also be used with g.HIamp. The stimulation artifact with passive electrodes is typically 2 ms long, for active electrodes it is around 6 ms.


available colors for g.USBamp

We are proud to announce that our g.USBamp is available in amazing new colors! If you buy a g.USBamp you can choose your color!
usbamp_standardgrey usbamp_red usbamp_redlilac
standard grey (color code: RAL9006 FS) red (color code: RAL3003) red lilac (color code: RAL4001)
usbamp_gentialviolet reseda usbamp_deepblack
gentian violet (color code: RAL5010) reseda (color code: RAL6011) deep black (color code: RAL9005)

Available configurations

Complete Solutions

read more g.BCIsys: Specs & Features — Complete MATLAB-based Brain-Computer Interface research/development system
product no.: 6032 read more RehaBCI, PC included — 32 channels; consisting of: g.BCIsys32USB; g.VRsys; g.GAMMAbundle for g.USBamp CSP; g.UDPinterface; g.USBamp common spatial patterns model; 3D human avatar (g.AVATAR)
read more g.EEGsys: Specs & Features — complete EEG research systems, ready-to-go installation
read more intendiX: Specs & Features — User-Ready Brain-Computer Interface Applications
product no.: 6095 read more g.USBamp AEP Setup — complete setup for auditory stimulation experiments with g.USBamp; consisting of: ASSR, BAEP, AEP stimulation unit; audio trigger cable for g.USBamp UB; Lecture 4: Evoked potentials; bundle offer (0150, 0240_2, 4053)
product no.: 6038 read more g.USBamp ECG bundle — complete setup for ECG research; consisting of: 1x g.USBamp, CE-certified and FDA listed biosignal amplifier; 1x g.Power - g.USBamp, medical mains power supply; 1x g.GAMMAbox; 1x g.USBmpGAMMAconnector; 16x g.GAMMAclip, active clip electrode; 2x g.GAMMAclipGND, active ground electrode; 2x g.GAMMAclipREF, active reference electrode; 2x disposable Ag/AgCl electrodes; 1x g.USBamp Simulink High Speed Online Processing, single place license; g.BSanalyze Base, ECG Toolbox; Lecture ECG, for ECG teaching
product no.: 6039 read more g.USBamp EMG bundle — complete setup for EMG research; consisting of: 1x g.USBamp, CE-certified and FDA listed biosignal amplifier; 1x g.Power - g.USBamp, medical mains power supply; 1x g.GAMMAbox; 1x g.USBmpGAMMAconnector; 16x g.GAMMAclip, active clip electrode; 2x g.GAMMAclipGND, active ground electrode; 2x g.GAMMAclipREF, active reference electrode; 2x disposable Ag/AgCl electrodes; 1x g.USBamp Simulink High Speed Online Processing, single place license; g.BSanalyze Base, EEG and Classify Toolbox
read more g.BCI2000sys: Specs & Features — Complete BCI system for g.USBamp and g.MOBIlab+ with BCI2000

Hardware and Accessories

product no.: 0230 read more g.USBamp 8 channels (U8) — g.USBamp with 8 channels; 256Hz; no DIG I/O; CE certified; FDA listed; 8 unipolar EEG channels; multi pole input socket
product no.: 0216 read more g.USBamp 16 channels — g.USBamp with 16 channels; 38.4 kHz per channel; 4 separated grounds

See some related products

Electrodes and Sensors

read more g.GAMMAsys: Specs & Features — active electrode system for EEG/EMG/EOG/ECG
read more g.SAHARA: Specs & Features — active dry EEG electrode system
read more g.Electrodes: Specs & Features — various active and passive electrodes for electrophysiological recordings
read more g.Sensors: Specs & Features — various sensors for physiological and physical signals

Hardware and Accessories

read more g.HEADstage: Specs & Features — miniaturized pre-amplifier
product no.: 0247 read more g.Power - for g.USBamp — medical mains power supply for g.USBamp; 110/230 V; 50/60 Hz power line; single 5 V supply
product no.: 0251a read more g.ACCUpack for g.USBamp — rechargeable battery pack; 12V and 5V, 4.5 Ah; for g.USBamp & adapter cable (253a)
product no.: 0252 read more Charging device for g.ACCUpack — automatic charging device for battery pack g.ACCUpack (0151a/c), 110/120 V; 50/60 Hz power line; regional adapter for EU, USA, UK,CN/AUS
product no.: 0281A read more g.USBamp synch cable (dual) SET — synchronization set for 2 g.USBamps consisting of: g.USBamp synch cable (dual), shortcut jumper cable blue, shortcut jumper cable yellow
product no.: 0283A read more g.USBamp synch box (quad) SET — synchronization set for 4 g.USBamps, consisting of: g.USBamp synch box (quad), 3x shortcut jumper cable blue, 3x shortcut jumper cable yellow
product no.: 0225 read more g.USBamp cable for short-cut function (SC) — 3m cable with 3pin screw terminal
product no.: 0274 read more g.TRIGbox: Specs & Features — multimode trigger conditioner box
product no.: 0277 read more Trigger cable for g.USBamp UB — DIO break-out of cable to DSUB15 female; can be used e.g. for 4 trigger channels, from g.TRIGbox (D-sub 15), lenght approx. 3m, for g.USBamp 3.0 (UB-xxx.xx.xx)
product no.: 0278 read more Adapter cable for trigger cable — DSUB15-male to 6x BNC male adapter (including 6x CINCH adapter)
product no.: 0275 read more Trigger cable for g.USBamp UB — with open leads, for DIG I/O Trigger for UB-xxx.xx.xx
product no.: 0240_2 read more audio trigger cable for g.USBamp UB — DIG I/O of g.USBamp UB-xxxx.xx.xx to mindBEAGLE audio trigger adapter box
product no.: 0307b read more external trigger button UB — external trigger button for g.USBamp UB, with 2,5 m cable; 7 pin connector
product no.: 0276A read more Trigger cable for g.USBamp UB — DIG I/O 1 and DIG I/O 2 of g.USBamp UB-xxxx.xx.xx to D-Sub 25 male (PC-parallel-port pinout), 3m
product no.: 3012 read more medical isolation transformer — 600 VA, REO-MED, 6 outputs
product no.: 5051 read more g.USBamp water-proof heavy duty case — water-proof heavy duty case for g.USBamp equipment
product no.: 0219a read more ElectroCap-adapter cable to DSUB25 male for g.USBamp — adapter cable for 25 pin SUB-D 16 channels Electrocap for g.USBamp; standard: A: Screening
product no.: 10040 read more Medical device inspection — recurring medical device inspection (EN62353: 2008) for g.USBamp and g.BSamp
product no.: 1302 read more g.STIMbox: Specs & Features — stimulation box to record and generate trigger signals; 16 digital outputs and 14 digital inputs; C API, MATLAB API and Simulink driver
product no.: 0255 read more Connection cable XLTEK 32 channel to 2 g.USBamps — Connection cable male D-SUB 37pin to 2 g.USBamps; separate GND and REF cables included, connection length 1.75 m; special wiring to be confirmed at order
product no.: 0256 read more Connection box Stellate eAmp 64 channel to 4 g.USBamps — Connection box VHDCI connector to 4 g.USBamps; separate GND and REF cables included, connection length 1.75 m; special wiring to be confirmed at order
product no.: 0257 read more Special 64 channel break out and connection box Nihon Kohden Neurofax 64 channel to 4 g.USBamps — g.tec-65pin connector to 4 g.USBamps; separate GND and REF cables included, connection length 1.75 m; special wiring to be confirmed at order
product no.: 0258 read more Connection cable from 64 channel breakout box to Nihon Kohden Neurofax A connector — Nihon-Kohden-80pin connector to g.tec-65pin connector; connection length 10m
product no.: 0259 read more Connection cable from 64 channel breakout box to Nihon Kohden Neurofax B or C connector — Nihon-Kohden-68pin connector to g.tec-65pin connector; connection length 10m
product no.: 0226r read more shortcut jumper cable for 2 channels, extra long — shortcut cable for 2 channels; medical safety connector; length 500mm; can be daisy chained; color: red
product no.: 0226b read more shortcut jumper cable for 2 channels, extra long — shortcut cable for 2 channels; medical safety connector; length 500mm; can be daisy chained; color: blue
product no.: 0226y read more shortcut jumper cable for 2 channels, extra long — shortcut cable for 2 channels; medical safety connector; length 500mm; can be daisy chained; color: yellow

Software

read more g.NEEDaccess — network enabled easy data access
product no.: 6305 read more g.NEEDaccess API — g.tec general device data access interface; application programming interface
read more High-Speed Online Processing under Simulink: Specs & Features — read biosignal data directly into SIMULINK; highly optimized hardware-interrupt controlled device driver; data processing with maximum system speed; signal analysis blocks
product no.: 0168 read more High-Speed Online Processing under LabVIEW: Specs & Features — allows acquiring biosignals like EEG, EMG, EOG, and ECG with LabVIEW
product no.: 0167a read more g.Recorder for g.USBamp — fully GUI-based (graphical user interface); comfortable biosignal visualization and storage; full control of the amplifier and header
product no.: 0167EXT read more g.Recorder Extension Pack — additional features for g.Recorder: real-time EP (evoked potential) visualization, video recording, data viewer mode, feature analysis: HR, HRV, CSA, CFM
product no.: 0139 read more g.USBamp P300 model — 8-channel P300 based speller; prerequisite: SIMULINK HIGH SPEED ONLINE PROCESSING (0260a)
product no.: 0140a read more g.USBamp Ping Pong model — 2 subject and 4-channel motor imagery based game; prerequisite: SIMULINK HIGH SPEED ONLINE Processing (0260a)
product no.: 0141a read more g.USBamp SSVEP BCI model — 8 channel SSVEP based control
product no.: 1303a read more SSVEP model and Hardware for g.USBamp — bundle for SSVEP based robot control; consists of g.USBamp SSVEP model, g.SSVEPbox, g.STIMbox and small robot with bluetooth interface
product no.: 0142 read more g.USBamp common spatial patterns — Simulink model to calculate CSPs for 2 or 3 classes; variable amount of electrodes, tutorial
product no.: 0263 read more g.USBamp C API — sophisticated data acquisition and processing software almost under any programming language
product no.: 0263a read more g.USBamp C API & BCI2000 — application programming interface (API) for the user specific application (eg. developed in C/C++); BCI2000 driver; BCI2000 software package
product no.: 0137 read more g.BCI SOCI model — Screen Overlay Control Interface module; can be used especially for virtual reality (VR) applications and remote control of devices to provide the standard user interface by directly embedding the BCI stimuli; generates CVEP or SSVEP stimuli and supports single symbol and row column for P300 stimulation. single place licence; prerequisite MATLAB R2014a for OS English Win 64 (Windows 7), SIMULINK HIGH-SPEED ONLINE Processing, g.BSanalyze Base, EEG and Classify Toolbox
product no.: 0311 read more g.DISTRIBUTEDeeg — allows you to record biosignal data from different distributed PCs (DataPCs) in the network and transmit the recorded data to a central evaluation / data storage PC (EvalPC).
product no.: 0136 read more g.BCI CVEP model — Code-based BCI model; BCI systems can also use pseudo-random stimulation sequences on a screen (code-based BCI); prerequisite SIMULINK HIGH-SPEED ONLINE Processing, g.BSanalyze Base, EEG and Classify Toolbox
product no.: 0169a read more Linux API for g.USBamp — driver software package for g.USBamp; full access to recording buffer; for user specific applications on the PC; single place license.
product no.: 0111 read more g.RTanalyze: Specs & Features — real-time biosignal processing blockset under SIMULINK; real-time algorithms
product no.: 6306 read more g.NEEDaccess MATLAB API: Specs & Features — for realizing your own sophisticated data acquisition and processing software under MATLAB®
product no.: 0264 read more g.UDPinterface: Specs & Features — data exchange with network connection between Simulink/MATLAB on different PCs (eg. BCI, VR, XVR, ...); single place licence; prerequisite MATLAB for OS English Win 32/64, SIMULINK
product no.: 0291 read more g.EYEtracking Interface for SIMULINK — read eyetracking information into Simulink
product no.: 0148 read more ACTOR BCI - Application ConTrol and Online Reconfiguration (ACTOR) protocol — Simulink model with matrix interface that can be remotely updated or configured with configuration files; sends commands to external devices
product no.: 0147 read more hybrid BCI model — SSVEP and P300 hybrid based control; prerequisite SIMULINK HIGH-SPEED ONLINE Processing, g.RTanaylze
product no.: 0149 read more EMG/EOG/mouse control — Simulink model to control the matrix interface with EMG, EOG or a mouse
product no.: 0146 read more hyperscanning BCI model — multi-user P300 and Motor Imagery based control; prerequisite SIMULINK HIGH-SPEED ONLINE Processing, g.RTanalyze, g.BSanalyze Base, EEG and Classify Toolbox
product no.: 0144 read more g.VIBROTACTILEp300 Model — 2-, 3- and 8-channel vibrotactile P300 based BCI control; prerequisite: SIMULINK HIGH SPEED ONLINE Processing, g.BSanalyze Base, EEG and Classify Toolbox

Complete Solutions

read more g.PHYSIOobserver: Specs & Features — Classify workload, emotions, movements based on physiological parameters in real-time

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