Analog Input Box (AIB) (Including 8 channels)
The Analog Input Box (AIB) is an extra option to acquire additional analog input signals which have to be kept isolated from the subject. For example mains powered equipment. Up to 32 channels can be acquired simultaneously with up to 256 channels from the AD-box connected to the subject.
A first fiber carries the data coming from the subject connected AD-box to the AIB, then a second fiber with the combined data goes from the AIB to the receiver where the total 288 channels are processed.
Ordercode: AIB +/- 1Volt
Price: EUR 4000,- (including 8 channels)

Headbox with 32 Active TouchProof connectors.

Headbox to connect up to 32 Active TouchProof electrodes to a standard ActiveTwo acquisition system.
- Inputs: 32 x Touchproof connector, 1 x CMS/DRL DIN4 connector.
- Outputs: 1 x 68-pole fine pitch female connector.
- Including 68-pole male to 68-pole male flatcable. (1 meter)

Ordercode: HEADBOX ACT32.
Price: EUR 1000,-

Electrode holders

BioSemi Active electrode holders complete with X-ring. These holders are easily mounted in the headcap, and are designed to hold the pin-type Active electrodes. The holders can be disassembled and relocated in the cap in order to change electrode positions. 11mm, 14mm or 17mm.

Price: EUR 4 per holder
Empty headcap
Headcap by ECI, empty cap without holes and electrodes, complete with 73 or 128 indication dots for standard electrode positions (the user is free in the selection of the electrode positions)
Ordercode: CAP size NO HOLDERS

Price: EUR 200 per cap (empty cap with 0 holders)

Adhesive disks

Double sided adhesive disks for firm placement of the Active electrodes on the skin. Two sizes are available: 20mm x 8mm or 13mm x 5mm (outside x inside). Both sizes are suited well for BioSemi Flat-type active electrodes.

Ordercode: DISK 13x5
Ordercode: DISK 20x8
Price: EUR 80 per pack of 500
Signa gel

Electrode gel, Signa gel by Parker, low impedance highly conductive gel, specially formulated to maximize contact between the body surface and the Active electrodes, bacteriostatic, non-irritating, non-staining, and non-gritty. Sufficient for approximately 60 different 32-channel measurements.

Ordercode: SIGNA (EUR 12 per tube of 250 gram)
Ordercode: SIGNA BOX12 (EUR 120 per box of 12 tubes)

Electrode paste, Elefix by Nihon Kohden, low impedance highly conductive paste, specially formulated to stick the electrodes on the skin without additional adhesive disks.

EUR 50 per container of 400gram


Special syringe with blunt plastic tip for easy injection of electrode gel in the BioSemi electrode holders. 12cc (enough for a measurement of 32 channels)

EUR 1 per syringe


Respiration belt

Respiration belt SleepSense 1387-kit. Using a piezo-electric crystal, the respiration effort sensor converts chest or abdominal respiration movement to clear, reliable respiration waveforms. Strong reliable signals are available because the respiration belt uses the powersupply from the ActiveTwo system. The respiration input can be mounted on the front of the AD-box when a system is ordered, or at a later stage.

Respiration input including respiration belt. EUR 1125,-
Respiration belt (cord only, no input) EUR 400,-

Galvanic Skin Response
With this ActiveTwo accessory, the impedance of the skin can be measured. The GSR exists of 2 passive Nihon Kohden electrodes to induce an oscillator signal synchronized with the sample-rate. Because the BioSemi GSR uses "Lock-in detection", the stimulus-current can be as low as 1uA. The low-current and synchronized oscillator ensure that the biopotential measurements (ECG,EEG,EMG) are not corrupted by the GSR oscillator signal. The GSR input can be mounted on the front of the AD-box when a system is ordered, or at a later stage.
GSR input including GSR cord. EUR 1125,-
GSR cord only. EUR 150,-

Temperature sensor
With this high precision temperature sensor from HP (Agilent 21078A), skin temperatures can be measured. The temperature sensor directly plugs into the front of the ActiveTwo. The temperature input can be mounted on the front of the AD-box when a system is ordered, or at a later stage.
Temperature input including temperature cord. EUR 1100,-
Temperature cord only. EUR 300,-


Plethysmograph sensor (blood flow)
This Plethysmograph sensor from ADI instruments (MLT1020) uses an infrared photoelectric sensor to detect changes in tissue blood volume. The Plethysmograph sensor directly plugs into the front of the ActiveTwo. This sensor can be ordered with a finger clip (/F option), with a Velcro strap (/p option) or with an ear clip (see picture, /E option). Click here for the .pdf specifications of the plethysmograph. The Plethysmograph input can be mounted on the front of the AD-box when a system is ordered, or at a later stage.
Plethysmograph input including Plethysmograph cord. EUR 900,-
Plethysmograph cord only. EUR 700,-

Photo sensor

Light detector for direct connection to the Ergo input.
The sensor consists of a sensitive PIN diode with integrated trans impedance amplifier. This sensor can be used for measuring visual stimuli simultaneously with the physiological data (EEG). This allows checking the timing accuracy of the used stimulus setup. The Ergo input can be mounted on the front of the AD-box when a system is ordered, or at a later stage.

Photo sensor input including Photo cord. EUR 550,-
Photo sensor cord only. EUR 150,-

ABR Auditory Brainstem Response

ABR electrodes are optimized for the frequency band 100 Hz till 3 kHz (AC operation), whereas the standard EX electrodes are optimized for low frequency (DC) signals and low power consumption. The ABR electrodes need a special ABR input on the front of the AD-box, additional special channels, and special acquisition software. The ABR cord has 3 active electrodes for Left, Reference and Right.
- Bandwidth 100 Hz to 3 kHz (16 kHz sample rate)
- AC input range 5 mVpp (AC amplification)
- DC input range ± 250 mV
- Noise is 2 uVpp in a bandwidth of 100 Hz till 3.3 kHz.
- CMRR is 160 dB @ 50 Hz.
- Standard cable length is 150 cm.

ABR input including ABR cord. EUR 3000,-
ABR cord only. EUR 500,-

Ergo input

Extra Aux connector with bi-polar analog input for isolated sensors.
This general purpose analog input can be used for all kinds of isolated auxiliary signals such as: custom made GSR measurement devices, microphones, photo sensors, response switches). The Ergo connector is a DIN 5-pole connector with a 5 Volt power supply available (300 mA max). The Ergo input can be mounted on the front of the AD-box when a system is ordered, or at a later stage.
- Input range: +/- 1 Volt.

Note: For un-isolated sensors use the AIB.
Single Ergo (1 x bi-polar input) EUR 400,-
Dual Ergo (2 x bi-polar input) EUR 800,-

Active strain gage
BioSemi can equip your force transducers with a miniature (15x30mm) precision strain gage amplifier. This makes your strain gage Active, the output signal is processed by the ActiveTwo AD-box just like any other active sensor. The advantages are that all influences of the connection cable are completely eliminated, no cable interference and no temperature drift. The Active strain gage contains a low-noise, low-power, zero-drift, chopper-stabilized differential amplifier. The power supply is from the ActiveTwo AD-box (16mA total bridge current). The modification to the Active strain gage can be performed for quarter, half and full bridge strain gage configurations. The supplied LabVIEW module automatically zero's the bridge and amplifier offset on startup. No further hardware trimming is necessary. The photo shows a precision force measurement for finger pressure, the amplifier is sealed in resin on the left side of the ergometer.
Note: The Active strain gage connects to the Ergo input.
EUR 1300,- up to 1500,- (depending on the mechanical work)

Jazz eye tracker

The Jazz eye tracker system is a development of a Polish academic research group, led by Prof. Ober. A special 'synchronic' version has been made on OEM basis for BioSemi for interfacing directly with the ActiveTwo. The synchronic Jazz system consist of 3 building blocks:
- Head mounted eye-tracker.
- Transmitter with twin fiber-optic connection (data out, sync in).
- Receiver with direct connection to BioSemi USB2 receiver.

The sample rate of the Jazz is perfectly synchronized with the ActiveTwo sample rate. The Jazz receiver connects to an optical input/output on the BioSemi USB2 receiver. Our LabVIEW acquisition software combines the ActiveTwo data and Jazz data, the Jazz channels are available simply as extra channels in the resulting BDF file.

More info about the Jazz eyetracker can be found in this .pdf file.
EUR 8000,- (including ActiView module for simultaneous eye tracking acquisition)

Microphone to record audio stimuli and responses. A highly effective built-in spherical filter minimizes wind and breath 'pop' noise. Connects directly to the standard BioSemi ActiveTwo Ergo input on the AD-box.
Note: Connects to the Ergo input.
Microphone including Ergo input. EUR 700,-
Microphone cord only. EUR 300,-

Response switch (optimal response timing and subject isolation)

Response switches for direct connection to the Ergo input or Switch input on the AD-box.
These response switches ensure accurate timing of the response moments (pulse is mixed directly with the incoming EEG signals) as well as optimal isolation of the subject (no grounded equipment near the subject). Using the USB trigger port also has good timing, but has the disadvantage of bringing the safety grounds near the subject. Under Windows, it is advisable to only use the PC keyboard (ActiView: function keys F1-F8) for none time critical responses because Windows OS is not a real time operating system. There is no fixed timing relation between incoming data through the USB port (EEG data) and signals coming from the keyboard (subject response). The timing relation between the USB port (EEG data) and the keyboard (subject response) can not be determined precisely under Windows.
The BioSemi Response switches connected to the AD-box will make sure your response timing is accurate and your subject isolation remains optimal !
Response switch including Ergo input or Switch input. EUR 475,-
Response switch only. EUR 75,-

Daisy chain (Optical input on AD-box)
AD-boxes can be daisy-chained for simultaneous synchronized measurements on 2, 3 or 4 subjects. When AD-boxes are equipped with Daisy chain inputs, then they can be connected by optical fibers: Box1 --> Box2 --> Box3 --> Box4 --> USB-receiver plus computer.
Because the AD-boxes are only connected by optical fibers (each system has its own battery power supply), the systems and subjects remain completely galvanically isolated form each other (optimal interference suppression and safety). Distance between the subjects can be up to hundreds of meters.

The sample rate of all systems is synchronized. All signals from the 2, 3 or 4 systems are processed in a single computer, and stored in a single file. In daisy chain mode, the systems can be used with a maximum of 128+8+sensors per system on 2 kHz sample-rate: Speedmode explanation.
We do not support coupling systems for measurements on a single subject. The reason is that signal quality may suffer when montages are made that contain channels from different AD-boxes (channels from one AD-box subtracted from channels in another AD-box). Optimal signal quality is achieved when all ADCs refer to a single continuous ground-plane on a single mother board.
Ordercode: DAISY
Price: EUR 1000,-

Presentation cable
This cable connects the stimulation PC (parallel port) with the trigger input/output connector (37 pin female sub-D) of the BioSemi USB receiver. Cable is approximately 4.5 Meters long.
EUR 100,-

Touchproof Inline cable
In-line adapter cable. This cable connects to the 8 EX inputs on the top of the AD-box, and have an active electrode circuitry with standard 1 pole touchproof connector on the other end. Standard passive electrodes (surface or needle) connect to the in-line adapters. Keep the cable between in-line adapter and passive electrode as short as possible to reduce noise (a few cm is optimal).
Price: EUR 50,-