Tobii Pro Spectrum User manual

Tobii Pro Spectrum Eye Tracker
User’s Manual

User’s manual Tobii Pro Spectrum Eye Tracker
Version 2.0
11/2017
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While every precaution has been taken in the preparation of
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responsibility for errors or omissions, or for dama es
resultin from the use of information contained in this
document or from the use of pro rams and source code that
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dama e caused or alle ed to have been caused directly or
indirectly by this document.
Content subject to chan e without notice.
Please check Tobii web site www.tobiipro.com for updated
versions of this document.

Table of Contents
1 Introduction.................................................................................................................................... 1
1.1 Overview...............................................................................................................................1
1.2 Basic operatin principles .......................................................................................................1
1.3 Product Versions....................................................................................................................1
2 Hardware Packa e Content ........................................................................................................... 2
3 Product Care ................................................................................................................................. 3
3.1 Transportation and stora e......................................................................................................3
3.2 Cleanin ...............................................................................................................................3
3.3 Transportin the Pro Spectrum ................................................................................................3
3.4 Disposin of the Pro Spectrum ................................................................................................3
4 Settin up the Tobii Pro Spectrum ................................................................................................. 4
4.1 Prerequisites .........................................................................................................................4
4.2 General use...........................................................................................................................4
4.3 Mountin the monitor to the eye tracker unit...............................................................................4
4.4 Connectin the eye tracker......................................................................................................5
4.4.1 Powerin on the Pro Spectrum .................................................................................5
4.5 Monitor settin .......................................................................................................................6
5 Setup Options ............................................................................................................................... 7
5.1 Mountin the Pro Spectrum on a VESA mount (setup 3 in the ima e above) ..................................8
5.2 Mountin a scene camera........................................................................................................8
6 Eye tracker confi uration................................................................................................................ 9
6.1 Confi uration and settin s.......................................................................................................9
6.2 Installin the Tobii Pro Eye Tracker Mana er ..............................................................................9
6.3 Updatin the eye tracker’s firmware..........................................................................................9
6.4 Confi urin the Pro Spectrum in the Pro Eye Tracker Mana er...................................................10
6.4.1 Chan in the Pro Spectrum's frequency settin ........................................................10
6.4.2 Confi urin the Pro Spectrum for standalone use......................................................10
6.5 Usin the TTL input port for external event recordin .................................................................10
6.5.1 TTL data port specification .....................................................................................10
Appendix A Tobii Pro Spectrum – Specifications.............................................................................. 11
A1 Eye trackin specifications ....................................................................................................11
A2 Unit specifications................................................................................................................12
A3 Certifications .......................................................................................................................13
A3.1 Compliance and Certification..................................................................................13
A4 Software Options.................................................................................................................14
Appendix B Recommended monitor ................................................................................................. 15
Appendix C Glossary........................................................................................................................ 16
Appendix D Safety and compliance .................................................................................................. 18
D1 Safety.................................................................................................................................18
D1.1 Emer ency Warnin ..............................................................................................18
D1.2 Infrared Warnin ...................................................................................................18
D1.3 Epilepsy Warnin ..................................................................................................18
D1.4 Child Safety .........................................................................................................18
D1.5 Do not open Tobii Pro Spectrum .............................................................................18
D1.6 Environment .........................................................................................................19
D2 Other limitations and considerations .......................................................................................19

D2.1 Intended use ........................................................................................................19
D2.2 Li ht conditions ....................................................................................................19
D2.3 Eyelashes.............................................................................................................19
D2.4 Droopy eyelids......................................................................................................19

1 Introduction
1.1 Overview
This user manual describes the features and functionality of the Tobii Pro Spectrum eye tracker. The Pro Spectrum can be used
in various setups, either with an attached monitor or in standalone form in order to perform eye trackin with physical objects.
The typical setup is the Pro Spectrum connected to a PC runnin Tobii Pro Lab, as you see in the ima e below.
The desi n allows the subject to move naturally durin recordin while still obtainin hi h accuracy and precision.
1.2 Basic operating principles
The Tobii Pro Spectrum use infrared illuminators to enerate reflection patterns on the corneas of the subject’s eyes. These re-
flection patterns, to ether with other visual data about the subject, are collected by ima e sensors. Sophisticated ima e-proc-
essin al orithms identify relevant features, includin the eyes and the corneal reflection patterns. Complex mathematics is
used to calculate the 3D position of each eyeball and the aze point on the screen (or when you don’t use a screen, for the aze
point on the object); in other words, it tells you where the subject is lookin .
Eye trackers from Tobii Pro are desi ned for use in indoor office environments and trackin on humans.
1.3 Product Versions
The Pro Spectrum is available in four different product versions: 1200 Hz, 600 Hz, 300 Hz and 150 Hz. This is the eye tracker’s
maximum samplin frequency, but the eye tracker can be used with lower frequencies as well. The 600 Hz, 300 Hz and 150 Hz
versions can be up raded to a faster version. Contact your sales representative or Tobii Pro for more information.
Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US 1 Introduction 1

2 Hardware Package Content
A. An le meter I. USB cable for connection between the PC and the moni-
tor’s inte rated USB hub
B. Measurin tape J. Cold shoe for mountin of a user camera
C. Power cables for monitor (UK, US, EU and Aus/China) K. DisplayPort cable
D. Monitor L. HDMI cable
E. Eye tracker M. Cleanin cloth
F. Monitor mountin bracket N. Fabric cord sleeve for collectin the cables
G. Power cables for eye tracker (UK, US, EU and Aus/China) O. Ethernet cable
H. Power adaptor for eye tracker
22 Hardware Packa e Content Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US

3 Product Care
3.1 Transportation and storage
For transportation and stora e, the recommended ran e for temperature and humidity for the device is as follows:
•Temperature: -40°C to 70°C (-40°F to 158°F)
•Humidity: 20% to 95% (no condensation on the device)
The Pro Spectrum is not waterproof or water resistant. The device should not be kept in excessively humid, damp or
wet conditions. Do not submer e the device in water or in any other liquid. Be careful not to spill liquids on the
device.
3.2 Cleaning
Before cleanin the Pro Spectrum, unplu all cables. Use a soft, sli htly damp, lint-free cloth. Avoid ettin moisture in openin s
on the device. Don’t use window cleaners, household cleaners, aerosol sprays, solvents, alcohol, ammonia, or abrasives to clean
the device.
Please be aware that scratches on the front surface of the eye tracker may result in impaired eye trackin
performance.
3.3 Transporting the Pro Spectru
Before stora e or shippin , disconnect all cables and use the travel case and packa in materials provided.
3.4 Disposing of the Pro Spectru
Do not dispose of Pro Spectrum in eneral household or office waste. Follow your local re ulations for disposal of electronic
equipment.
Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US 3 Product Care 3

4 Setting up the Tobii Pro Spectru
4.1 Prerequisites
As with most electronic devices, the Pro Spectrum enerates heat durin use and needs adequate ventilation. Allow for free air
flow around the unit and never cover it as this will restrict the air flow and lead to overheatin .
4.2 General use
The Pro Spectrum is best kept in dry conditions at room temperature. The recommended ran e for temperature and humidity
durin operation is as follows:
•Temperature: 15°C to 30°C (59°F to 86°F)
•Humidity: Max 20% to 95% (no condensation on the device)
4.3 Mounting the onitor to the eye tracker unit
The Pro Spectrum is delivered with the monitor already mounted. If this for any reason is not the case, e. . someone has been
usin the unit as a standalone eye tracker, you will have to attach the monitor to the base a ain. The mountin and removal of
the monitor is very quick due to its one-screw fastenin .
1. Make sure the eye tracker is placed on an even and steady surface.
2. Hold the monitor firmly and insert the lower end of the mountin bracket into the slot on the top of the eye tracker.
3. When the lower end of the mountin bracket is fully inserted into the slot, ently tilt the screen forward.
4. When the mountin bracket is in place, secure it by pushin the lock knob downwards and turnin it until it is firmly in
place.
If you need to remove the monitor, repeat the above steps in the reverse order.
44 Settin up the Tobii Pro Spectrum Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US

4.4 Connecting the eye tracker
The Pro Spectrum is connected to a standard Ethernet network with a RJ–45 connector.
1. Attach the supplied Ethernet cable to the correspondin Ethernet socket on the eye tracker.
2. Attach the other end of the Ethernet cable to the Ethernet socket on your PC. It is also possible to connect the eye track-
er to a switch connected to your LAN.
3. Attach the supplied power adapter cable to the correspondin outlet on the eye tracker.
a. Choose the power cable with the power plu suited for the electrical outlet and connect the other end to the AC
adapter.
b. If neither of the power plu s suits your needs, please contact your sales representative or Tobii Pro Support for
assistance.
c. Insert the power cable plu to a mains power outlet.
4.4.1 Powerin on the Pro Spectrum
The Pro Spectrum has one power switch located on its back side. Use it to turn on or switch off the eye tracker. We recommend
that you shut off the unit after the workday or for lon er periods of inactivity.
Durin startup, the illuminators in the front of the Pro Spectrum, will lit up one by one to indicate that the LED-hardware is OK.
Approximately 20 seconds after you power on, a short beep will be heard. This means that the processor module has loaded
the BIOS and has be un to load the operatin system.
After another 20 seconds you should hear two lon beeps. This means that the system is ready for use.
If anythin oes wron (no matter the cause), you will hear three short beeps approximately 40 to 50 seconds after the power-
in -on sequence, followed by a short pause and then another three short beeps.
To turn off the eye tracker, press the power switch. Durin the shut off phase, the power switch indicator lamp will flash. De-
pendin on the internal state, the powerin down could take up to 20 seconds.
Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US 4 Settin up the Tobii Pro Spectrum 5

To force the shutdown of the Pro Spectrum, hold the power switch depressed for at least 5 seconds.
4.5 Monitor setting
The Pro Spectrum is supplied with a pre-mounted 23.8” monitor.
Please note that the monitor has two power switches, one main power switch on the backside and one ON/OFF
switch on the front. Make sure the main switch is ON before you try to start the monitor with the front placed ON/OFF
switch.
1. Attach the supplied DisplayPort or HDMI cable to the correspondin connector on your computer.
It is possible to use any of the other display interfaces on the monitor as well. However, for the best perform-
ance we recommend DisplayPort or HDMI, dependin on what your PC is equipped for.
2. Choose the power cable with the plu suited for the wall outlet and connect the other end to the correspondin outlet
on the monitor.
3. Insert the power cable plu to a power outlet.
4. If neither of the plu s works with your power outlet, please contact your sales representative or Tobii Pro Support for
assistance.
64 Settin up the Tobii Pro Spectrum Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US

5 Setup Options
1. This represents the Pro Spectrum As delivered with monitor mounted on the eye tracker
2. The Pro spectrum as a standalone eye tracker without monitor
3. Eye tracker and monitor to ether on a VESA 100x100 mount.
(For instructions of how to remove the stand and mount the eye tracker and monitor on the VESA mount, see the section
below.)
4. Standalone with monitor
It is possible to use the eye tracker with another monitor but that is not recommended (see Appendix B).
Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US 5 Setup Options 7

5.1 Mounting the Pro Spectru on a VESA ount (setup 3 in the i age
above)
The Pro Spectrum can be mounted on a standard VESA 100x100 mount. Proceed in the followin way:
1. Remove the stand by unscrewin the two screws from the underside (see ima e below).
2. Fold the two le s upwards so they lie neat a ainst the eye tracker’s side panels (as in setup 3 in the Setup Options-im-
a e above). Make sure they don’t cover the ventilation holes on the side panel.
3. Attach the VESA mount to the bracket with four screws suitable for your VESA mount and the bracket.
When you no lon er need to have the eye tracker mounted on a VESA mount, perform the above procedure in reverse order to
attach the stand a ain.
5.2 Mounting a scene ca era
Beneath the eye tracker there is a mount used for attachin a user scene camera (purchased separately). Be in by attachin
the enclosed mountin bracket onto your camera unit. Then slide the assembly into the scene camera mount and ti hten the
screw.
85 Setup Options Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US

6 Eye tracker configuration
6.1 Configuration and settings
The Pro Spectrum is confi ured via Tobii Pro Eye Tracker Mana er; a confi uration and settin utility available online free of
char e This utility allows you to confi ure different settin s for all of your connected eye trackers, like samplin frequency, stand
alone usa e and more. In the Pro Eye Tracker Mana er you can also up rade and down rade your eye tracker firmware. Pro
Lab (see Appendix A4) offers a limited set of eye tracker confi uration settin s. Please see the documentation for the software
you are usin for more information.
6.2 Installing the Tobii Pro Eye Tracker Manager
1. Download and install Pro Eye Tracker Mana er from http://www.tobiipro.com/learn-and-support
6.3 Updating the eye tracker’s fir ware
From time to time, Tobii Pro will release updates for the eye tracker firmware that will improve its performance and/or introduce
new functionality. The latest firmware can be downloaded from the Tobii Pro Support website http://www.tobiipro.com/learn-
and-support. Make sure to re ularly check for and update to the latest version of the software and firmware.
This is how you update the firmware:
1. Download the firmware update file from the above website and save it on your computer.
2. Start the Pro Eye Tracker Mana er on your computer. After a short network scannin period, available eye trackers will
show up in the “Connected Eye Trackers” pane.
3. Select the Pro Spectrum eye tracker for which you want to up rade the firmware.
4. In the “Eye Tracker Information” pane, you will now see information about the selected eye tracker. If the stated firmware
version is lower than the downloaded one, click ‘Browse’ to open the “Choose firmware update packa e” dialo .
5. Browse to the directory containin the firmware file you downloaded in step 1.
6. Select the downloaded firmware file and click ‘Open’.
7. Durin the firmware update a “Work in Pro ress” indicator appears in the “Eye Tracker Information” pane. (Pro Spec-
trum may restart several times. This is not an error.)
8. When the update is done the new firmware version is reflected in the eye tracker information. There is no need to restart
your Pro Spectrum.
If needed, it is possible to down rade the firmware. To perform a firmware down rade, you need to start by resettin
the eye tracker to factory defaults by performin the followin steps:
1. Turn on the eye tracker and confirm that it appears in Pro Eye Tracker Mana er.
2. Press the recessed reset button (located between the power connector and the data port on the connector panel
at the back of the eye tracker) with a pointy device (i.e. a strai htened paper clip) until you hear a beep.
3. Release the reset button.
The Pro Spectrum eye tracker will restart one or more times as part of the down rade process (The eye tracker may
restart several times. This is not an error.). After a while, your eye tracker will appear in Pro Eye Tracker Mana er
a ain.
You can now install the desired firmware version by followin the steps described above for firmware up rade.
Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US 6 Eye tracker confi uration 9

6.4 Configuring the Pro Spectru in the Pro Eye Tracker Manager
In the Pro Eye Tracker Mana er you can chan e some settin s for your Pro Spectrum. For instance, you can create and recall
setups for usin the eye tracker in standalone mode and chan e the eye tracker’s frequency.
6.4.1 Chan in the Pro Spectrum's frequency settin
1. Start the Pro Eye Tracker Mana er on your computer. All available eye trackers will show up in the “Connected Eye
Trackers” pane.
2. Select the eye tracker for which you want to chan e the frequency settin .
3. The ri ht pane expands to show different settin s for the eye tracker. Under “Tracker Specific Settin s,” you will see the
name of the eye tracker with the available frequency options.
4. Choose the desired frequency settin amon the available options.
6.4.2 Confi urin the Pro Spectrum for standalone use
1. Start the Pro Eye Tracker Mana er on your computer. All available eye trackers shows up in the “Connected Eye Track-
ers” pane.
2. Select the eye tracker you want to confi ure for standalone use.
3. Under “Physical Eye Tracker Setup”, click on the drop down list called ‘Preset’ and choose ‘Create new preset’.
4. In the next window, called “Stimuli Area,” enter the necessary settin values for your confi uration and click on ‘Next’
when you are done.
5. In the “‘Eye Tracker” window, you can set the eye tracker’s different physical an le values. Click on ‘Next’ when you are
done.
6. Finally, in the last window called “Name your settin ”, you can ive your new preset a name. Choose a descriptive name
and press ‘Finish’.
7. You are then returned to the Pro Eye Tracker Mana er main window and your new preset will be the chosen one. If you
want to o back to the standard preset, choose it in the drop down list box.
6.5 Using the TTL input port for external event recording
The Pro Spectrum is equipped with a di ital data input port that records events in up to 8 parallel TTL si nals. The events are re-
corded with a time stamp accuracy better than 50 µs. The detected events are available in decimal format (0–255) throu h ei-
ther Pro Lab or the Tobii Pro SDK. The TTL si nal can be combined to obtain up to 256 different events.
Any di ital si nal source fulfillin the electrical specification can be connected to the tracker. One example of such a device is
the Cedrus Stimtracker.
6.5.1 TTL data port specification
Interface: 8 bit parallel TTL input (DBc9)
TTL levels: Vin < 0.8 V => Lo ical 0; Vin > 2 V => Lo ical 1
Pinnin : pin 1-8: inputs; pin 9: GND
Input volta e interval: 0–5 V
Connector shieldin : connected to system chassis round
Input confi uration: inputs (pin 1-8) are connected to pull up resistors and are opto-isolated.
10 6 Eye tracker confi uration Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US

Appendix A Tobii Pro Spectru –
Specifications
A1 Eye tracking specifications
The characteristics of the aze data from an eye tracker can be described in terms of accuracy and precision. Accuracy
describes the an ular avera e distance from the actual aze point to the one measured by the eye tracker. Gaze precision
describes the spatial variation between successive samples collected when the subject fixates at a specific point on a stimuli.
Eye trackin technique Binocular bri ht and dark pupil trackin
Two cameras capture stereo ima es of both eyes for the
accurate measurement of eye aze and eye position in 3D
space, as well as pupil diameter
Samplin frequency 60, 120, 150, 300, 600 or 1200 Hz (max. frequency depends
on product version)
Samplin frequency variability Less than 0.3% of selected samplin frequency
Accuracy* 0.4° at optimal conditions (down to 0.1°)
Precision* 0.06° RMS at optimal conditions (down to 0.04°)
Precision filtered* 0.01° RMS at optimal conditions (down to 0.01°)
Maximum aze an le 30°
Freedom of head movement Width x hei ht: 34 cm x 26 cm (13.5’’ x 10’’) at 65 cm (at least
one eye tracked).
Operatin distance 55 to 75 cm (22’’ and 30’’) from the eye tracker reference point
Total system latency Less than 5 ms at 1200 Hz
Blink recovery time 1 frame (immediate)
Gaze recovery time Less than 150 ms
Recommended monitor Supplied 23.8” monitor (see note below)
Data output (for each eye) Timestamp
Gaze ori in
Gaze point
Pupil diameter
Eye ima e data stream Eye ima e stream frequency is approx. 2x15 Hz
Zoomed-in eye ima es are available in trackin mode
Full-frame camera ima es available in aze recovery mode
TTL input stream 8–bit timestamped data (256 event codes)
Event driven detection with a timestamp accuracy of 50 µs
Tracker and client time synchronization Inte rated synchronization between the eye tracker time
domain and the client computer time domain, with an accuracy
of 100 µs.
*Tobii Pro uses an extensive test method to measure and report performance and quality of data. Please download
the data quality test report for more detailed information: https://www.tobiipro.com/tobii-pro-spectrum/.
For more information about output data and the supplementary data stream, see the Pro SDK documentation here:
http://www.tobiipro.com/product-listin /tobii-pro-sdk/.
Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US Appendix A Tobii Pro Spectrum – Specifications 11

A2 Unit specifications
The Pro Spectrum is an inte rated eye tracker with a removable 23.8’’ monitor. Removin the monitor transforms the inte rated
eye tracker into a standalone eye tracker.
Eye tracker
Dimensions 55 cm x 18 cm x 6 cm (22” x 7” x 2’’)
The eye tracker is mounted on a stand which raises it from the
surface 9 cm (approximately 4”)
Wei ht 5.1 k (11.4 lbs.)
With the power supply unit, the wei ht is 5.7 k (12.9 lbs.)
Eye tracker processin Inte rated in the eye tracker unit
User camera mount Standard 1/4” thread
Connectors TTL input: 8-bit (DB-9 connector)
Communication: Ethernet (RJ-45 connector)
Power supply: 24 VDC (5.5 mm connector)
Power Maximum rated power consumption: 96 W
Typical power consumption: 60 W
External power supply Input: 100-240 VAC 50/60 Hz
Maximum rated power consumption: 120 W
No load power consumption: <0.15 W
Ener y efficiency level: VI
Complies with EISA 2007/DoE, NRCan, AU/NZ MEPS, EU
ErP and CoC Version 5
Monitor
Monitor model name EIZO FlexScan EV2451
Panel type IPS, LED backli ht
Screen size (dia onal) 23.8”
Wei ht 3.8 k (8.4 lbs.) (includin mountin materials)
Aspect ratio 16:9
Resolution 1920 x 1080 pixels
Response time 5 ms (Gray-to- ray)
Connectors DVI
VGA
HDMI
Display port
1 port for monitor control (USB 3.0)
2–port USB hub (USB 3.0)
C13 power connector
Audio input connector: 3.5 mm
Headphone jack: 3.5 mm
Built in speakers 1.0 W + 1.0 W
12 Appendix A Tobii Pro Spectrum – Specifications Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US

Power supply 100-240 VAC 50/60 Hz
Power Maximum rated power consumption: 42 W
Typical power consumption: 13 W
Power Save Mode: 0.5 W
Power Mana ement: Power Save (VESA DPM, DisplayPort Rev
1.1a, and DVI DMPM)
A3 Certifications
A3.1 Compliance and Certification
The certification and compliance statements in this section are only valid for the eye tracker unit. For compliance and
certification of the monitor and external power supply, please see the separate compliance documentation of those.
Safety
Safety standards: IEC 60950-1:2005 (Second Edition) + Am 1:2009 + Am 2:2013
EN 60950-1:2006/A11:2009/A1:2010/A12:2011/A2:2013
UL 60950-1 Edition 2 +A1 +A2
CSA 60950-1 Edition 2 + A1 + A2
J60950-1(H22)
National differences for Australia to IEC 60950-1, 2nd Edition
National differences for Korea to IEC 60950-1, 2nd edition
IEC 62471:2006 (First Edition)
Certification and declaration
of conformance ETL Listed (US & Canada), CB Certificate, CE.
EMC
EMC standards: EN 55032: 2015, Class B
EN 55024: 2010 + A1
EN 61000-6-1: 2007
EN 61000-6-3: 2007 + A1
FCC 47 CFR Part 15 (2015): Class B
ICES-003 Issue 6: Class B
CISPR 32: 2015, Class B
CISPR 35: 2016
Certification and declaration
of conformance: FCC, CAN ICES-3 (B)/NMB-3(B), ACMA (RCM), CE.
See ETL and CB certificates for details.
Sustainability
Directives: RoHS Directive 2011/65/EU
REACH Directive EC 1907/2006
This product is exempt from CCC.
Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US Appendix A Tobii Pro Spectrum – Specifications 13

A4 Software Options
Software applications can be connected over TCP/IP (Ethernet connector) as clients to the eye tracker (e. . perform user
calibrations and ather eye aze data in real-time). Examples of applications include Pro Lab or any applications built on the Pro
SDK.
Pro Lab is a comprehensive research software platform for eye trackin desi ned to meet the hi hest demands on different
research scenarios with exact timin accuracy. This software offers an efficient workflow, makin it easy to desi n experiments,
record data, analyze and visualize eye trackin data, and to sync this data with other biometric data streams.
The Pro SDK offers a broad set of tools in order to make it simple to develop a niche applications or scripts across multiple
platforms, usin a wide ran e of pro rammin lan ua es. This SDK ives the researcher access to the full set of relevant aze
data streams, such as 3D eye coordinates, 3D and 2D aze coordinates, pupil data, etc.
Download links
• Tobii Pro Lab: http://www.tobiipro.com/product-listin /tobii-pro-lab/
• Tobii Pro SDK: http://www.tobiipro.com/product-listin /tobii-pro-sdk/
• Tobii Pro Eye Tracker Mana er: https://www.tobiipro.com/product-listin /eye-tracker-mana er/
The Pro Spectrum is not compatible with the Tobii Pro Analytics SDK version 3.0 or older or with Tobii Pro Studio.
14 Appendix A Tobii Pro Spectrum – Specifications Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US

Appendix B Reco ended onitor
The Pro Spectrum is supplied with a thorou hly tested and approved 23.8” 16:9 LCD monitor. Our recommendation is to use
this monitor, which has been tested for wei ht, dimension and center of ravity for the system set up with the eye tracker unit
and screen mountin solution. If you need to use a different monitor, we recommend that you choose a black monitor without
any colored décor elements and that the screen bezel is as slim/thin as possible. No connections or buttons should be located
underneath the monitor as this could interfere with the mountin of the eye tracker. The monitor must be equipped with a
standard 100 x 100 mm VESA mountin interface on the back and it should not wei h more than the supplied monitor.
The eye tracker has under one tippin tests with the supplied monitor attached. If you choose to use a different
monitor, we can not uarantee the safety of such a combination and you will use it at your own risk.
Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US Appendix B Recommended monitor 15

Appendix C Glossary
Binocular eye trackin Tracks and reports data for both left and ri ht eye.
Gaze precision Describes the spatial an ular variation between individual
and consecutive aze samples.
Gaze precision filtered Describes the spatial an ular variation between individual
and consecutive aze samples (Root Mean Square),
calculate after a smoothin filter has been applied to the raw
data - Savitzky A. and Golay, J.E., 1964. Smoothin and
Differentiation of Data by Simplified Least Squares
Procedure Savitzky-Golay. Anal. Chem., vol.36, pp. 1627-
1639. Filter settin s: Polynomial order 2, with a 20
millisecond samplin window.
Gaze accuracy Describes the an ular avera e distance from the actual aze
point to the one measured by the eye tracker.
Samplin rate Number of data samples per second. The Tobii Spectrum
eye trackers have a stable data-rate of 60, 120, 150, 300,
600 or 1200 Hz; that is 60, 120, 150, 300, 600 or 1200
data samples per second are collected for each eye.
Gaze data output frequency The number of data samples per second output for each eye.
Samplin variability Samplin variability specifies the maximum difference
between the stated samplin rate and the actual samplin
rate that can occur durin an eye trackin test.
Processin Latency Describes the time required by the eye tracker processor to
perform ima e processin and eye aze computations.
Total system latency This is the duration from the mid-point of the eye ima e
exposure, to when a sample is available via the API on the
client computer (assumin there is a dedicated Gi abit
Ethernet connection). It includes half of the ima e exposure
time, ima e read-out and transfer time, processin time and
the time to transfer the data sample to a client computer.
Timestamp precision as specified in each data sample This is the temporal deviation of the timestamp in the data
sample received by the client application. This includes any
offset in the clock sync between the eye tracker processin
unit and a typical client computer.
Blink recovery time (time to trackin recovery for blinks) When a subject blinks, the eye tracker loses the ability to
track eye aze because the eye is covered by the eyelid. If
the pupil is occluded for only a short period (a few hundred
milliseconds), the system will re ain trackin immediately
when the pupil becomes visible a ain, but only if the subject
has maintained approximately the same head position durin
the blink. Data durin blinks are only lost when the pupil is
occluded, (i.e. durin the eye lid movement itself or when the
eye is closed).
Gaze recovery time (time to trackin recovery after lost
trackin )
An eye tracker workin in a natural user environment may
occasionally lose track of the subject’s eyes, (e. ., when the
subject completely turns away from the tracker). If a period of
a few hundred milliseconds elapses durin which the eye
tracker is unable to detect the eyes in close proximity to
where they were last detected, the eye tracker will start
searchin for the eyes within the entire head movement box.
The stated measurement is the typical time to trackin
recovery in such a situation.
16 Appendix C Glossary Tobii Pro Spectrum Eye Tracker User’s manual v.2.0 - en-US