Tobii Pro Pro Spectrum User manual

Pro Spectrum
User Manual

Pro Spectrum User Manual
Version 2.1
11/2020
All rights reserved.
Copyright © Tobii Pro AB (publ)
The information contained in this document is proprietary to
Tobii Pro AB. Any reproduction in part or whole without prior written
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Content subject to change without notice.
Please visit Tobii Pro Connect for updated versions of this doc-
ument.

Pro Spectrum User Manual v2.1 3
Table of Contents
1 Introduction 5
1.1 Overview 5
1.2 Basic operating principles 5
1.3 Product versions 5
1.4 Additional software options 6
2 What's in the Pro Spectrum box 7
3 Safety 8
3.1 Mounting Warning 8
3.2 Emergency Warning 8
3.3 Infrared Warning 8
3.4 Epilepsy Warning 8
3.5 Child Safety 9
3.6 Do not open Tobii Pro Spectrum 9
3.7 Environment 9
4 Setup Tobii Pro Spectrum 10
4.1 Ventilation 10
4.2 Test environment 10
4.3 Mount the monitor to the eye tracker unit 10
4.4 Connect the eye tracker 11
4.4.1 Power on Tobii Pro Spectrum 12
4.5 Monitor settings 12
5 Display Settings 14
5.1 VESA mount 14
5.2 Scene camera mount 15
6 Tobii Pro Spectrum Configuration 16
6.1 Tobii Pro Eye Tracker Manager 16
6.2 Keep your eye tracker software and display setup updated 16
6.3 Upgrade and downgrade the eye tracker’s firmware 17
6.4 Configure Tobii Pro Spectrum in Tobii Pro Eye Tracker Manager 17
6.4.1 Change Tobii Pro Spectrum frequency setting 17
6.4.2 Configure Tobii Pro Spectrum for standalone use 18
7 Additional Features 19
7.1 User calibration for Tobii Pro Spectrum 19
7.1.1 Binocular calibration 19
7.1.2 Monocular calibration 19
7.2 Use the TTL input port for external event recording 20
7.3 Eye images 21
8 Product Care 22
8.1 Transportation and storage 22
8.2 Cleaning 22
8.3 Disinfection 22
8.4 Disposal of the eye tracker 22
8.5 Limitation of liability 22

Pro Spectrum User Manual v2.1 4
9 Technical Specifications 23
9.1 Eye tracking specifications 23
9.2 Setup 24
9.3 Software compatibility 25
9.4 Hardware versions 25
9.5 Pro Spectrum eye tracker specifications 25
10 Compliance Information 27
Appendix A Recommended monitor 29
Appendix B Support, Learning Center, and Warranty 30
B1 CustomerSupport 30
B1.1 Get help online 30
B2 Learning Center 30
B3 Warranty information 30
Appendix C Limitations and considerations 31
C1 Intended use 31
C2 Light conditions 31
C3 Eyelashes 31
C4 Droopy eyelids 31
Appendix D Glossary 32

Pro Spectrum User Manual v2.1 5
1 Introduction
1.1 Overview
This user manual describes the features and functionalities of the Tobii Pro Spectrum eye
tracker. Pro Spectrum can be used in various setups, either with an attached monitor or as a
standalone unit, to perform eye tracking with physical objects. The typical setup is having Pro
Spectrum connected to a PC running Pro Lab, see the image below.
The design enables the subject to move naturally during recording while still achieving high accuracy
and precision.
1.2 Basic operating principles
Tobii Pro Spectrum use infrared illuminators to generate reflection patterns on the corneas of the
subject’s eyes. These patterns, plus other visual data about the subject, are collected by image
sensors. Sophisticated image-processing algorithms identify relevant features, including the eyes
and the corneal reflection patterns. Complex mathematics is used to calculate the 3D position of
each eyeball and the gaze point on the screen (or when a screen isn’t used, for the gaze point on
the object); in plain words, it tells you where the subject is looking.
Eye trackers from Tobii Pro are designed for use in indoor office environments and for
tracking on humans.
1.3 Product versions
Tobii Pro Spectrum is available in four product versions: 1200 Hz, 600 Hz, 300 Hz and 150 Hz.
The values denote the eye tracker’s maximum sampling frequency, but it can be used at lower set-
tings as well. The 600 Hz, 300 Hz and 150 Hz versions can be upgraded to a faster version. For
more information, contact your sales representative or visit tobiipro.com.

Pro Spectrum User Manual v2.1 6
1.4 Additional software options
Pro Lab
tobiipro.com/product-listing/tobii-pro-lab/
Pro Lab is a comprehensive research software platform
for eye tracking designed to meet the highest demands
on different research scenarios with exact timing accur-
acy. This software offers an efficient workflow, making
it easy to design experiments, record data, analyze and
visualize eye tracking data, and to sync this data with
other biometric data streams.
Pro SDK
tobiipro.com/product-listing/tobii-pro-sdk/
Pro SDK offers a broad set of tools that makes it simple
to develop a variety of niche applications or scripts
across multiple platforms, using a wide range of pro-
gramming languages. This SDK gives the researcher
access to the full set of relevant gaze data streams,
such as 3D eye coordinates, raw data, pupil data, etc.
Third-party software This term refers to any application built on Pro SDK.

Pro Spectrum User Manual v2.1 7
2 What's in the Pro Spectrum box
A. Angle meter I. USB cable for connection between the PC
and the monitor’s integrated USB hub
B. Measuring tape J. Cold shoe for mounting 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. Cleaning cloth
F. Monitor mounting bracket N. Fabric cord sleeve for collecting the cables
G. Power cables for eye tracker (UK, US,
EU and Aus/ China)
O. Ethernet cable
H. Power adaptor for eye tracker

Pro Spectrum User Manual v2.1 8
3 Safety
3.1 Mounting Warning
Tobii Pro Spectrum should be mounted according to the instructions of the approved
mounts used. Tobii Pro AB or its agents are not liable for damage or injuries to a person
or its property due to Pro Spectrum falling from a mounted configuration. The mounting
of Pro Spectrum is done entirely at the user’s own risk.
3.2 Emergency Warning
Tobii Pro Spectrum is to be used for research purposes only. Be aware that due to the
low, but possible risk of failure or distraction, Pro Spectrum should not be relied upon or
used in dangerous or otherwise critical situations.
3.3 Infrared Warning
When activated, Tobii Pro Spectrum emits pulsed infrared (IR) light. Certain medical
devices are susceptible to disturbance by IR light and/or radiation. Do not use Pro Spec-
trum when in the vicinity of such susceptible medical devices as their accuracy or proper
functionality could be inhibited.
3.4 Epilepsy Warning
Some people with photosensitive epilepsy are susceptible to epileptic seizures or loss of
consciousness when exposed to certain flashing lights or light patterns in everyday life.
This may happen even if the person has no medical history of epilepsy or has never had
any epileptic seizures.
A person with photosensitive epilepsy would also be likely to have problems with TV
screens, some arcade games, and flickering fluorescent bulbs. Such people may have a
seizure while watching certain images or patterns on a monitor, or even when exposed to
the light sources of an eye tracker. It is estimated that about 3-5% of people with epilepsy
have this type of photosensitive epilepsy. Many people with photosensitive epilepsy
experience an “aura” or feel odd sensations before the seizure occurs. If you feel odd dur-
ing use, move your eyes away from the eye tracker.

Pro Spectrum User Manual v2.1 9
3.5 Child Safety
Tobii Pro Spectrum is an advanced computer system and electronic device. As such it is
composed of numerous separate, assembled parts. In the hands of a child certain of
these parts have the possibility of being separated from the device, possibly constituting a
choking hazard or another danger to the child.
Young children should not have access to, or use, the device without parental or guard-
ian supervision.
3.6 Do not open Tobii Pro Spectrum
Non-compliance will result in loss of Warranty! There are no user serviceable com-
ponents inside. Contact Tobii Pro Support if your Tobii Pro Spectrum is not working prop-
erly.
3.7 Environment
Tobii Pro Spectrum is designed for use in dry indoor environments. Avoid any exposure
to direct sunlight as this will affect eye tracking quality and longer exposure can overheat
the equipment. Avoid exposure to any liquids, gels, moist, rain, sweat or other damp
materials or environments. Do not use the eye tracker near water – the device is not water
resistant.
Keep the eye tracker in a clean and dust free environment. When using the equipment
take adequate precautions against dust and dirt.
Do not place or use the equipment in places subject to extreme temperatures and humid-
ity, such as on top of and or near a heating element, in a hot or damp room, or in a hot
automobile in the sun.

Pro Spectrum User Manual v2.1 10
4 Setup Tobii Pro Spectrum
4.1 Ventilation
As with most electronic devices, Pro Spectrum generates heat during 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 overheating.
4.2 Test environment
Tobii Pro Spectrum is best kept in dry conditions at room temperature. The recommended range
for temperature and humidity during operation is as follows:
lTemperature: 15°C to 30°C (59°F to 86°F)
lHumidity: Max 20% to 95% (no condensation on the device)
4.3 Mount the monitor to the eye tracker unit
Tobii Pro Spectrum is delivered with the monitor already mounted. If this for any reason is not the
case, e.g. someone has been using the unit as a standalone eye tracker, you need to reattach the
monitor to the base. You mount and remove the monitor swiftly thanks to its one-screw fastening.
Procedure for affixing the mounting bracket:

Pro Spectrum User Manual v2.1 11
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 mounting bracket into the slot on the
top of the eye tracker.
3. When the lower end of the mounting bracket is fully inserted into the slot, gently tilt the screen
forward.
4. When the mounting bracket is in place, secure it by pushing the lock knob downwards and
turning it until it is firmly in place.
If you need to remove the monitor, repeat the above steps in the reverse order.
4.4 Connect the eye tracker
Tobii Pro Spectrum is connected to a standard Ethernet network with a RJ–45
connector. Procedure for attaching the power supply:
1. Attach the supplied Ethernet cable to the corresponding 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 pos-
sible to connect the eye tracker to a switch connected to your LAN.
3. Attach the supplied power adapter cable to the corresponding outlet on the eye tracker.
a. Choose the power cord with the power plug suited for the electrical outlet and connect the
other end to the AC adapter.
b. If neither of the power plugs suits your needs, please contact your sales representative or

Pro Spectrum User Manual v2.1 12
Tobii Pro Support for assistance.
c. Insert the power cord plug to a mains power outlet.
4.4.1 Power on Tobii Pro Spectrum
Tobii Pro Spectrum power switch is located on its back side. We recommend that you shut off the
unit after the workday or for longer periods of inactivity.
During startup, the illuminators in the front of Pro Spectrum, lit up one by one to indicate that the
LED-hardware is OK.
Approximately 20 seconds after you power on, a short beep is heard, indicating that the processor
module has loaded the BIOS and now begins to load the operating system.
After another 20 seconds two long beeps are heard, indicating that the system is ready for use.
If anything goes wrong (no matter the cause), you hear three short beeps about 40 to 50 seconds
after the powering-on sequence, followed by a short pause and then another three short beeps.
You turn off the eye tracker by pressing the power switch. During shut down, the power switch
indicator lamp flashes. Depending on the unit’s internal state, powering down can take up to 20
seconds.
You can force a shutdown of Pro Spectrum by pressing the power switch for at least 5
seconds.
4.5 Monitor settings
Tobii Pro Spectrum is supplied with a pre-mounted 23.8” monitor.
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 starting the
monitor with the ON/OFF switch.

Pro Spectrum User Manual v2.1 13
1. Attach the supplied Display Port or HDMI cable to the corresponding connector on your com-
puter.
It is possible to use any of the other display interfaces on the monitor as well.
However, for the best performance we recommend Display Port or HDMI, depend-
ing on what your PC is equipped for.
2. Choose the power cable with the plug suited for the wall outlet and connect the other end to
the corresponding outlet on the monitor.
3. Insert the power cable plug to a power outlet.
4. If neither of the plugs work with your power outlet, please contact your sales representative or
Tobii Pro Support for assistance.

Pro Spectrum User Manual v2.1 14
5 Display Settings
1. Pro Spectrum as delivered with the monitor mounted on the eye tracker.
2. Pro Spectrum as a standalone eye tracker without monitor.
3. Eye tracker and monitor together on a VESA 100x100 mount.
4. Standalone with monitor.
You can use the eye tracker with another monitor, but that is not recommended.
For more information, read Recommended monitor.
5.1 VESA mount
Tobii Pro Spectrum can be mounted on a standard VESA 100x100 mount.
Here's what to do:
1. Remove the stand by unscrewing the two screws from the underside (see image below).
2. Fold the two legs upwards so they lie neat against the eye tracker’s side panels (as in setup 3
in the Setup Options-image 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.

Pro Spectrum User Manual v2.1 15
5.2 Scene camera mount
Beneath the eye tracker there is a mount used for attaching a scene camera (purchased
separately).
Here's what to do:
1. Attach the enclosed mounting bracket to your camera unit.
2. Slide the assembly into the scene camera mount and tighten the screw.

Pro Spectrum User Manual v2.1 16
6 Tobii Pro Spectrum Configuration
Tobii Pro Spectrum is configured via Tobii Pro Eye Tracker Manager.
6.1 Tobii Pro Eye Tracker Manager
Tobii Pro Eye Tracker Manager is free software available on Tobii Pro Connect.
Pro Eye Tracker Manager helps you manage your Tobii Pro eye tracker. It lets you see which eye
tracker firmware and software versions you are running and also facilitates updates (where applic-
able). It provides:
lDrivers and Firmware installation or updates
lDisplay setup
lPositioning guide
lUser calibration
lGaze visualization*
*Gaze visualization in Pro Eye Tracker Manager lets you quickly evaluate the quality of the eye track-
ing data. The Gaze visualization overlaps data only on the Pro Eye Tracker Manager screen while
Pro Eye Tracker Manager is open.
References in product documentation to Tobii Pro Eye Tracker Manager refer to the
latest version available on Tobii Pro’s website.
6.2 Keep your eye tracker software and display setup updated
Updates
From time to time, Tobii Pro releases updates for an eye tracker’s applicable driver and firmware in
order to improve performance and/or introduce new functionalities. Please check the Tobii Pro
website regularly for news and information about updates about your eye tracker. We recommend
that you activate updates and notifications in Tobii Pro Eye Tracker Manager.
How to activate notifications and updates in Pro Eye Tracker Manager:
1. Click to expand the drop-down list at the top of Pro Eye Tracker Manager.
2. Toggle the switches for notifications. Orange means they are activated.
3. If a software update is available, the available update has a clickable orange link.
4. Select an interface language. The default is English.
Display setup updates
Use Pro Eye Tracker Manager whenever you change computers or display setups.

Pro Spectrum User Manual v2.1 17
6.3 Upgrade and downgrade the eye tracker’s firmware
You can determine which firmware version your connected Tobii Pro Spectrum uses by reading
the details on the displayed card with your eye tracker’s name in Tobii Pro Eye Tracker Manager.
Firmware versions are listed on the Drivers & Firmware tab.
You can upgrade or downgrade the firmware by resetting the eye tracker to factory defaults and
then reinstalling the desired firmware version.
Downgrading:
1. Turn on the eye tracker and confirm that it appears in Pro Eye Tracker Manager.
2. Restart Pro Spectrum by inserting a pointy device (i.e. a straightened paper clip) into the
recessed reset button hole, located between the power connector and the data port on the
connector panel at the back of the eye tracker. Keep pressing the reset button till you hear a
beep.
3. Pro Spectrum eye tracker restarts one or more times. This is not an error. After a while, your
eye tracker appears in Pro Eye Tracker Manager again.
4. On the Drivers & Firmware tab in Pro Eye Tracker Manager, select the desired firmware ver-
sion from the list and click the Install button.
Upgrading:
1. Turn on the eye tracker and confirm that it appears in Pro Eye Tracker Manager.
2. On the Drivers & Firmware tab in Pro Eye Tracker Manager, select the desired firmware ver-
sion from the list and click the Install button.
6.4 Configure Tobii Pro Spectrum in Tobii Pro Eye Tracker Manager
In Pro Eye Tracker Manager you can change some settings for your Pro Spectrum. For instance,
you can create and recall setups for using the eye tracker in standalone mode and change the eye
tracker’s frequency.
6.4.1 Change Tobii Pro Spectrum frequency setting
1. Start Tobii Pro Eye Tracker Manager. Tobii Pro Spectrum will displays as a “card” in the list of
available eye trackers at the top.
2. Select Pro Spectrum by clicking on it.
3. On the Drivers & Firmware tab, you can select the desired frequency setting from the drop-
down list.
Option with reduced infrared light: If you change the sampling frequency to 60 or 120 Hz,
you reduce the brightness of the infrared light from the eye tracker. This is useful when
you want a highly unobtrusive setup for the participant. This low visibility option is only
available for 60 and 120 Hz.

Pro Spectrum User Manual v2.1 18
6.4.2 Configure Tobii Pro Spectrum for standalone use
1. Start Tobii Pro Eye Tracker Manager on your computer. All available eye trackers appear in
the “Connected Eye Trackers" pane.
2. Select Pro Spectrum by clicking on it.
3. On the Overview tab, locate Display Setup and click the ellipsis button to the right. On the
drop-down menu, click New.
4. Follow the instructions in each configuration step, including naming your new setup.
5. When finished, your new setup appears in the drop-down list of display setups.
6. To confirm that Pro Spectrum can detect the participant’s eyes, enable the Position Guide at
the bottom left of Pro Eye Tracker Manager. Once activated, you should be able to see two
circles in a face contour.

Pro Spectrum User Manual v2.1 19
7 Additional Features
7.1 User calibration for Tobii Pro Spectrum
Tobii Pro Spectrum calibration procedure allows for robust eye tracking research by facilitating
workflows that take into consideration your research questions, as well as the characteristics of
your participant.
Pro Spectrum supports:
lBinocular calibration
lMonocular calibration
7.1.1 Binocular calibration
The binocular calibration is successful if enough data has been collected to successfully calibrate
both eyes. Calibration results are presented for all the points in which data has successfully been
collected for both eyes. To improve a calibration, you can redo the entire calibration or recalibrate
the points for which data is missing or not good enough for your research. This is an efficient and
powerful method to calibrate your participant’s eyes, suitable for most research questions and for
most participants.
Available in:
lTobii Pro Lab, when selecting the Calibration stimuli in the Design Timeline
lTobii Pro SDK, when using screen-based calibration class/methods
7.1.2 Monocular calibration
Tobii Pro Spectrum’s monocular calibration functionality lets you to collect eye tracking data optim-
ized for each of the eyes of the participant. Pro Spectrum can robustly identify the left and right
eyes, irrespective if only one eye or both are visible to the eye tracking sensors. For increased con-
fidence in some cases, you could choose to cover the eye that is not tracked, but this is not
required.
This functionality is useful if one eye causes the binocular calibration process to fail. This could
happen, for example, due to severe strabismus, or if one eye is a prosthetic.
Separate calibration for the two eyes is also useful for research into binocular coordination and fix-
ation disparity, or in situations where you would like the calibration to pass even if only one eye
could be tracked.
Note that a default calibration is used for the eye that was not selected for calibration or that has
failed to calibrate. During the recording, Pro Spectrum will continue to search for both eyes
because it is less likely to find data for the uncalibrated eye. Nevertheless, Pro Spectrum will
report the data for the uncalibrated eye when available.
Pro Spectrum allows for two types of monocular calibration:
lBoth eyes
lOnly one eye – left or right

Pro Spectrum User Manual v2.1 20
Depending on how the calibration flow is implemented in the software, you can choose to perform
a calibration for both eyes at a time; calibrate only one eye – left or right; or calibrate first one eye,
and then the other.
Calibrating both eyes at a time:
Using the Monocular calibration functionality provides more granularity for your calibration results,
reporting on whether the participant’s left, right or both eyes have been successfully calibrated.
Results will be presented for each point. In this case you can successfully calibrate even if only
one eye was correctly calibrated. You can improve a successful calibration by redoing the cal-
ibration, or by selecting to calibrate first one eye and then the other. In this case one can suc-
cessfully calibrate even if only one eye was successfully calibrated. One can improve a successful
calibration by redoing the calibration, or by selecting to calibrate only one eye, and then the other.
Calibrating only one eye at a time:
Using the Monocular calibration functionality lets you calibrate only one of your participant´s eyes,
while ignoring the other eye. In this case, a calibration is successful if enough data has been col-
lected for the eye of interest and the other eye is ignored. The calibration results report how good
the calibration was for the eye of interest. If the data is not good enough for your research, you can
improve a calibration by redoing the entire calibration or recalibrating the points with missing data
for the eye of interest. Proceed with calibrating the other eye if desired.
Available in:
lTobii Pro Eye Tracker Manager, when selecting Calibration mode you can choose between:
Both eyes, Right eye or Left eye
lTobii Pro SDK, when using Screen based Monocular calibration class/methods
For more information on how to calibrate Tobii Pro Spectrum using Tobii Pro Eye Tracker Man-
ager, read the Learn article, Performing a monocular calibration with the Tobii Pro Spectrum.
For more information on the Binocular and Monocular calibration using Tobii Pro SDK, visit
developer.tobii.com.
7.2 Use the TTL input port for external event recording
Tobii Pro Spectrum is equipped with a digital data input port that records events in up to eight parallel
TTL signals. The events are recorded with a timestamp accuracy better than 50 µs. The detected
events are available in decimal format (0–255) through either Pro Lab or Pro SDK. The TTL signal
can be combined to obtain up to 256 different events.
Any digital signal source fulfilling the electrical specification can be connected to the tracker, for
example the Cedrus Stimtracker.
Interface: 8-bit parallell TTL input (DBc9)
TTL levels: Vin <0,8 V=>; Vin > 2 V => Logical 1
Pinning: pin 1-8: inputs; pin 9: GND
Input voltage interval: 0-5 V
Connector shielding: connect to system chassis ground