Vernier Go Direct GDX-RMS User manual

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The sensor also has a set of accessory mounting holes that allow it to connect to
existing accessories such as the Polarizer Analyzer (PAK-OEK) and the Rotary
Motion Motor Kit (MK-RMV).
Getting Started
Please see the following link for platform-specific connection information:
www.vernier.com/start/gdx-rms
Bluetooth Connection USB Connection
1. Install Vernier Graphical
Analysis™ on your computer,
Chromebook™, or mobile device. If
using LabQuest®, make sure
LabQuest App is up to date. See
www.vernier.com/ga4 for Graphical
Analysis availability or
www.vernier.com/downloads to
update LabQuest App.
2. Charge your sensor for at least
2hours before first use.
3. Turn on your sensor by pressing the
power button once. The Bluetooth®
LED will blink red.
4. Launch Graphical Analysis or turn
on LabQuest.
5. If using Graphical Analysis, click
or tap Sensor Data Collection. If
using LabQuest, choose Wireless
Device Setup > Go Direct from the
Sensors menu.
6. Select your Go Direct sensor from
the list of Discovered Wireless
Devices. Your sensor's ID is located
near the barcode on the sensor. The
Bluetooth LED will blink green
when it is successfully connected.
7. Click or tap Done. You are now
ready to collect data.
1. If using a computer or
Chromebook, install Vernier
Graphical Analysis. If using
LabQuest, make sure LabQuest
App is up to date. See
www.vernier.com/ga4 for Graphical
Analysis availability or
www.vernier.com/downloads to
update LabQuest App.
2. Connect the sensor to the USB
port.
3. Launch Graphical Analysis or turn
on LabQuest. You are now ready to
collect data.
4. This is a multi-channel sensor. To
change the channel selections, see
www.vernier.com/start/gdx-rms
Note: This sensor does not work with
the original LabQuest. It works with
LabQuest 2 or LabQuest 3.
Go Direct®
RotaryMotion
(Order Code GDX-RMS)
Go Direct Rotary Motion is a bidirectional angle
sensor designed to measure rotational or linear
position, velocity and acceleration. It is used for a variety of applications,
including
lDetermining rotational inertia
lInvestigating angular motion applications of Newton's second law
lInvestigating conservation of angular momentum
lVerifying Malus's law
lStudying the motion a physical pendulum
lMeasuring linear position for experiments such as the inverse square law of
light
Note: Vernier products are designed for educational use. Our products are not
designed nor are they recommended for any industrial, medical, or commercial
process such as life support, patient diagnosis, control of a manufacturing
process, or industrial testing of any kind.
What's Included
lGo Direct Rotary Motion
lMicro USBCable
lThumb screw
l3-step pulley and mounting screw
lO-ring
Compatible Software
See www.vernier.com/manuals/gdx-rms for a list of software compatible with the
Go Direct Rotary Motion.
Assembly
The 3-step pulley can be mounted on the rotating shaft in either of two
orientations: with the wide side of the pulley near the sensor body, or with the
narrow side of the pulley near the sensor body. The easiest way to insert the
3-step pulley on the Rotary Motion Sensor shaft is hold the shaft to prevent
rotation as you turn the pulley to align the key to the slot. The O-ring can be
slipped over the outer pulley to increase friction when the pulley is in contact
with a surface.
The thumb screw can be threaded into the back of the sensor allowing the
Rotary Motion Sensor to be attached to a ring stand.

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Connecting via USB
Connected and charging Orange LED next to the battery icon is solid
when the sensor is connected to Graphical Ana-
lysis via USB and the unit is charging. LED next
to Bluetooth icon is off.
Connected, fully charged Green LED next to the battery icon is solid
when the sensor is connected to Graphical Ana-
lysis via USB and fully charged. LED next to
Bluetooth icon is off.
Charging via USB,
connected via Bluetooth
Orange LED next to the battery icon is solid
when the sensor is charging. Green LED next to
the Bluetooth icon flashes.
Identifying the Sensor
When two or more sensors are connected, the sensors can be identified by
tapping or clicking Identify in Sensor Information.
Using the Product
Connect the sensor following the steps in the Getting Started section of the user
manual.
Channels
Go Direct Rotary Motion has two channels:
lAngle
lAngle (×4)
Angle
Angle is a default channel that is active when the sensor is connected. Angle
provides precision to 1° of rotation.
Angle (×4)
Angle (x4) can be selected to take advantage of the quadrature encoder. This
increases the precision to 0.25° of rotation.
8. This is a multi-channel sensor. To
change the channel selections, see
www.vernier.com/start/gdx-rms
Charging the Sensor
Connect the Go Direct Rotary Motion to the included USB Charging Cable and
any USB device for two hours.
You can also charge up to eight Go Direct Rotary Motion Sensors using our
GoDirect Charge Station, sold separately (order code: GDX-CRG). An LED on
each Go Direct Rotary Motion indicates charging status.
Charging Orange LED next to the battery icon is solid
while the sensor is charging.
Fully charged Green LED next to the battery icon is solid
when the sensor is fully charged.
Powering the Sensor
Turning on the sensor Press button once. Red LED indicator next to the
Bluetooth icon flashes when the unit is on.
Putting the sensor in
sleep mode
Press and hold button for more than three seconds
to put into sleep mode. Red LED indicator next to
Bluetooth icon stops flashing when sleeping.
Connecting the Sensor
See the following link for up-to-date connection information:
www.vernier.com/start/gdx-rms
Connecting via Bluetooth
Ready to connect Red LED next to the Bluetooth icon flashes
when sensor is awake and ready to connect.
Connected Green LED next to the Bluetooth icon flashes
when sensor is connected via Bluetooth.

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before attempting to use the device again. Do not attempt to dry using an
external heat source.
How the Sensor Works
The Go Direct Rotary Motion uses a quadrature optical (incremental type)
encoder to measure the amount and direction of rotation. The encoder, which is
attached to the rotating sensor shaft, consists of a coded pattern of opaque and
transparent sectors. The quadrature encoder produces two pulse output patterns
90° apart in phase. The position of the shaft is determined by counting the
pulses. The phase relationship between the output signals determines the
direction of rotation.
Troubleshooting
For troubleshooting and FAQs, see www.vernier.com/til/4051
Repair Information
If you have watched followed the troubleshooting steps and are still having
trouble with your Go Direct Rotary Motion, contact Vernier Technical Support
at [e-mail] or call 888-837-6437. Support specialists will work
with you to determine if the unit needs to be sent in for repair. At that time, a
Return Merchandise Authorization (RMA) number will be issued and
instructions will be communicated on how to return the unit for repair.
Accessories/Replacements
Item Order Code
Rotational Motion Accessory Kit AK-RMV
Rotary Motion Motor Kit MK-RMV
Micro USB Cable CB-USB-MICRO
USB-C to Micro USBCable CB-USB-C-MICRO
Go Direct 300 mAh Replacement Battery GDX-BAT-300
Warranty
Warranty information for this product can be found on the Support tab at
www.vernier.com/gdx-rms
General warranty information can be found at www.vernier.com/warranty
Disposal
When disposing of this electronic product, do not treat it as household waste. Its
disposal is subject to regulations that vary by country and region. This item
should be given to an applicable collection point for the recycling of electrical
and electronic equipment. By ensuring that this product is disposed of correctly,
you help prevent potential negative consequences on human health or on the
environment. The recycling of materials will help to conserve natural resources.
For more detailed information about recycling this product, contact your local
city office or your disposal service.
Specifications
Resolution 1° or 0.25°
Note: High resolution mode is also known as ×4 mode. When
active, the sensor has a 0.25 degree resolution and a limited
maximum measurable rotational velocity.
Optical
encoder
Bidirectional, quadrature encoder, 360 cycle per revolution
Maximum
speed
30 rev/s at 1° resolution
7.5 rev/s at 0.25° resolution
3-step
pulley
10 mm, 29 mm, and 48 mm groove diameter
Battery 300 mA Li-Poly
Battery life
(single full
charge)
~24 hours
Battery life
(long term)
~500 full charge cycles (several years depending on usage)
Care and Maintenance
Battery Information
The Go Direct Rotary Motion contains a small lithium-ion battery. The system
is designed to consume very little power and not put heavy demands on the
battery. Although the battery is warranted for one year, the expected battery life
should be several years. Replacement batteries are available from Vernier (order
code: GDX-BAT-300).
Storage and Maintenance
To store the Go Direct Rotary Motion for extended periods of time, put the
device in sleep mode by holding the button down for at least three seconds. The
red LED will stop flashing to show that the unit is in sleep mode. Over several
months, the battery will discharge but will not be damaged. After such storage,
charge the device for a few hours, and the unit will be ready to go.
Exposing the battery to temperatures over 35°C (95°F) will reduce its lifespan. If
possible, store the device in an area that is not exposed to temperature extremes.
Water Resistance
The Go Direct Rotary Motion is not water resistant and should never be
immersed in water.
If water gets into the device, immediately power the unit down (press and hold
the power button for more than three seconds). Disconnect the sensor and
charging cable, and remove the battery. Allow the device to dry thoroughly

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Vernier Software & Technology
13979 SW Millikan Way • Beaverton, OR 97005-2886
Toll Free [phone] • [phone] • Fax [phone]
[e-mail] • www.vernier.com
Rev. 3/16/2021
Go Direct, Vernier Graphical Analysis, LabQuest, and other marks shown are our trademarks or registered
trademarks in the United States. All other marks not owned by us that appear herein are the property of their
respective owners, who may or may not be affiliated with, connected to, or sponsored by us.
The Bluetooth®word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and any use of
such marks by Vernier Software & Technology is under license. Other trademarks and trade names are those of
their respective owners.
Battery recycling information is available at www.call2recycle.org
Do not puncture or expose the battery to excessive heat or flame.
The symbol, shown here, indicates that this product must not be disposed of
in a standard waste container.
Federal Communication Commission Interference Statement
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
FCC Caution
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference and
(2) this device must accept any interference received, including interference that may cause undesired operation
RF Exposure Warning
The equipment complies with RF exposure limits set forth for an uncontrolled environment. The antenna(s) used for this transmitter must
not be co-located or operating in conjunction with any other antenna or transmitter. You are cautioned that changes or modifications not
expressly approved by the party responsible for compliance could void your authority to operate the equipment.
IC Statement
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions:
(1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause undesired operation of the device.
Industry Canada - Class B This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus
as set out in the interference-causing equipment standard entitled “Digital Apparatus,” ICES-003 of Industry Canada. Operation is subject
to the following two conditions: (1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause undesired operation of the device.
To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically
radiated power (e.i.r.p.) is not more than that permitted for successful communication.
RF exposure warning: The equipment complies with RF exposure limits set forth for an uncontrolled environment. The antenna(s) used
for this transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence. L’exploitation est
autorisée aux deux conditions suivantes :
(1) l’appareil ne doit pas produire de brouillage, et
(2) l’appareil doit accepter tout interférence radioélectrique, même si cela résulte à un brouillage susceptible d’en compromettre le
fonctionnement.
Cet appareil numérique respecte les limites de bruits radioélectriques applicables aux appareils numériques de Classe B prescrites dans
la norme sur le matériel interférant-brouilleur: “Appareils Numériques,” NMB-003 édictée par industrie Canada. L’utilisation est soumise
aux deux conditions suivantes:
(1) cet appareil ne peut causer d’interférences, et
(2) cet appareil doit accepter toutes interférences, y comprises celles susceptibles de provoquer un disfonctionnement du dispositif.
Afin de réduire les interférences radio potentielles pour les autres utilisateurs, le type d’antenne et son gain doivent être choisie de telle
façon que l’équivalent de puissance isotrope émis (e.i.r.p) n’est pas plus grand que celui permis pour une communication établie.
Avertissement d’exposition RF: L’équipement est conforme aux limites d’exposition aux RF établies pour un environnement non
supervisé. L’antenne (s) utilisée pour ce transmetteur ne doit pas être jumelés ou fonctionner en conjonction avec toute autre antenne ou
transmetteur.
Note: This product is a sensitive measurement device. For best results, use the cables that were provided. Keep the device away from
electromagnetic noise sources, such as microwaves, monitors, electric motors, and appliances.