2
l
Y-axis gyro (rad/s)
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Z-axis gyro (rad/s)
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Altitude (m)
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Angle (°)
Acceleration
There are six acceleration channels, measured by two different chips, which are
located under the 3-axis icon on the sensor label. The icon shows the positive
direction for each axis, with the x-direction of acceleration parallel to the length
of the sensor and the z-direction straight up through the label. Each direction of
acceleration can be measured separately.
If you choose to activate three acceleration channels from one chip at once, you
can create a calculated column for the total acceleration magnitude.
Gyroscope
Use the gyroscope channels to measure the rotation rate of the unit. Measured
values are positive when the rotation is counter-clockwise relative to the axis
directions indicated by the 3-axis icon on the label. For example, when placed
label upward on a turntable rotating clockwise, the x- and y- gyroscopes will
read close to zero and the z- gyroscope will show a negative reading.
If you choose to activate all three gyroscope channels at once, you can create a
calculated column for the total magnitude of angular velocity.
Altitude
The altimeter channel measures altitude with a range of –1800 m to 10,000 m.
Zero the altimeter before use to measure relative height above and below your
zero level.
Angle
The angle measurement channel uses the ±16
g
accelerometer chip and
trigonometry to calculate the angle of the x-direction axis relative to horizontal.
If you set the sensor flat on a horizontal surface with the Angle channel turned
on, the green "level" LED,
, will glow to indicate 0° (horizontal) or 90°
(vertical) inclination.
Videos
View videos related to this product at
www.vernier.com/gdx-acc
Calibrating the Sensor
Acceleration
In most cases, calibration is not necessary for this sensor. However, most
accelerometers, including this one, sense gravity as well as acceleration. Thus, if
you want to measure vertical acceleration separate from gravity, simply place
the sensor in its measurement orientation and zero the axis that is pointing
vertically upward.
If you plan to use this sensor exclusively for vertical acceleration, it makes sense
to calibrate the sensor so that zeroing will not be necessary every time a new
Connecting the Sensor
See the following link for up-to-date connection information:
www.vernier.com/start/gdx-acc
Connecting via Bluetooth
Ready to connect
Red LED next to Bluetooth icon flashes when
sensor is awake and ready to connect.
Connected
Green LED next to Bluetooth icon flashes when
sensor is connected via Bluetooth.
Connecting via USB
Connected and charging
Orange LED next to battery icon is solid when
sensor is connected to Graphical Analysis via
USB and the unit is charging. LED next to
Bluetooth icon is off.
Connected, fully charged
Green LED next to battery icon is solid when
sensor is connect to Graphical Analysis via USB
and fully charged. LED next to Bluetooth icon is
off.
Charging via USB,
connected via Bluetooth
Orange LED next to battery icon is solid when
sensor is connected to charger via USB and the
unit is charging. Green LED next to Bluetooth
icon flashes when sensor is connected via
Bluetooth.
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 Acceleration has 11 measurement channels:
l
X-axis acceleration (m/s
2
)
l
Y-axis acceleration (m/s
2
)
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Z-axis acceleration (m/s
2
)
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X-axis acceleration - high (m/s
2
)
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Y-axis acceleration - high (m/s
2
)
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Z-axis acceleration - high (m/s
2
)
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X-axis gyro (rad/s)