Juniper Systems Allegro 2 User Guide - Manual (Page 47)

Ch 3 Programs and Settings 43
Sensors Control Panel
The Sensors control panel lets you see the compass and
accelerometer working, set the magnetic declination
angle, and calibrate the sensors. Select Start > Settings >
System > Sensors.
„
The Magnetic Declination angle is the difference
between True North and magnetic North. Applications
that are using True North use this value to adjust the
readings from the compass.
„
To calibrate the compass, select Calibrate Compass.
Rotate the handheld around all three axis several times in
every orientation possible (for at least 10 seconds). Press
Stop when you are done. Calibrating the compass is
very important and needs to be done often. Changes in
environment, added attachments to the handheld, and
mounting options can affect the sensor readings. If you
are mounting the handheld to a pole, mount it first and
then calibrate the compass.
„
When the accelerometer is calibrated, you are telling the
handheld that this is level, remember this. It is important
that the handheld is laying on its back on a level
surface. When the handheld is level, select Calibrate
Accelerometer, and then Start. Samples are averaged
over the next five seconds and the result is saved. The
accelerometer only needs to be calibrated once. (If you
restore the handheld to its original factory defaults, you
need to calibrate the accelerometer again.)