08 - VBOX 20SL Slip/Roll Angle Offsets
Slip Angle Offset
When using the VB20SL3 for measurement of Slip Angle, Pitch and/ or Roll Angle, True Heading, Lateral Velocity or
Yaw Rate, it is essential that the Slip Angle offset is determined before conducting tests. This then compensates for any
misalignment in the placement of Antennas A and B.
There are also many occasions when the antennas cannot be placed directly in line with the car, such as when an ‘off-
vehicle’ antenna is used to measure the Slip angle over a particular wheel.
Measuring Pitch Angle and Slip Angle
To measure Pitch angle accurately at the same time as Slip angle with Antennas A and B will require the antennas to be
aligned as close as possible to a line parallel to the longitudinal line of the car.
Setting the Slip Offset
The VB20SL3 includes a built-in facility for calculating and setting the offset. With the antennas placed suitably and the
antenna separation set correctly in the unit, enter the Setup Antenna configuration menu and select Slip offset ‘Calc.
Offset’. The unit will give instructions on its display screen to allow it to determine the offset.
First, the unit will instruct you to drive at a speed greater than 25 km/h. Once this is achieved, the unit will tell you to
drive straight, and will begin calculating the Slip Angle offset automatically. During the 5 second process, it is very
important that you keep the vehicle in a straight line and above 25 km/h. The Slip angle sensor beeps during this
calculation and then stops beeping when it has finished calculating the offset.
If required, the Slip Angle offset can be re-calculated at any time by repeating this procedure. Selecting the ‘Clear Offset’
option in the Configuration Screen will clear the current offset value.
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_VBOX_20SL_Slip%2F%2FRoll_Angle_Offsets
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