DAVIS DriveRight 130AL Manual (8140) - Manual (Page 10)

Page 8
C ALIBRATING THE D RIVE R IGHT 130AL
You must calibrate the unit before it will report the correct speed and acceleration.
Calibration adjusts the unit to work properly with your vehicle’s differential and tire
size.
NOTE: You should calibrate the unit whenever you change tires.
Calibrating the unit may be accomplished in one of two ways: using either the
odometer or the speedometer as the basis for calibration. When calibrating the
DriveRight,
always begin by obtaining a rough calibration of the unit using the
speedometer. Even if you plan to calibrate the unit using the odometer, first cali-
brate using the speedometer. Otherwise, the uncalibrated distance reading may
differ from your odometer reading so much that it will take too long to make the
numbers match.
Calibration Using the Speedometer
In order to calibrate using the speedometer, you must drive steadily at 25 MPH
(40 km/h) and press a button on the DriveRight 130AL. The DriveRight
130AL bases its calibration on the speed of the vehicle at the moment of calibra-
tion which it assumes to be 25 MPH (40 km/h).
NOTE: Because of the nature of this calibration procedure, we strongly recommend
that it be performed by two people: one to drive the vehicle and one to oper-
ate the DriveRight 130AL.
1. If necessary, press and hold MODE down to access the settings
screens.
2. If necessary, press and release MODE until the Calibration screen
appears.
The calibration speed (25 or 40) appears at the bottom right of the display.
The uncalibrated speed reading appears at the top of the display, along with
the unit of measure (MPH or km/h). Note that until you calibrate the Drive-
Right 130AL this speed reading will be inaccurate. The distance, which
appears in the lower left of the display, is not necessary for this calibration
procedure.
CAL
MPH
DISTANCE
MILES
Calibration Speed
Uncalibrated Speed Reading
SETTINGS