Appendix B
228 Viper Pro Installation & Operation Manual
4. Touch the Reset button next to the Distance display on the Tally Registers screen.
5. Drive a known distance:
a. Re-run the same test distance driven during the Calibration Assistance procedure.
b. Drive a test distance of 1 mile [1 km].
Note: Accelerate and decelerate slowly. To achieve the most accurate calibration, do not use the
vehicle odometer or the field computer distance display to measure the actual distance driven.
6. Record the distance from the field computer Tally Registers screen.
If the distance display on the Tally Registers screen matches the measured test distance, the calculated
speed cal is correct. If the distance display does not match, repeat the Using the Calibration Assistance
section on page 226 to recalculate the speed cal automatically or use the Speed Cal Formulas section on
page 228 to manually calculate the speed cal value.
Note: If a test distance of one mile [1 km] is used, the distance value displayed on the Tally Registers
screen should be 5280 feet [1000]. If the value displayed in the Feet [Meters] field is between
5260 [980] and 5300 [1020], the current speed cal value is correct.
Speed Cal Formulas
Perform the following calculation to determine the speed calibration
where OSC = the Old Speed Cal value, D = the Viper Pro odometer reading, and CSC = the Corrected Speed
Cal.
For Example:
Using the default Speed Cal of 598 [152], and a Viper Pro odometer reading of 5000 feet [980 meters]:
in English Units:
the Corrected Speed Cal is 631.
in Metric units:
Therefore, the Corrected Speed Cal is 155.
OSC 5280×
D
------------------------------ CSC=
598 5280×
5000
---------------------------631=
152 1000×
980
---------------------------155=
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