APPENDIX
A
Manual No. 016-0171-148 175
A ppend ix A
Calculating the
Calibration Values
Speed Cal
Raven industries recommends the following values for the initial speed cal:
These values are usually a good starting point and will generally yield adequate results; however, the speed cal
should still be refined for each vehicle.
Note: The GPS speed over CANbus feature is only available with specific Raven speed sense nodes.
1. Make sure any section switches are turned OFF before powering the console ON.
2. In the System menu, touch the Product Control icon and touch the Speed button.
3. Touch the Distance button and then reset the odometer display to “0” using the keypad.
4. Drive 1 mile [1 kilometer]. The field computer will measure the distance driven using the original (or last
programmed) speed cal.
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. Use
section lines or highway markers to determine the actual distance.
5. At the end of the driven distance, view the distance display again and record the value.
a. The field computer distance should read a value of approximately 5280 [1000]. If the display reads
between 5260-5300 [990-1010], the default value of 598 [152] is accurate for the speed cal value.
b. If the distance displayed is not between 5260-5300 calculate the speed cal with the formula:
where CSC = Corrected Speed Cal, OSC = Old Speed Cal (speed cal number used to drive the test
distance) and D = the field computer Distance reading. Round to the nearest whole number.
Sensor Type
Setting
Used with English Metric
Radar/GPS
External Raven GPS
Receiver
785 199
Internal DGPS Receiver 812 206
GPS Speed over CANbus 1000 254
Raven Radar 598 152
Wheel
Wheel Magnets 1000 254
Speedometer Drive Speed
Sensor
612 155
CSC
OSC 5280×
D
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