20
Note: Once the auto calibration mode has been activated, no other
functions of the 844 are possible until the console receives speed impulses
for calibration.To deactivate the auto calibration mode, press the
key twice.
During the automatic calibration step, the 844 automatically senses if a radar
ground speed sensor is installed. If you prefer to enter the speed value manually,
refer to the following instructions.
Manual Calculation:
To manually calculate the proper value for Wheel Speed Sensor pulses, you
need to know the circumference of the wheel to which the sensor is mounted. It
can be measured by marking the tire and measuring the distance covered as
that mark makes one full revolution.Then use the following formula:
3600 x {# magnets on wheel (usually 2)}
i.e.
3600 x 2
= 240
___________________________________ ________
Wheel Circumference in inches 30
10,000 x {# magnets on wheel (usually 2)}
i.e.
10,000 x 2
= 250
___________________________________ ________
Wheel Circumference in cm 80
The result can be entered as an alternative to using the automatic calibration
method. Use the or keys to adjust the value. Press the key to validate
the value and advance to the next programming step.
RADAR SPEED PULSES
Automatic Calibration:
The automatic calibration of a Radar speed sensor is similar to the automatic
calibration of a wheel speed sensor. Refer to the directions above. When the
console has determined that a Radar Speed Sensor is being used,
rAd will be
displayed in the lower left of the console display.
Manual Calculation:
To manually enter the radar calibration value, first press the Auto/Man key to put
the control console into radar mode. When the Control Console is in the manual
radar calibration mode,
rAd will be displayed in the lower left of the console
display. Now use the or keys to adjust the value. When the correct value
has been entered, press the key to validate this value.
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