TeeJet ARC-6000 - Manual (Page 19)

2-9
98-0501
Rev.- 1
ARC 6000
CE & S
TANDARD
V
ERSION
Selector switch back to OPERATE, the corrected Indicated Amount will be displayed. If this number does not match
the Actual Amount, check the calculation.
NOTE: Write down the spreader constants for different gate settings. Use these numbers whenever that gate setting is
selected.
If it is not convenient to conduct an actual test, field experience will allow fine tuning of the spreader constant. If the
spreader is applying too much, decrease the spreader constant by the same percentage as the over application. If too
little material is being applied, increase the spreader constant by the same percentage as the under application.
2.7. DISTANCE CALIBRATION, GROUND SPEED SENSOR
2.7.1. GENERAL CONSIDERATIONS AND INITIAL CALIBRATION NUMBERS
The control console must be calibrated for the ground speed sensor installation to ensure accurate application rates. The procedure
involves physically measuring an accurate distance along a road or field, driving the vehicle through that distance, and
mathematically comparing the distance computed by the control console to the actual measured distance. If the two distances
compare exactly, no change is necessary. If the distances do not compare exactly, the console can be calibrated by changing the
distance calibration number a proportionate amount. Following the recommended procedure below will ensure accuracy of
operation.
The distance calibration must be periodically checked. This is especially important if the sensor has come loose or been
repositioned, or if the tires have been changed.
Use the following initial calibration settings to get started. For the radar this number will be pretty close. For the wheel speed
sensor and the speedometer sensor the adjustment to this initial calibration number may be very large, depending on the
configuration of the vehicle. It is important to field calibrate the distance sensor to insure optimum accuracy!
RADAR - 1000 WHEEL SENSOR - 3500 SPEEDOMETER SENSOR - 3500
A. Set the control console switches to the following settings:
Power ON
Mode Selector SETUP
Display Selector DISTANCE
The display will now show the current distance calibration value.
B. Use the INC/DEC switch to select the initial distance calibration value suggested.
You are now ready to perform the distance calibration.
2.7.2. DISTANCE CALIBRATION PROCEDURE
The following procedure is recommended by MIDWEST TECHNOLOGIES for establishing an accurate distance calibration.
NOTE: All boom switches should remain OFF during the entire procedure.
1. Fill the vehicle 1/2 full of material, to approximate actual load conditions. This will minimize the effect on the radar
mounting angle and/or actual working diameter of the tires as the load empties.
2. Measure out a known distance of 400 ft. or more in a field or roadway. The longer the distance, the more accurately the
test can be performed, but keep it in even hundreds of feet and the calculations will be easier.
3. Drive the vehicle to the starting point of the distance range and stop.
4. Turn the Display Selector to the DISTANCE position and the Mode Select switch to the SET- UP mode. The console
will display the current Distance Calibration Number. Record this number for future reference. As an example, assume
this number is 1000.