Great Plains NTA2000D Operator Manual - Manual (Page 45)

Multi-function Drill Control
38e
Manual Speed Calibration
The theoretical calibration figure is 127.4 inches if the instrument is set for
imperial units, or is 3.235 meters if it is set for metric units.
Default = 78.78 inches (2.000m)
NOTE: An ‘Autocal’ is more accurate in field conditions
1. Select the channel.
2.
HOLD to enter program mode 1. The top/bottom horizontal
segments indicating metric/imperial units are displayed briefly before
the calibration factor appears. Continue holding the button and…
3.
PRESS to select the digit or decimal point to change.
4.
HOLD to change the selected digit (or move the decimal point).
5.
RELEASE to select the next digit and repeat as above, otherwise
simply release both buttons. The instrument will then return to the
normal display mode.
‘Autocal’
For maximum accuracy, perform an auto-calibration in field conditions.
1. Set two markers at 328 feet (100 meters) apart. Choose a convenient
reference point on the tractor/implement and position this point
opposite the first marker.
2.
Select the channel.
3.
HOLD until the calibration factor is displayed.
4.
Continue holding this button and press .
The display flashes ‘Auto’ ready for calibration.
5. Drive the vehicle until the chosen reference point on the
tractor/implement is opposite the second marker.
The instrument counts and displays the sensor pulses received over
the distance traveled.
6.
Press the button to complete the Autocal routine.
The calibration factor is automatically calculated and stored in
memory.
Figure D
Enter Cal Mode 1 (S.S.F)
Figure E
Change S.S.F.
Figure F
Start ‘Autocal’
328ft (100m)
Figure G
‘Autocal’ distance
Figure H
Stop ‘Autocal’