Great Plains Electronic Acremeter - Manual (Page 5)

Great Plains Mfg., Inc.
Installation Instructions 5
2014/07/23 194-074M
Calibrating Pulses per 400 Feet of Travel
Note: Calibration is not recommended for the 2S-2600,
3S-3000, 3S-4000, or 3S-5000. Any value other
than 17 pulses per 400 feet results in reduced
accuracy of area measurement.
Refer to Figure 6
The acremeter can count pulses, and if the distance
driven is known, the pulses per 400 feet of travel
b
may be
entered. Run the test with the drill unfolded, and the
openers raised.
Pulses Per Mile
Note: If you have documentation yet from a past design
of acremeter listing the pulse value stated as
pulses per mile, divide that value by 13.2 to arrive
at a new number. (5280 feet per mile/400 ft =
13.2). If you get a fraction round up to the next full
digit for the best accuracy.
Pulses Per 400 Feet
To calibrate the pulses per 400 feet of travel, press and
hold the UP and DOWN buttons until “0” appears in the
PULSES display. The acre counter is now ready to count
shaft rotations.
Enter the tractor cab and drive 400 feet.
Press the button to wake up the acre counter. The
“PULSES” LED will again blink. The number displayed is
the pulses per 400 feet. Press the
button to accept the
setting. The “PULSES” LED will stop blinking and remain
on.
b. For more accurate calibration, operate for some multiple of 400 feet (say 1600 ft) divide the count by that multiple and round off.
Figure 6
Count Pulses Per 400 feet of Travel
34778
Pulses Per 400 ft of Travel
PulsesCounted PerMile
13.2
------------------------------------------------------- =