Great Plains NTA2007 Material Rate - Manual (Page 9)

Great Plains Manufacturing, Inc. Contents Appendix Setting Meter Rate 7
2012-01-03 Contents Appendix 167-085B
Meter Calibration
The rate charts are based on cleaned untreated seed of
average size and test weight. Many factors affect meter
rates including foreign material, seed treatment, seed
size, field conditions, and test weight. The Fertilizer Rate
Chart is based on a representative granular fertilizer.
Great Plains recommends calibrating for the exact
materials you intend to apply. Calibration determines two
very important settings for achieving accurate rates:
• The Kg/ha (or pounds per acre) of the meter at the
current variable rate gearbox setting for your particular
seed or fertilizer.
• The Calibration Constant for the monitor to accurately
report the planting rate of your particular seed or
fertilizer.
Calibration Procedure
The seed monitor must be correctly set up for both the air
drill and the material(s), or the calibration will not result in
useful console displays.
1. Set the Final Drive Range gears and Variable Rate
Gearbox setting to the values suggested in the Seed
Rate Chart (or Fertilizer Rate Chart).
2. Make sure there is enough material in the hopper(s)
for at least
1 ⁄
10
hectare (or
1 ⁄
10
acre) plus an extra
35 to 45 Kg (75 to 100 pounds).
Refer to Figure 8 (which depicts a meter without guards - if
your cart included guards, do not operate without them)
3.
Only one calibration bag is provided, so remove one
of the final range gears
from the meter that is NOT
being tested, to disable it.
4. Open the calibration door of the meter being
calibrated. The calibration door is the door furthest
from the DRIVING gear, and may be marked with a
decal.
Figure 7
Calibration Door Open
26339
1
2
DRIVING
DRIVEN
1
2