Ag Leader Yield Monitor 2000 Operators Manual - Manual (Page 47)

Yield Monitor 2000
Calibrating Grain Weight
Ag Leader Technology
June 1997
3-11
Before You Begin Calibrate the moisture before calibrating grain weight. Refer to the
instructions in this section for moisture calibration.
You must calibrate the monitor for grain weight (lbs) for each grain type
before the monitor will accurately measure bushels. You should be able to
calibrate your yield monitor for grain weight to an average error of 1 percent
to 3 percent.
IMPORTANT: Before calibrating, it is extremely important that you
check the clearance between the tip of the clean grain elevator paddles
and the inside of the elevator housing at the top of the clean grain
elevator. There must be ½ inch or less clearance as the paddle rotates
around the top sprocket. If your clearance is more than ½ inch, your
calibration will likely be inaccurate.
You do not have to calibrate grain weight at the beginning of the season to
get accurate results, although it is recommended. Each time you calibrate the
monitor, it will automatically correct all grain weights for all the loads of that
grain type that were previously harvested.
Note: Because the monitor measures the weight, not the volume, of the
grain hitting the flow sensor, test weight and different varieties do not cause
calibration inaccuracies.
C Numbers The 11 C Numbers, C1 through C11 determine the pounds that the monitor
calculates from the data that it records into your loads as you harvest. You
can display the C numbers under the GRAIN key. Changing the C numbers
changes the pounds in every load set on that grain type for which the C
numbers were changed. Anytime you calibrate the monitor it adjusts the C
numbers automatically.
The C numbers initially should be set to the same values that appear on
your initial calibration sheet. (Refer to the Setup section). With the C
numbers set at their initial value, your accuracy of grain weight measurement
may be only in the +/- 20 percent range.
Note: After the monitor adjusts the C numbers when calibration is complete,
do not set them back to the initial values from the machine calibration sheet.
If you do, you will change calibration accuracy.