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Minnesota | I have not owned a 7120 combine, but I have had 3 different combines with CIH OEM yield monitors, which I have all calibrated to within 2-3% of scale weights.
The CIH yield monitor system allows you to have up to 10 calibration loads. You need to calibrate at different crop flow rates because ---this is especially important if you have variable crop conditions. You should run a couple cal loads at your typical flow rate. Then, run at least one load at the highest crop flow you can without slugging your machine...and then run a cal load at the lowest flow you can stand to combine (can either drive painfully slow or take a partial header width). More data points in the calibration will make higher accuracy.
You also want to try to combine the cal loads at consistent crop flow rates. For example, try to combine one load with the crop flow as close to 2500 bu/hr as you can for the entire load. If your crop is uneven, then you will need to drive faster or slower to maintain the flow rate. Then pick some higher and lower flow rates and do more cal loads.
It's always going to be hard to get accurate data in both very poor and also very high yield areas, but you should be able to average better than 12%. | |
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Yield monitor has wide sings in accuracy
