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Driftless SW Wisconsin | An "impact" type yield monitor does measure the inertia/impact of grain against a plate but there is also a friction component of the grain hitting the plate. The plate is generally not square to the flow but at a bit of an angle so grain will flow without plugging. These plates are often coated with a low friction material but there is still a friction component.
From tests years ago, anything that affects the friction component of load on the plate also affects the reading. Moisture from rain, dew, green stems etc will change the coefficient of friction from the calibration load. The yield monitor should be calibrated and re calibrated at any opportunity and definitely if conditions/crops change. If you do not re calibrate when conditions change from the original calibration conditions then an impact/friction type yield monitor will become more of a relative measure of yield variation through the field rather than absolute.
Jim at Dawn | |
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Yield monitor accuracy try #2
