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Missouri | Unless the change in speed is sudden and extreme, the monitors usually compensate pretty well. Moderate changes in speed usually have minimal effect on yield reading, the system knows the average time grain takes to run through the separator, and it correlates the grain flow at this instant with the position and speed you were at x seconds ago. You can tell by watching the monitor on a pass where the swath width abruptly changes and watching the monitor. It happens faster than you think. 8 seconds or so I think is what I have observed. Coming to an abrupt stop (obstacle in the field, clearing a header slug, etc) usually produces a spike larger than the system corrects for.
If the high yield indication is due to abrupt speed change, it will only be a few seconds long. If it is due to and abrupt crop condition change, it will be a little bit longer, and it will usually show on adjacent swaths as well.
If it is in fact due to yield change, you have a excellent machine operator who is paying good attention to matching feed rate to combine capacity, whether he's doing it manually by watching the crop on the header, listening to the sound of the machine, watching the tach, or my favorite method is by watching the grain flow reading on the monitor. The old 9400 I ran for a great many years began to struggle in corn at 1100bu/hr, and by 1200bu/hr was starting to throw corn out the walkers.
Is there anything else in that portion of the field that would cause an operator slowdown? A ditch, rough or wet spots, etc? | |
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Cleaning up yield data
