The more frequently calibration is completed, the more accurate a seeder will be. A number of variables, including product weight and changing climate conditions throughout the day, will have an effect on any volumetric metering system; with the John Deere ActiveCal system, calibration can be done from the cab of the tractor while seeding to minimize the variation in product metering.
The process to calibrate the cart starts with the Gen 4 CommandCenter™ 4600 display in the work setup page. On the work setup page, the operator defines product types, rates and selects meter roller. Based on information enter into the work setup page, a preconfigured meter displacement value (MDV) will populate per meter. An initial manual calibration will give the most accurate MDV to start with, however, the preconfigured MDV will be a good starting point for growers who do not wish to manually calibrate.
The operator engages ActiveCal while stationary and once the button is selected on the screen, begins seeding. When enough product has been metered out, typically after about 8-12 acres of seeding, depending on the product, the Gen 4 CommandCenter will prompt the operator to stop. When convenient to do so, the operator stops and the data points are calculated. New MDVs with percent difference is provided and can be accepted or rejected. If accepted, the system automatically calibrates to the new MDV. If rejected, the system continues at the previously calibrated numbers.