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Distance calibration is important. Population readings, area calculations, and
ground speeds are just some factors dependent upon distance calibration value. Calibration
procedure must be performed under actual field planting conditions to account for wheel
slippage and other factors. If calibration procedure is performed on a hard flat surface
instead of under field conditions, every reading using the calibration number for calculation
purposes can be in error.
A distance calibration can only be performed with an operational radar unit installed. If the radar fails, seed
flow can still be monitored by entering a fixed speed into monitor. See SPEED SET MODE in this section.


http://manuals.deere.com/omview/OMA77221_19/OUO6074,00006FD_...