Here is the equation to figure out what the calibration number would be.
.4 mv/v X Capacity X # of Bars / mv/v Output of the weigh bar = good starting Calibration #
Example:
We will be using a 141907 weigh bar in this example. Capacity 30,000 # and has 1.5 mv/v at that capacity.
.4 mv/v X 30,000 #’s X 3 weigh bars / 1.5 mv/v = 24000
*** Please note *** I said that there were 3 of the 141907 weigh bars even though the hitch weigh bar would probably be a 143480 weigh bar. The reason for this is that the hitch capacity and mv/v ratio is the same for the hitch bar and the spindle.