Rice Lake Lift Truck/Pallet Jack Scales - Intercomp PW800 - Manual (Page 11)

PW800, Users
Rev O, January, 2008
11
Calibration
How to test Calibration
This calibration procedure should be performed annually for normal operating conditions. If the
scale is damaged, or service has been performed on the scale, use this calibration check.
1: Press the ON switch.
2: It is recommended that you allow the electronics to operate for three minutes after first
turning power on. This allows the electronics to become stable for maximum accuracy
during the calibration check.
3: Make sure no weight is on the load cell(s). Press the ZERO switch. The weight shown is
zero.
4: Apply weights at various points within the load range and verify that the displayed weight is
within +/- 0.1% of applied load.
5: If possible apply a weight of 105% of capacity to verify that the scale shows overload.
6: Verify the scale displays zero when the calibration weights are removed.
7: If there is a failure to meet any of the conditions above, please refer to the Calibration
Procedure.
8: When all the conditions above are correct, the scale is operational.
Calibration blocking switch
The calibration of the scale is protected from accidental change by a shunt placed on a header
on the circuit board. The cal header (labeled CAL/RUN”) is located opposite the display side at
the top and middle of the circuit board. Calibration is set in the “calibration blocked” (shunt is
on the RUN side of the header) mode at the factory. To enable calibration, move the shunt to
the CAL side of the header. When you are done calibrating, return the switch to 'RUN' to
protect against change.