Calibration
© Rice Lake Weighing Systems
●
All Rights Reserved
17
5.0
Calibration
This section provides an overview of MSI-4260M Port-A-Weigh Crane Scale calibration instructions.
The MSI-4260M is calibrated using the certified test weights. It is required that the weight used is at least 10% of full capacity in
order to achieve rated accuracy. For example, use at least a 500 lb test weight to calibrate a 5000 lb capacity scale. Although a
single span point is usually adequate for rated accuracy, the MSI-4260M supports Multi-Point calibration with up to four span
points plus zero.
When adequate test weights are not available, the MSI-4260M can be re-calibrated using a calculated calibration constant
which is referred to as C-Cal. To use C-Cal, a previously generated C-Cal number must be known.
There are three kinds of calibration:
•
Standard Calibration
– Used for maintenance and routine calibration
•
Initial Calibration
– Used to set up both the capacity and resolution (d) of the scale; It differs from Standard Calibration
only in the initial steps; The initial calibration is performed after a calibration reset which completely erases the calibration
and setup memory
•
C-Cal
– If the last calculated C-Cal values is known, the MSI-4260M can be calibrated without weights
5.1 Calibration Switch Access
Use the following steps to access the calibration switch on the MSI-4260M if calibrating the unit using either the standard
calibration or the C-Cal calibration.
1. Remove the hex seal screw from the MSI-4260M.
Figure 5-1. Calibration Switch Seal Screw
2. Using a small screwdriver, press the Cal switch located behind the hex seal screw (
).
displays.
