LW Measurements SCT 1200 - Manual (Page 18)

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3.7 Calibration of the weighing machine
Since the Earth’s gravity is not the same everywhere, each
weighing machine must be adjusted to compensate for the
gravity differences at each location in accordance with the
underlying physical weighing principles. This adjustment
process is known as calibration and must be carried out on
initial installation and after each subsequent relocation.
In order to ensure exact measurements, it is recommended
that the weighing machine should be calibrated regularly using
a known external calibration weight (see Section 5 below).