LW Measurements LDS Large Drum Scale - Manual (Page 18)

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If the operating voltage is not the same as the mains voltage,
the power adapter must on no account be connected to the
mains supply. Contact customer service.
3.6 Calibrating the weighing machine
Since the Earth’s gravity is not the same everywhere, each
balance must be adjusted to compensate for the gravity
differences at each location in accordance with the underlying
physical weighing principles. This adjustment process, 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 balance should be calibrated regularly using a known
external calibration weight (see Section 5 below).
4 Working with the application menu
using the Key-Pad