LW Measurements HRB 1002TL - Manual (Page 15)

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3.6 Leveling the weighing machine
To function properly, the balance must be precisely horizontal. The balance is fitted with one bubble level.
and adjustable feet for level-control, with the aid of which it is possible to compensate for small height
differences and / or any unevenness in the surface on which the balance is positioned.
The screw feet must be adjusted so that the air bubble is precisely in the center of the sight glass of the
bubble level (see Fig. 1)
Place the scale horizontally and keep the bubble inside the bubble level aligned with the red circle (See
Fig. 1). In order to get exact measurements, the balance must again be carefully leveled after each
relocation.
Fig. 1 Correct leveling with the aid of the bubble level
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3.7 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).