Precisa 490 IB Series, Руководство по эксплуатации, Страница: 13 / 46

7 Set up ■
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7.4 Choosing a suitable location
The balance location must be chosen in such a way as to guarantee perfect operation of your balance, so
that the allowable ambient conditions and prerequisites are met and maintained:
• Put the balance on a solid, firm and preferably vibration-proof, horizontal base
• Make sure that the balance cannot be shaken or knocked over
• Protect from direct solar radiation
• Avoid drafts and excessive temperature fluctuations
7.5 Connecting the balance to the mains
The following safety recommendations must be observed when connecting the balance to the mains:
7.6 Levelling
To function properly, the balance must be precisely horizontal.
The balance is fitted with one spirit level and two adjustable feet for level-control, with the aid of which it
is possible to compensate for small height differences and/or unevennesses in the surface on which the bal-
ance is standing.
The two screw feet must be adjusted so that the air bubble is precisely in the centre of the sight glass of the
bubble level.
7.7 Calibration of the balance
Since the Earth's gravity is not the same everywhere, each balance must – in accordance with the underlying
physical weighing principle – be adjusted to compensate for the gravity at each location. This adjustment
process, known as “calibration”, must be carried out on initial installation and after each subsequent reloca-
tion. In order to get exact measurements, it is recommended moreover, that the balance should also be cal-
ibrated periodically.
NOTE
With difficult conditions (where the balance may be easily shaken or subject to vibration) the balance can
nevertheless provide accurate results through suitable adjustment of the stability control (see chapter
8.3.6 "Weighing mode").
DANGER
The balance may only be operated with the power adaptor supplied.
Check before connecting the power adaptor to the mains supply that the operating voltage stated on the
on the balance or on the power adaptor agrees with the local mains voltage.
If the operating voltage is not the same as the mains voltage, the balance or the power adaptor must on
no account be connected to the mains supply. Contact the Customer Service.
Incorrect Correct
NOTE
In order to get exact measurements, the balance must again be carefully levelled after each relocation.
NOTE