Operating instructions

40
Calibration and Adjustment
Purpose
The accuracy of weighing results must
be carefully controlled. This is achieved
through calibration and adjustment.
Calibration technically means to deter-
mine the difference between the weigh-
ing instrument readout and the actual
weight on the platform to determine
the accuracy. This does not involve
making any changes in the weighing
platform.
Adjustment means to bring a weighing
instrument to the level of accuracy
required for its use.
Configuring Functions for Use of the
Weighing Platform in Legal Metrology
(for service personnel only)
Proceed as follows to use the Combics
in legal metrology:
– Block external adjustment
Preparation
§ Remove the covering panel on the
left-hand side of the back of the
indicator.
§ Move the switch to the right.
> Switch on the left:
For legal metrology (external
adjustment blocked)
(Factory setting on verified models)
> Switch on the right: External adjust-
ment accessible
Features
Which of the following features are
available depends on the connected
weighing platform:
– External calibration/adjustment with
the default weight value or standard
weight (1.9.1) (not available on verified
weighing platforms)
– External calibration/adjustment with
a user-defined weight (1.9.3)
(not available on verified weighing
platforms)
– Internal adjustment for an IS platform
configured as WP2 (1.9.4)
– Block the function of the ) key when
pressed > 2 seconds to prevent use of
the functions described above (1.9.10)
– Calibration followed by automatic
adjustment (1.10.1) (not available on
verified weighing platforms)
– Calibration, optionally followed by
(manually triggered) adjustment (1.10.2)
(not available on verified weighing
platforms)
– Calibration prompt: flashing W symbol
(1.15.2). If more than one platform is
connected, the platform number is also
displayed.
– Block external calibration/adjustment
(1.16.2)
– No external adjustment on verified
weighing platforms
– Altitude and degree of latitude or
gravitational acceleration displayed
after Cal is shown when the calibration
procedure is started, if these values have
been entered in the Combics by service
personnel and are supported by the
connected platform.
For each of these parameters, the term
is displayed first (Altitud, Latitud,
or Gravity) for approx.
1 second, and then the corresponding
value is displayed continuously until
you press ).
Preparation
§ Press the e key to switch on the
Combics
§ While the self-test of the display
segments is running, press the ) key
§ Open the Setup menu: Press the k
key twice
§ Select the Setup menu: Press the
) key
§ Select weighing platform 1
(by pressing ))
With the Combics 2, you have the option
of selecting weighing platform 2:
– Select Com-1 or Unicom (depending
on which interface the second platform
is connected to)
– Select WP-2
– Press ) twice
1 Weighing platform parameters
1.1 ... 1.8
1.9 Calibration function
1.9.1 External calibration/
adjustment with default weight
1.9.3 External calibration/
adjustment with user-defined
weight
1.9.4 Internal adjustment
(for WP2 only)
1.9.10 Block the function of
) key when pressed > 2 sec.
1.10 Calibration/adjustment sequence
1.10.1 Calibration/adjustment
in one operation
1.10.2 Calibration; adjustment
triggered manually
1.11 ... 1.14
1.15 Calibration prompt
1.15.1 Off
1.15.2 On
1.16 External calibration/adjustment
1.16.1 Accessible
1.16.2 Blocked
1.18 Enter calibration weight
1.18.1 User input
§ Save settings and exit Setup:
Press and hold the ) key