Operating instructions

Calibration/Adjustment “isoTEST”
Purpose
Calibration is the determination of the
difference between the weight readout
and the true weight (mass) of a sample.
Calibration does not entail making any
changes within the scale.
Adjustment is the correction of this
difference between the measured value
displayed and the true weight (mass) of the
sample, or the reduction of the difference
to an allowable level within maximum
permissible error limits.
Using Verified Scales as Legal Measuring
Instruments in the EU*:
Before using your scale as a legal measur-
ing instrument, you must perform “internal
calibration” at the place of installation
after the warmup period.
* including the Signatories of the
Agreement on the European
Economic Area
Available Features
You can start the isoTEST function
at the press of a key to check a scale
used as measuring, inspection and
test equipment at any time. The scale
is calibrated and any deviation is
displayed. Press the
Start soft key
to start adjustment. If you do not wish
to have the scale adjusted, press the
End soft key to cancel the isoTEST.
Your scale can be calibrated externally
(Scale parameters: Calibration/adjust-
ment: CAL key function; menu item
Ext. cal./adj.;
factory-def. wt. or
Ext. cal./adj.;
user-defined wt.) or
internally (
Internal
cal./adjustment).
External calibration can be performed
– using a pre-set weight value
Ext. cal./adj.;
factory-def. wt., or
– with a user-defined weight
Ext. cal./adj.;
user-defined wt.
The adjustment can be performed
– automatically following calibration:
Cal., then auto
adjust. or
– if desired, the adjustment operation can
be started manually after calibration:
Cal., then manual
adjust
You can also configure whether the
calibration mode
– will be activated according to the
specific setting (external/internal) or
– can be selected by the user after
pressing the
isoTST soft key:
Selection mode.
You can have the scale automatically
display an adjustment prompt after a
certain time interval has elapsed since
the last calibration/adjustment or when
the ambient temperature changes by a
defined amount.
You can also configure the scale to
perform calibration and adjustment
automatically (isoCAL) when the
pre-set time and/or temperature limit
is reached
On and reset
application and On with-
out resetting app.
You can have the calibration/
adjustment results documented in
a ISO/GMP-compliant printout;
see page 107.
Factory Settings
Calibration/adjustment mode:
Internal cal./adjust-
ment
Calibrate, then manual adjust:
Calibrate, then manual
adjust
isoCAL function (automatic initiation
of cal./adj. sequence):
On with-
out resetting app.
For service technicians only:
External Calibration in Verified Scales
of Accuracy Class K
– External calibration is blocked when the
scale is used in legal metrology
> External calibration can only be
released after removing the verification
control seal, in which case the validity
of the verification becomes void and
the scale must be re-verified
– External calibration can now be
performed
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