18
Calibration and Adjustment
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 balance.
Adjustment is the correction of any
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
the maximum permissible error limits.
Using Verified Balances as Legal
Measuring Instruments in the EU*:
Before using your balance as a legal
measuring instrument, you must per-
form “internal calibration" at the place
of installation after the warmup period.
Features
Calibration/adjustment can be
performed only when:
– there is no load on the balance,
– the balance is tared, and
– the internal signal is stable.
If these conditions are not met, an error
message is displayed (Err 02).
Adjustment can be performed
– automatically following calibration
(1 10 1), or
– manually, at operator discretion,
after calibration (1 10 2)
* Including the Signatories of the Agree-
ment on the European Economic Area
The weight displayed for the sample
on the balance must not differ from the
nominal weight by more than 2%.
You can use any of the following weight
units to calibrate/adjust the balance:
g, kg, lb (1 11 1 to 3, factory setting:
1 11 1)
You can block calibration/adjustment
of the balance as follows:
– Select menu code 1 9 7, and
– Close the menu access switch on the
back of the balance
– You can have calibration/adjustment
start automatically when a specified
time or temperature limit is reached
(isoCAL function; 1 15 3).
You can have calibration and adjustment
results documented as an ISO/GLP-
compliant printout; see page 47.
External Calibration in Verified
Balances of Accuracy Class K
– When the balance is used in legal
metrology, external calibration is
blocked by a seal over the menu access
switch.
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