12 USER MANUAL
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10. Internal calibration
The ATA balances are equipped with internal calibration system, which general task is to maintain
required measurement accuracy.
Internal calibration is the process of putting internal weight on automatically by balance mechanism and
correcting accuracy in balance firmware. The correction is necessary because of differences between
values of gravitational acceleration in the place where the balance was manufactured and in the place
where it is operated, as well as due to changes of balance level and temperature.
Internal calibration is performed in the following situations:
- when key is pressed twice,
- after defined time interval (for balances comply with verification requirements - 2 hours),
- after temperature change (for balances comply with verification requirements – more than 1
o
C).
For balances comply with verification requirements time interval is set to 2 hours and defined temperature
change is 1
o
C. In other balances those values can be set as calibration options. The reason of starting
internal calibration is shown as an icon near weight picture.
In order to perform internal calibration proceed
with the following:
Empty the pan.
Press key twice (double pressing the key
helps to avoid accidental starting calibration
procedure).
During calibration internal weight is put three
times on and obtained results are compared.
Discrepancy of results is signalled with a
message and causes the balance being
blocked.
Until calibration process is finished do not
perform any operation on the balance. Any
vibrations and shocks interfere calibration
process and may delay it or deteriorate
accuracy of its result.
When internal calibration is performed
successfully the balance indicates zero on the
display at empty pan.
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