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On pressing the [Cal] key the display will show the busy symbol and a line of dashes and
then after a few seconds will display 'CALIbrA'. Then the busy symbol and a line of
dashes will reappear, followed by 'CAL On'. Then 'CALIbrA' will appear again, followed by
the busy symbol and a line of dashes. Finally 'CAL OFF' will be displayed, followed by a
beep and the busy symbol and a line of dashes. A final beep will sound the end of
calibration and the display should return to '0.000 g' or similar. Internal calibration is now
complete and normal operations may be continued.
6.2.3 Calibration using External Calibration mass
Note: Calibration mass used should be a known accurate item, ideally with an OIML
or ASTM/ANSI classification appropriate to the accuracy of the balance.
On pressing the [Cal] key the display will show the balance setting a new Zero condition
by showing "LOAd 0". Make sure the pan is empty then press the [Setup] key to continue
The display will show the busy symbol and a line of dashes and then after a few seconds
will display the default calibration mass. For example, for a "213" model (210g capacity,
1mg readability) the display will be "200 g" where 200 g is the default calibration mass.
Place the selected mass on the balance. The balance will automatically continue. The
display will show the busy symbol and a line of dashes and after calibration is complete it
will sound a beep and display "unLOAd". Remove the weight. Another beep will be heard
confirming the unloading action. The balance will display the busy symbol and a line of
dashes for a few seconds and then sound a beep and return to normal weighing.
6.2.4 Automatic Calibration
The balance has the ability to ask for calibration when the balance has automatic
calibration enabled and the conditions of the automatic calibration have been met.
Conditions that will cause an automatic calibration are:
Internal temperature change greater than a pre-set amount (typically 2ºC for
Precision balances).
Time since last calibration exceeds a pre-set time (typically 4 hours, or 15 minutes
after power is applied).
The balance will call for calibration to be carried out by flashing the "CAL" symbol on the
display. As soon as the balance is calibrated the symbol will be turned off.
The Auto calibration feature can be enabled, disabled or changed within the user options
to meet the requirements of the users.
6.2.5 Calibration Errors
Occasionally during calibration an error will be detected. These errors can be caused by:
Unstable readings
Improper calibration weights being used
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