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4. Installation
For Basic Operation
4.5 Span Calibration
After installation, be certain to complete warm up and span calibration. During span calibration, the bal-
ance must be left in a very stable condition. To do this, leave the power on at standby (warm up) for an
hour or more before performing calibration. When using the AUW-D series in the small range (mini-
mum display 0.01mg), leave the power on for at least four hours. Also, perform calibration in conditions
without people entering and leaving the room and without air flow or vibration. The AUW series is
equipped with display backlight. Use of the backlight requires warm up in mass display such as "g", not
in standby state. The default setting of backlight is ON.
For AUW-D/AUW/AUX Series (No operation is required)
Fully-automatic span calibration by PSC
The default setting is ON for PSC, which performs fully-automatic span calibrations. When PSC is ON,
span calibration is automatically performed, if necessary, when the gram display first appears after the
balance is turned ON (See
). When PSC operates, the weight symbol starts blinking about two
minutes beforehand for notification. During operation, the display will automatically change and the
motor sound of the weight loading system is heard. In order to ensure proper PSC operation, prevent
vibrations and air flow. When gram display returns after completion of span calibration by PSC, mea-
surement can begin according to 5. Basic Operation. (Fully-automatic span calibration by PSC is set to
ON by default. Also, span calibration with built-in calibration weight is set as preset calibration method
by default. For other methods, please refer to 10. Calibration. The AUW-D/AUW series also allow
Clock-CAL function to perform span calibrations regularly by time settings.
Note
Using a verified balance as a legal measuring instrument in the EU:
Span calibration must be performed once the balance is installed and
before using the balance as a legal measuring instrument in the EU. The
balance must be connected to power and warmed up for at least one hour
prior to span calibration and use as a legal measuring instrument.
When intending to use the AUW-D series in the small range (minimum dis-
play d=0.01mg), warm it up for at least four hours.
Note
For accurate measurement, perform span calibration again when the bal-
ance is moved or when the temperature of the installation site has
changed. It is recommended that either PSC or Clock-CAL be set to ON so
that the necessary calibrations will operate automatically.
