14
USER MANUAL
____________________________________________________________________________________________________________________
12.
Checking the balance
In order to confirm correctness of the balance during its operation, before
starting and after finishing every measurement series it is advised to check
weighing accuracy. It can be done by weighing external calibration weight or
other object with exactly known mass.
If exceeding of allowable measurement error is affirmed, the following things
should be checked:
-
if the balance stands stable and it is levelled,
-
if the balance is exposed on rapid air blasts, vibrations, rapid temperature
changes or air humidity,
-
if the balance is not affected directly by heat source, electromagnetic
radiation or magnetic field.
The cause of inaccuracy can be too low temperature of the balance as well,
when it was unplugged from power supply. In this situation leave the balance
switched on for several minutes in order to adjust its internal temperature.
If none of above causes of inaccuracy occurs, calibration with external weight
should be performed to the balance. Recommended external calibration weight
(to buy for additional charge) is given in technical data table. In order to
calibrate the balance with external weight in legally verified balances
verification seals should be removed and another legal verification should be
performed. In this case it is recommended to contact authorised service centre.
Calibration with external weight is described in details in chapter 14.5.
13. Connecting a computer, printer or label printer
The scale is equipped with RS232C,
which can be used to connect external
devices such as computer or a printer.
When cooperating with computer, the
scale sends weighing result after initialize
signal from computer or after pressing
key on the scale.
When cooperating with a printer data is
send
automatically
after
result
stabilisation, but next transmission is
possible
after
removing
previously
weighted sample.
When cooperating with label printer after pressing
key, the scale sends
instructions set for the label printer. Label number 0001, hour, data (if the clock
1
6
2
7
3
8
4
9
5
RxD (receive)
TxD (transmission)
GND
+5V(option)
housing
RS232C