ALE-NC series operation manual 8
Controlling and adjustment functions
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69
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8-4
Maintenance settings
8-4-1
Span adjustment and span test
Span adjustment is to “decrease” the difference between an indicated value and the true value (mass),
and span test is to “check” the difference between an indicated value and the true value.
This must be performed without fail in the case of doing high-accuracy weighing work.
Because an electronic balance is affected by the acceleration of gravity, adjustment/test is needed at
every weighing location. The adjustment/test is also needed when (1) using a long period and (2) an
accurate indication does not appear any longer.
(1) An external weight used for the span adjustment shall be the one equivalent to the OIML F1
class.
(2) The span adjustment significantly affects the weighing accuracy. Please read this procedure
carefully before getting to the adjustment.
8-4-1(1)
Span adjustment with external weight
This mode is available only before verification.
1
Select the span adjustment with external weight.
Press [Menu] key, then press
[F1]-[F4] keys to go to
<631 EX CAL>.
Press [F4] key to execute.
2
Select a weight used for the span adjustment.
Press [F1]/[F2] key and select a
weight used for the span adjustment.
(Refer to List of “weights used for the
span adjustment by model”)
Press [F4] key to fix.
3
Zero-point adjustment starts.
Display changes to the order of <on 0>
→
“blinking of <on 0>”.
On completion of the zero-point
adjustment, the display automatically
changes to <on FS>.
4
The span adjustment starts.
Place the weight on the center of the
weighing pan.
Display changes to the order of <on FS>
→
“blinking of <on FS>” and span
adjustment starts.
On completion of the span adjustment
the display automatically changes to
<631 EX CAL>.
Unload the weight from the weighing pan.
5
Exit the setting menu.
Press [Menu] key to shift to the
measuring mode.
