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14 Calibration and Span Test for the Balance
Span Adjustment
An electronic balance, which is influenced by the acceleration of gravity, indicates different values
depending on the location it is used. For this reason, you should calibrate your balance every time
you relocate it. You should also calibrate it after a long time of no use or when it does not indicate
correct values.
To calibrate a balance is called span adjustment, which is required for highly accurate
measurements.
Span Test
The span test is used to check the amount of offset in the span of the balance with respect to the
reference weight. Performing this function will not calibrate the balance.
* To adjust the span or perform a span test, wait at least five minutes after the power is turned on.
Select [8. CA. *] in Function 1 to set the span adjustment and conduct a span test. When the
GLP compatible item is set to [F. GLP 1] and [F1.out 1], the results will be output in a
GLP-compatible format. Refer to Section 18.2: “Outputting calibration results” on page 69 for
further information.
14.1 Span Adjustment with Built-In Weights
1. Press
the
Cal key.
[Aut. CAL]is displayed.
2. When [PuSH C] is displayed, press the Cal key again.
The built-in weight unit starts to operate, and the balance will automatically start span
adjustment.
The display changes in the order of [Aut. CAL]
→
[CH. 0]
→
[CH. F.S.]
→
[buSy]
→
[End.].
When span adjustment is completed, the display returns to normal.
14.2 Span Adjustment with External Weight
1. Press
the
Cal key.
[CAL EXt] is displayed.
2. When [PuSH C] is displayed, press the Cal key again.
The display first indicates [CAL EXt]
→
[on 0], and the balance starts adjusting the
zero-point.
(If a weight error is used, the corresponding weight error entered will be displayed for
about two seconds.)
3. When [on F.S.] is displayed, put a weight on the pan.
The balance starts adjusting the weighing capacity.
The display indicates [buSy]
→
[End.] in sequence. When
span adjustment is completed, the balance goes back to
the normal display.
*This function is available only with the HTR series.