Reference Manual Rev 1.13
Page 84
004R-646-113
13. Calibration
The calibration of the indicator is fully digital. The calibration results are stored in
permanent memory for use each time the instrument is powered up.
Note: Some of the digital setup steps can affect calibration. The SCALE:BUILD and
SCALE:OPTION settings MUST be configured before calibration is attempted.
To perform a calibration, when in Full Setup select the
SCALE:CAL
menu.
The calibration programme will automatically prevent the instrument from being calibrated
into an application outside of its specification. If an attempt is made to calibrate outside of
the permitted range, an error message will display and the calibration will be abandoned.
Refer to Calibration Errors page 90.
Note: It should not be assumed that just because the instrument has successfully
calibrated a scale, that the scale is correct for trade use. Always check the scale
build against the approval specification.
13.1. Performing a Digital Calibration with Test Weights
0
500
1000
1500
2000
2500
3000
3500
0
2
4
6
8
10
Figure 11: Chart - Zero and Span Points to Interpolate Weight from Load Cell
The Zero setting (SCALE:CAL:ZERO) specifies a gross zero point for the scale.
The Span setting (SCALE:CAL:SPAN) specifies a second point
(preferably close
to full scale)
used to convert the A/D readings into weighing units (eg. kg). It is
important that an initial ZERO calibration is performed before any SPAN
calibrations. The chart shown here demonstrates how the zero and span points are
used to interpolate a weight reading from the load cell reading.
Notes:
1. Calibration points (Zero, Span and Linearisation) must be spaced
by at least 2% of Full scale from each other.
2. First span point must be 10% of full scale or greater for
successful calibration.
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