More About Calibration; Adjusting Final Calibration; Zero Deadload A/D Counts - Rice Lake IQ PLUS 710 Installation Manual

4.4

More About Calibration

The following topics provide additional information
about compensating for environmental factors
(Section 4.4.1) and checking the calibration of an
indicator with no attached scale (Section 4.4.2).
4.4.1

Adjusting Final Calibration

Calibration may be affected by environmental factors
including wind, vibration, and angular loading. For
example, if the scale is calibrated with 1000 lb, a
strain test may determine that at 2000 lb the
calibration is 3 lb high. In this case, Þnal calibration
can be adjusted by tweaking WVAL to 998.5 lb. This
adjustment provides a linear correction of 1.5 lb per
1000 lb.
To adjust the Þnal calibration, return to the
prompt and press to show the test weight value.
Press or to adjust calibration up or down. Press
to save the value, then press
CALIBR menu.
4.4.2
Table 4-1 lists the ideal A/D counts that result from
input signals of 0Ð45 mV with zero deadload. Actual
values will typically be higher than the values shown
in Table 4-1 but the ideal values can be used when
calibrating the indicator with no attached scale.
WVAL
to return to the

Zero Deadload A/D Counts

Input Signal (mV) Raw A/D Count
0
1
2
3
4
5
6
7
8
9
10
15
20
30
45 1 050 000
Table 4-1. Ideal A/D Raw Counts
105 000
126 000
147 000
168 000
189 000
210 000
231 000
252 000
273 000
294 000
315 000
420 000
525 000
735 000
Calibration 39