Rice Lake 920i Installation Manual V3.10 - Manual (Page 58)

52 920i Installation Manual
4.0 Calibration
The 920i can be calibrated using the front panel, serial commands, or iRev . Each method consists of the following
steps:
• Zero calibration
• Entering the test weight value
• Span calibration
• Optional five-point linearization
• Optional rezero calibration for test weights using hooks or chains
The following sections describe the calibration procedure for each of the calibration methods. See the
iQUBE
Installation Manual, PN 77224, for information about configuring
iQUBE
-attached scales.
Figure 4-1. Calibration (CALIBR) Submenu
4.1 Gravity Compensation
Gravity compensation for latitude and elevation is available for the
920i
. To calibrate with gravity compensation,
the LOCALE parameter under the FEATURE menu must be set ON, and the LATUDE (latitude) and ELEVAT
(elevation, in meters) parameters set before calibrating the indicator (see Figure 3-11 on page 39).
If the indicator is later installed at a different location, gravity compensation can be applied to a pre-calibrated
indicator by adjusting the LATUDE and ELEVAT parameters.
4.2 Front Panel Calibration
The CALIBR submenu (under the SCALES menu,
see Figure 4-2) is used to calibrate the
920i
. The zero,
span, and linear calibration point displays provide a
set of softkeys used specifically for calibration
procedures:
+/–
Toggles to allow entry of negative or
positive values
Last Zero
Recalls the last established zero value
to allow calibration without removing
tests weights or product from scale.
Calibrate
Performs calibration for the selected
point
Temp Zero
Temporarily zeroes the displayed
weight of a non-empty scale. After span
calibration, the difference between the
temp zero and the previously calibrated
zero value is used as an offset.
Millivolts
(or
Counts
)
Toggles between display of captured A/
D counts and captured millivolts
values; allows entry of calibration
values in mV or counts
SCALES SERIAL FEATURE PFORMT SETPTS DIG I/O VERS
SCALE 1
CALIBR
WZERO WVAL WSPAN WLIN REZERO
POINT 4 POINT 5 POINT 1 POINT 2 POINT 3