Rice Lake 920i Installation Manual V1.05 - Manual (Page 44)

40 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 Þve-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.
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 3-8 on page 32).
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 speciÞcally for calibration
procedures:
Default Restores the value to its default
+/– Toggles to allow entry of negative or
positive values
Calibrate Performs calibration for the selected
point
Millivolts (or Counts )
Toggles between display of captured
A/D counts and captured millivolts
values; allows entry of calibration
values in mV or counts
Restore Restores the value to the previously
saved value Figure 4-2. WZERO Calibration Display
SCALES SERIAL FEATURE PFORMT SETPTS DIG I/O ALGOUT VERS
SCALE 1
CALIBR
WZERO WVAL WSPAN WLIN REZERO
PT->4 PT->5 PT->1 PT->2 PT->3