Rice Lake 920i Installation Manual V4.01 - Manual (Page 61)

Calibration 55
4.0 Calibration
The 920i can be calibrated using the front panel, serial commands, or iRev 4 . 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 2
Installation Manual, PN 106113, for information about configuring iQUBE 2 -attached scales.
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
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 42).
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.