Rice Lake 820i Programmable Indicator/Controller - Installation Manual - Manual (Page 52)

48 820i Installation Manual
4.0 Calibration
The
820i
can be calibrated using the front panel, serial commands, or
Revolution
®. 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.
SCALES SERIAL FEATURE PFORMT SETPTS DIG I/O ALGOUT VERS
SCALE 1
CALIBR
WZERO WVAL WSPAN WLIN REZERO
POINT 4 POINT 5 POINT 1 POINT 2 POINT 3
DISPLAY
Figure 4-1. Calibration (CALIBR) Submenu
4.1 Gravity Compensation
Gravity compensation for latitude and elevation is available for the 820i . 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 35).
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
820i
.
05/24/2006 02:57PM
Calibrate
WZERO WVAL REZERO
1291
Deadload Calibration
+/- Millivolts
Zero Count =>
Last Zero Temp Zero
Figure 4-2. WZERO Calibration Display
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