Rice Lake 920i USB Installation Manual V5.05 - Manual (Page 62)

56 920i Installation Manual
4.0 iRev 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.
WZERO WVAL WSPAN WLIN REZERO
POINT 4 POINT 5 POINT 1 POINT 2 POINT 3
VISIBLE GRADS FORMAT CALIBR
… …
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 3-13 on page 44).
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