Rice Lake 880 Performance Series Indicator/Controller Technical/Service Manual - Manual (Page 65)

Calibration 59
4.1.1 Five-point linearization
Five-point linearization (using the WLIN parameter) provides increased scale accuracy by calibrating the indicator
at up to five additional points between the zero and span calibrations. 
Linearization is optional: if choosing not to perform linearization, skip the
WLIN
parameter; if linearization values
have previously been entered, these values are reset to zero during calibration of
WZERO
. To perform linearization,
follow the procedure below.
Note
The linearity points must be less than the WSPAN point.
1. With
WLIN
displayed, press TARE to go to the first linearization point (
POINT1
).
2. Press again,
WGT1
is displayed.
3. Press to edit the value:
• Press or to select the digit.
• Press or to increment or decrement the value.
• Press TARE when the value is correct (the decimal point will be set in the following step).
• Press or to move the decimal point position.
• Press TARE when the value is correct. The indicator will display
CAL1
.
4. Place test weights on the scale and press
TARE
. The indicator will display the previously captured A/D
counts for the linearization point.
5. Press
TARE
again to calibrate. The indicator displays
Calibrating, Please Wait
while calibration is in
progress. When complete,
WGT1
is displayed.
6. Press to
POINT1
, then press to
POINT2
.
7. Repeat for up to five linearization points. To exit the linearization parameters, press to return to
WLIN
.
4.1.2 Rezero
The rezero function is used to remove a calibration offset when an apparatus is used to hang the test weights. If no
other apparatus was used to hang the test weights during calibration, remove the test weights and press to return
to the
CALIBR
menu.
1. With
REZERO
displayed, press
TARE
or to access the rezero function.
2. If an apparatus is used during calibration, remove it and the test weights from the scale. The indicator will
display the AD count from the previous zero (
WZERO
) calibration.
3. With all weight removed, press
TARE
to rezero the scale. This function acquires a new ZERO calibration
value. The indicator displays
Calibrating, Please Wait
while the zero and span calibrations are adjusted.
When complete,
LAST
is displayed.
Note
For more information on LAST or TEMP see Section 4.2 or Section 4.3.
4. Press MENU to return to weigh mode.