Front Panel Calibration - Rice Lake 520 Installation Manual

4.1

Front Panel Calibration

To calibrate the indicator using the front panel, do the
following:
1. Place the indicator in setup mode (display
reads ) and remove all weight from
CONFIG
the scale platform. If your test weights require
hooks or chains, place the hooks or chains on
the scale for zero calibration.
2. Press until the display reads
Figure 4-1). Press
( WZERO ).
3. With displayed, press
WZERO
zero. The indicator displays
calibration is in progress. When complete, the
A / D c o u n t f o r t h e z e r o c a l i b r a t i o n i s
displayed. Press
calibration value and go to the next prompt
( ).
WVAL
NOTE: If millivolt calibration is enabled, press
ENTER to display and edit millivolt value at zero
weight, press ENTER again to calibrate and display
raw A/D count, press ENTER the third time to move
to the next selection.
4. With displayed, place test weights on
WVAL
the scale and press
value. Use the procedure shown in Figure 4-2
to enter the actual test weight, then press
save the value and go to span calibration
( ).
WSPAN
5. With displayed, press
WSPAN
span. The indicator displays
calibration is in progress. When complete, the
A / D c o u n t f o r t h e s p a n c a l i b r a t i o n i s
displayed. Press
calibration value and go to the next prompt
( ).
WLIN
NOTE: If millivolt calibration is enabled, press
ENTER to display and edit millivolt value at span
weight, press ENTER again to calibrate and display
raw A/D count, press ENTER the third time to move
to the next selection.
6. 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 you choose not to
perform linearization,
parameter; if linearization values have
previously been entered, these values are reset
to zero during calibration. To perform
linearization, follow the procedure below:
With WLIN displayed, Press
first linearization point (
weights on the scale and press
(see
CALIBR
to go to zero calibration
to calibrate
while
*CAL*
again to save the zero
to show the test weight
to
to calibrate
while
*CAL*
again to save the span
skip the WLIN
to go to the
). Place test
PT-> 1
or ENTER .
Use the procedure shown in Figure 4-2 to
enter the actual test weight value, then press
to calibrate. The indicator displays
ENTER
*CAL* while calibration is in progress. When
complete, the A/D count for the linear
calibration is displayed. Press
save the calibration value and go to the next
prompt ( ).
PT-> 2
0 0 0 0 0 0
When editing numeric values, press
digit selected. Press or
value of the selected digit. If a decimal point is required in value,
press to view and move decimal point. Press
move decimal position. Press
return to the level above.
Figure 4-2. Editing Procedure for Numeric Values
Repeat for up to five linearization points. To
exit the linearization parameters, press
return to WLIN.
NOTE: If millivolt calibration is enabled press
ENTER to display and edit the test weight value, press
ENTER again to display and edit the millivolt value
for that weight, press ENTER again to calibrate and
display the raw A/D count, press ENTER again to
move to the next calibration point.
7. The rezero function is used to remove a
calibration offset when hooks or chains are
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
the CALIBR menu.
• If hooks or chains were used during
calibration, remove these and the test
weights from the scale. With all weight
removed, press
function adjusts the zero and span
calibration values. The indicator displays
w h i l e t h e z e r o a n d s p a n
* C A L *
calibrations are adjusted. When complete,
the adjusted A/D count for the zero
calibration is displayed. Press
the value, then press
CALIBR menu.
8. Press until the display reads
press to exit setup mode.
again to
ENTER
or to change the
to increment or decrement the
or to
to save the value entered and
to
to return to
to rezero the scale. This
to save
to return to the
, then
CONFIG
Calibration 37