Rice Lake 920i USB Installation Manual V5.05 - Manual (Page 63)

07/14/2006 01:57PM
Calibrate
WZERO WVAL REZERO
1291
Deadload Calibration
+/- Millivolts
Zero Count =>
Last Zero Temp Zero
CALIBR
SCALE1
SCALES
iRev Calibration 57
Figure 4-2. WZERO Calibration Display
To calibrate the indicator using the front panel:
1. Place the indicator in setup mode (display
reads Scale Configuration ) and remove all weight
from the scale platform. If your test weights
require hooks or chains, place the hooks or
chains on the scale for zero calibration.
2. With the SCALES menu highlighted, press the
down key, then select the scale to be calibrated.
P r e s s d o w n a g a i n ( G R A D S p a r a m e t e r
highlighted), then press left to highlight the
CALIBR submenu (see Figure 4-1). Press down
t o g o t o z e r o c a l i b r a t i o n ( W Z E R O ) . S e e
Figure 4-2 on page 57.
3. Ensure scale is empty, then press down again to
show the current WZERO value, then press the
Calibrate softkey to calibrate zero. When
complete, the new A/D count for the zero
calibration is displayed. Press
enter to save the
zero calibration value and go to the next
prompt (
WVAL ).
4. With WVAL displayed, press down to show the
stored calibration weight value. Use the
numeric keypad to enter the actual value of the
calibration test weights, then press
enter to
save the value and go to span calibration
(
WSPAN ).
5. Place test weights on scale. Press down again
to show the current WSPAN value, then press
the
Calibrate softkey to calibrate span. When
complete, the new A/D count for the span
calibration is displayed. Press
enter again to
save the span calibration value and go to the
next prompt (
WLIN ).
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, skip the WLIN
parameter; if linearization values have
previously been entered, these values are reset
to zero during calibration. WZERO and
WSPAN must be calibrated before adding
linearization points; WLIN values must be less
than the WSPAN value and must not duplicate
WZERO or WSPAN.
To perform linearization, follow the procedure
below:
With WLIN displayed, Press down to go to the
first linearization point ( POINT 1 ). Press down
again to show the weight value prompt ( WGT
1 ), then down once more to show the weight
value. Place test weights on the scale, then use
the numeric keypad to enter the actual test
weight value. Press
enter to save the value and
move to the calibration ( CAL 1 ) prompt. Press
down to show the current calibration value,
then press the Calibrate softkey to calibrate the
linearization point. When complete, the A/D
count for the linear calibration is displayed.
Press
enter again to save the calibration value
and go to the next prompt ( POINT 2 ).
Repeat for up to five linearization points. To
exit the linearization parameters, press the
up
key to return to WLIN.
7. The optional rezero function is used to remove
a calibration offset when hooks or chains are
used to hang the test weights.
Note
The rezero function cannot be used with
five-point linear calibration.
• If no other apparatus was used to hang the
test weights during calibration, remove the
test weights and press
up to return to the
CALIBR submenu.
• If hooks or chains were used during
calibration, remove these and the test
weights from the scale. With all weight
removed, go to the REZERO parameter,
then press
down to show the current zero
value. Press the Calibrate softkey to adjust
the zero and span calibration values. Press
e n t e r or u p to return to the CALIBR
submenu.
8. Press up to return to the SCALES menu, or
press the Save and Exit softkey to exit setup
mode.