Span/Zero Find Adjust - CAS LP-II Service Manual

7 Calibrating the Scale
Place 60 lbs. on the platter. Once
the weight is stable, press ENTER
key. Then the scale checks
stability & the span weight. If the
SPAN calibration is successful, the
Calibration Passed screen will be
displayed temporarily and then
return to the Calibration screen.
If there is a problem, you will get the "Calibration Failed!" message and will go back to the Calibration
Menu screen. If you get this message, please check the following:
• You are using 60 lb of certified weights.
• The scale has prompted you for 60 lb and not 30 kg or any other capacity.
• The weight/counts were stable throughout the calibration process (+ 5 count ∆).
• There is nothing obstructing the platter & the platter is mounted properly onto the platform.
• You are using the correct platter and/or correct dead load (IZR* is 10% of capacity.)
• Try process again 2 more times always following the onscreen directions.
If problems persist, you may have a damaged: A/D Converter (90%).
If problems persist, you may have a damaged: Load Cell (5%).
Contact the CAS Service Department:
NOTE: Any changes made here will affect the NTEP Audit Trail counters (CAL counter only.)
*IZR: Initial Zero Range allows +10%-of-Capacity from Calibrated Zero point.
7.3 Span/Zero Fine Adjust
Once at the CAL Main
Menu screen, press the 2 key. The
display will read "Checking Load
Cell..." and then the Span Fine
Adjust screen will appear as
follows:
WEIGHT: The Weight display will be shown in calibrated units (lb if you calibrated in lb, kg if you
calibrated in kg.) The weight is in 1/60,000 resolution and updates a bit more slowly than in REG mode.
You can use this mode to verify different weigh points. Remember that the REG mode weight display
will round up to the nearest 1/3000 division.
SPAN: The Span value is the measurement in counts of the full load. Increasing the span will display
a lesser weight for a given mass; decreasing the span will display a greater weight for the same mass.
After you change the span value, while the cursor is on the Span field, you need to press the ENTER key
twice in order to refresh the weight display.
Calibration Passed!
< CAL: SPAN/ZERO FINE ADJUST >
SPAN: [ 74062]
ZERO: [ 3566]
WEIGHT: 0.000 lb
TEST = Weighing Mode
SAVE = SAVE,
22
Other (5%).
ESC= UNDO CHANGES
NUMERIC