25
Last Zero
Last Zero allows span re-calibration without removing the applied test weight. The last zero established
by pressing
from the weigh mode will be used as the zero reference. This procedure is especially
useful when performing routine tolerance checks on large capacity scales. A scale found to be out-of-
tolerance can be easily calibrated without having to remove the test weights to reestablish a zero reference.
TO PERFORM A LAST ZERO CALIBRATION:
1. Remove all weight from the scale.
2. Press
< to zero the scale in the weigh mode.
3. Apply the calibration test weight.
4. Access the calibration mode as described on page 23.
5. Select the Last Zero calibration method as described in Calibration Methods on page 23 .
6. Press
at the Last Zero? prompt to display the Keyin CalWT prompt.
7. Key in the calibration weight value in terms of the default calibration units and press
to
establish span.
8. After establishing span, CAL OK? is displayed suggesting that the calibration is acceptable, or
ReCal??? is displayed suggesting that the calibration procedure should be repeated.
Accept the calibration by pressing
at the CAL OK? prompt or K at the ReCal??? prompt.
- or -
Repeat the calibration by pressing
K at the CAL OK? prompt or at the ReCal??? prompt.
9. Once the calibration is accepted in step 6, press
at the ENTER=SAVE prompt and again at
the ENTER=EXIT prompt to save the new calibration and exit the calibration mode.
- or -
To exit the calibration mode without
saving the new calibration, press K at the ENTER=SAVE
prompt. Then press
at the ENTER=UNDO prompt and again at the ENTER=EXIT prompt
to exit the calibration mode.
If you choose to “undo” the calibration when exiting the setup mode, you will also undo
any unsaved changes made to the setup parameters.
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