GSE 675 - Last Zero Calibration; Temporary Zero Calibration

Model 675 User Instructions 35
4.3.2 Last Zero
Last Zero allows span re-calibration without removing the applied test weight. The last
zero established by pressing [ENTER] 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.
1. Remove all weight from the scale.
2. Press [ZERO] to zero the scale in the weigh mode.
3. Apply the calibration test weight.
4. Access the calibration mode as described on page 33.
5. Select the Last Zero calibration method as described in Calibration Methods
on page 33.
6. Press [ENTER] 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 [ENTER] 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.
8a. Accept the calibration by pressing [ENTER] at the CAL OK? prompt or [CLR]
at the ReCal??? prompt.
- or -
8b. Repeat the calibration by pressing [CLR] at the CAL OK? prompt or [ENTER]
at the ReCal??? prompt.
9. Once the calibration is accepted in step 6, press [ENTER] at the
ENTER=SAVE prompt and again at the ENTER=EXIT prompt to save the new
calibration and exit the calibration mode.
- or -
9a. To exit the calibration mode without saving the new calibration, press [CLR] at
the ENTER=SAVE prompt. Then press [ENTER] at the ENTER=UNDO
prompt and again at the ENTER=EXIT prompt to exit the calibration mode.
4.3.3 Temporary Zero
Temp Zero is used to calibrate without establishing a new zero. Calibration can be
performed without removing the currently applied gross load. A temporary zero is
established so that test weights can be added during calibration. The original zero
reference determined during the previous calibration is not affected. This procedure is
commonly used to calibrate hopper scales where it is impractical to empty the product
before calibrating.
1. Access the calibration mode as described on page 33.
2. Select the Temp Zero calibration method as described in Calibration Methods
on page 33.