34 Model 675 User Instructions
l Only Zero - Establishes a new zero reference without affecting span.
l Cal Reset - Adjusts the zero and gain factors of the A/D amplifier to default
values for maximum sensitivity.
l Known LCOut - Calibrates without the use of test weights. The mV/V value
and full scale capacity of each load cell must be known.
4.3.1 New Zero
The most common calibration procedure, New Zero establishes a new zero (no load)
and span (test load) calibration reference. Use this method for first-time calibration and
complete re-calibration.
1. Remove all weight from the scale.
2. Enter calibration as described on page 33.
3. Select the New Zero calibration method as described in Calibration Methods
on page 33.
4. Press [ENTER] at the New Zero? prompt to establish the new zero reference.
5. After establishing the zero reference, the default calibration units are displayed
momentarily followed by the Keyin CalWt prompt.
6. Apply the calibration weight, key in the calibration weight value in terms of the
default calibration units and press [ENTER] to establish span.
6a. If the calibration weight value was entered before the weight was applied, the
display will prompt Add CalWT. Add the calibration weight and press [ENTER].
7. 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.
8. Accept the calibration by pressing [ENTER] at the CAL OK? prompt or [CLR]
at the ReCal??? prompt.
- or -
8a. 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.
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