Calibration
Chapter 5
5-6
R
ESET
C
ALIBRATION
Cal Reset sets the gain factors of the A/D amplifier to minimum values and clears the A/D's zero offset.
These gain values are stored in the Information Parameters at P61104 → P61107 (see the Calibration
Parameters section). A Cal Reset should be performed if calibration is not possible due to an over-load
condition, or if the displayed weight value does not change when the test weight is applied.
To perform a Calibration Reset:
1. Access the calibration mode as described on page 5-2.
2. Select the Cal Reset calibration method as described in Calibration Methods on page 5-2.
3. Press [ENTER] at the “Cal Reset” prompt reset the A/D amplifier.
4. The display prompts “New Zero?”. Proceed with calibration.
5. Once the calibration is accepted, 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 -
6. 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.
K
NOWN
L
OADCELL
O
UTPUT
Known LCOut is used to calibrate without test weights. The exact full scale mV/V rating must be known for
each load cell. All load cells must be of the same full scale capacity. This procedure works best for hopper
scales where weight is evenly distributed and signal trimming is not required.
To perform a Known Loadcell Output calibration:
1. Access the calibration mode as described on page 5-2.
2. Select the Known LCOut calibration method as described in Calibration Methods on page 5-2.
3. Press [ENTER] at the Known “LCOut” prompt to display #of LC.
The number of load cells specified during the last calibration will also be displayed. A value of zero
(0) indicates that this calibration method has not yet been performed.
4. Key in the number of load cells (8 maximum) and press [ENTER].
- or -
Press [ENTER] to accept the displayed value.
5. The display prompts “LC#x mVv” (where 'x' is the load cell number) and then shows the mV/V value (0.1
→ 5.0) last entered for this load cell.
6. Key in the load cell's mV/V value and press [ENTER].
- or -
Press [ENTER] to accept the displayed value.
7. Steps 5-6 will be repeated for as many load cells as specified in step 4.
8. The display prompts LC FS showing the value last entered for the load cell full scale.
9. Key in the full scale capacity for the load cell(s) and press [ENTER].
- or -
Press [ENTER] to accept the displayed value.
10. The display briefly shows “Updtg” Gains as it updates the gain values, then prompts “CurWt Zero?”.
11. Press [ENTER] to establish the current input signal as the zero reference.
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