16-12 Calibration Model 6485 Instruction Manual
Locking out calibration
Use the following procedure to lock out calibration without saving new calibration con-
stants:
1. Press MENU, select CAL, then press ENTER. Use the up RANGE key to display
the following:
CAL: LOCK
2. Press ENTER. The instrument will display the following message:
CAL LOCKED.
Calibration support
Changing the calibration code
Follow the steps below to change the calibration code:
1. Press MENU, select CAL, then press ENTER. The instrument will display the fol-
lowing:
CAL: VOFFSET
2. Use the up or down RANGE key to display the following:
CAL: UNLOCK
3. Press ENTER. The instrument will prompt for the present calibration code:
CODE? 000000
4. Enter the present calibration code on the display. (Factory default: 006485.) Use
the up and down RANGE keys to select the letter or number, and use the left and
right arrow keys to choose the position. Press ENTER to complete the process and
the unit will display:
CAL ENABLED
Followed by:
NEW CODE? Y/N
5. Select Y, then press ENTER. The unit will prompt for the new code:
CODE? 000000
6. Enter the new code, then press ENTER.
7. Using the LOCK selection in the calibration menu, lock out calibration after
changing the code.
Resetting the calibration code
If you forget the calibration code, you can unlock calibration by shorting together the CAL
pads which are located on the display circuit board inside the unit. Doing so will also reset
the code to the factory default (006485).
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