What should I do if I cannot access the calibration menu?
If the calibration menu is selected while the calibration switch is not in the enabled position, the menu is replaced by the warning message 'Calibration Disabled'. The calibration enable switch on the rear panel protects the instrument calibration memory and must be set to ENABLE to access calibration mode.
From the official Fluke 8508A Reference Multimeter manual, page 7
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