Fluke 744 Fluke 744 Users Manual - Page 109

Internal Lithium Backup Battery A lithium battery maintains the memory contents and Setup settings. The normal service life for the lithium battery is 3 to 5 years. You cannot access the lithium battery. Return the calibrator to an authorized Fluke service center listed at the back of the manual if you need to replace the lithium battery. When the lithium battery is 3 years old, replace it at the next calibration interval as a preventive maintenance procedure. Cleaning the Calibrator Clean the calibrator and pressure modules with a soft cloth dampened with water or water and mild soap. Caution To avoid damaging the plastic lens and case, do not use solvents or abrasive cleansers. Documenting Process Calibrator Maintenance Calibration Data The date the calibrator was last calibrated shows on the calibration sticker and on the last screen in Setup mode. The CAL. STATUS number on the sticker should always match the Calibration Status number in the calibration s screen. Calibration of the 744 is to be done by qualified personnel. Refer to the 74X Series Calibration Manual (PN 602505). In Case of Difficulty If the calibrator operates abnormally, do not use it. Protection may be impaired. When in doubt, have the calibrator serviced. If the display is blank or unreadable, but the beeper works when you turn the calibrator on, make sure the contrast is not maladjusted. Press the u and d keys to adjust the contrast. 99