Fluke 28IIEX Fluke 28IIEx User Manual - Page 48

28 II Ex Users Manual Maintenance XWWarning To prevent electrical shock or personal injury, have the Product repaired by ECOM Instruments GmbH or an ECOM authorized service center to keep Product certification. General Maintenance To clean the external surfaces of the Product, wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the terminals can cause incorrect measurements and can falsely set off the Input Alert feature. Clean the terminals as follows: 1. Turn the Product off and remove all test leads. 2. Shake out dirt that can be in the terminals. 3. Soak a clean swab with mild detergent and water. Move the swab around in each terminal. Dry each terminal with canned air to push the water and detergent out of the terminals. It is recommended that the Product be calibrated by Fluke in two-year intervals. Fuse Test As shown in Figure 10, with the Product in the N function, put a test lead into the  jack and place the probe tip on the other end of the test lead against the metal of the current input jack. If "LEAd" appears in the display, the probe tip has been inserted too far into the amps input jack. Lift the lead out a bit until the message no longer shows in the display and OL or a resistance measurement shows in the display. The resistance value must be as shown in Figure 10. If the tests give measurements other than those shown, have the Product serviced. XWWarning To prevent electric shock or personal injury, remove the test leads and all input signals before you replace the batteries or fuses. To prevent damage or injury, install ONLY specified replacement fuses with the amperage, voltage, and speed ratings shown in Table 10. 38