6 Keysight U1273A/U1273AX User’s GuideSafety ConsiderationsRead the information below before using this multimeter. The descriptions andinstructions in this manual apply to the Keysight U1273A/U1273AXHandheld Digital Multimeter (hereafter referred to as the multimeter).CAUTION – Disconnect circuit power and discharge all high-voltage capacitorsbefore testing resistance, continuity, diodes, or capacitance.– Use the proper terminals, function, and range for your measurements.– This device is for use at altitudes of up to 3,000 m.– Never measure voltage when current measurement is selected.– Always use the specified battery type. The power for the multimeter issupplied with four AAA 1.5 V batteries. Observe the correct polaritymarkings before you insert the batteries to ensure proper insertion of thebatteries in the multimeter.– You are advised to use low leakage batteries when changing to newbatteries. Please remember to remove the batteries when the multimeteris not in use for a long period of time. Warning on the risk of batteryleakage.WARNING – Do not exceed any of the measurement limits defined in the specificationsto avoid instrument damage and the risk of electric shock.– Do not use the multimeter if it is damaged. Before you use themultimeter, inspect the case. Look for cracks or missing plastic. Payparticular attention to the insulation surrounding the connectors.– Inspect the test leads for damaged insulation or exposed metal. Checkthe test leads for continuity. Replace damaged test leads before you usethe multimeter.– Do not operate the multimeter around explosive gas, vapor, or wetenvironments.– Do not apply more than the rated voltage (as marked on the multimeter)between terminals, or between terminal and earth ground.
