Technical data

U1270 Series Service Guide V

WARNING

• Do not apply more than the rated voltage (as marked on the

multimeter) between terminals, or between the terminal and

earth ground. Before use, verify the multimeter's operation by

measuring a known voltage.

• Never use the multimeter in wet conditions or when there is

water on the surface. If the multimeter is wet, ensure that the

multimeter is dried only by trained personnel.

• When measuring current, turn off the circuit power before

connecting the multimeter in the circuit. Remember to place the

multimeter in series with the circuit.

• Apply caution when working above 60 V

, 30 V

AC (RMS)

, or

42.4 V

PEAK

. Such voltages pose a shock hazard.

• Be aware of the presence of hazardous voltage before using the

Low Pass Filter (LPF) function for voltage measurement. Voltages

measured are usually greater than what are indicated on the

multimeter as the voltages with higher frequencies have been

filtered through the LPF function.

• Do not use the Z

LOW

(low input impedance) function (U1272A,

U1273A, and U1273AX only) to measure voltages in circuits that

could be damaged by this function’s low input impedance of 2 k

Ω.

• When using the probes, keep your fingers behind the finger

guards on the probes.

• Connect the common test lead before you connect the live test

lead. When you disconnect the leads, disconnect the live test lead

first.

• Remove the test leads from the multimeter before you open the

battery cover. Do not operate the multimeter with the battery

cover or portions of the cover removed or loosened. When

servicing the multimeter, use only the specified replacement

parts.

• To avoid false readings, which may lead to possible electric shock

or personal injury, replace the battery as soon as the low battery

indicator appears and flashes.