Agilent Technologies U1270 Series, Service Manual

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U1270 Series Service Guide V
WA R N I N G
• 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
DC
, 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.