Keysight U1271A, Service Manual

Page: 5 / 63

Keysight U1270 Series Service Guide 5
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
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.