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Measuring AC or DC Current
Never attempt an in-circuit current measurement where the open-circuit
WARNING
potential to earth is greater than 1000 V. Doing so will cause damage to the
multimeter and possible electric shock or personal injury.
To avoid possible damage to the multimeter or to the equipment under test:
CAUTION
– Check the multimeter's fuses before measuring current.
– Use the proper terminals, function, and range for your measurement.
– Never place the probes across (in parallel with) any circuit or component
To measure current, you must open the circuit under test, then place the
multimeter in series with the circuit.
To measure AC or DC current, proceed as follows:
1 Turn off power to the circuit. Discharge all high-voltage capacitors. Insert the
To avoid blowing the multimeter's 440 mA fuse, use the
NOTE
you are sure the current is less than 400 mA. See
connections and function selection. Refer to the
information on the alerts the multimeter uses when leads are not used correctly
for current measurements.
Keysight U1271A/U1272A User's Guide
when the leads are plugged into the current terminals.
black test lead into the
appropriate for the measurement range.
a If you are using the
b If you are using the
currents below 5000 μA (5 mA), or
terminal. Insert the red test lead in an input
terminal, set the rotary switch to
terminal, set the rotary switch to
for currents above 5000 μA.
Making Measurements
.
terminal only if
Figure 2-33
for test lead
Input warning
section for
2
for
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