Measuring ac or dc current – Fluke 87 V User Manual
80 Series V
Measuring AC or DC Current
To avoid possible electric shock or personal
injury, never attempt an in-circuit current
measurement where the open-circuit
potential to earth is greater than 1000 V. You
may damage the Meter or be injured if the
fuse blows during such a measurement.
To avoid possible damage to the Meter or to
the equipment under test:
Check the Meter's fuses before
Use the proper terminals, function, and
range for all measurements.
Never place the probes across (in
parallel with) any circuit or component
when the leads are plugged into the
To measure current, you must break the circuit under
test, then place the Meter in series with the circuit.
The Meter's current ranges are 600.0
60.00 mA, 400.0 mA, 6000 mA, and 10 A. AC current is
displayed as an rms value.
To measure current, refer to Figure 8 and proceed as
1. Turn off power to the circuit. Discharge all high-
2. Insert the black lead into the COM terminal. For
currents between 6 mA and 400 mA, insert the red
lead into the mA/
A terminal. For currents above
400 mA, insert the red lead into the A terminal.
To avoid blowing the Meter's 400 mA fuse, use
A terminal only if you are sure the
current is less than 400 mA continuously or less
than 600 mA for 18 hours or less.