Measuring Dc Or Ac Current - Fluke 88 V User Manual

Model 88 V
Users Manual

Measuring DC or AC Current

XWWarning
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.
XWCaution
To avoid possible damage to the Meter or to
the equipment under test:
•
Check the Meter's fuses before
measuring current. See Testing the Fuse
later in this manual.
•
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 current
terminals.
To measure current, you must break the circuit under test,
then place the Meter in series with the circuit.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
24
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The Meter's current ranges are 600.0 µA, 6000 µA,
60.00 mA, 400.0 mA, 6000 mA, and 10 A.
To measure current, refer to Figure 7 and proceed as
follows:
1. Turn off power to the circuit. Discharge all high-
voltage capacitors.
2. Insert the black lead into the COM terminal. For
currents between 6 mA and 400 mA, insert the red
lead into the mA/µA terminal. For currents above
400 mA, insert the red lead into the A terminal.
Note
To avoid blowing the Meter's 400 mA fuse, use
the mA/ µ 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.
3. If you are using the A terminal, set the rotary switch to
mA/A. If you are using the mA/µA terminal, set the
rotary switch to µA for currents below 6000 µA
(6 mA), or mA/A for currents above 6000 µA.
4. To measure ac current, press
A.