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D. AC Current Measurement (see figure 4)
Warning
Never attempt an in-circuit current measurement
where the voltage between terminals and ground is
greater than 60V.
If the fuse burns out during measurement, the Meter
may be damaged or the operator himself may be hurt.
Use proper terminals, function, and range for the
measurement. When the testing leads are connected
to the current terminals, do not parallel them across
any circuit.
The measurement ranges of AC current are: 200.0µA,
2.000mA, 20.00mA, 200.0mA and 10.00A.
To measure current, do the following:
1. Turn off power to the circuit. Discharge all high-
voltage capacitors.
2. Insert the red test lead into the µAmA or 10A
terminal and the black test lead into the COM terminal.
3. Set the rotary switch to an appropriate measurement
position in A range.
Measurement Operation(6)
black red
( figure 4)
Model UT90A: OPERATING MANUAL
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