User Guide

22
Measurement Operation(9)
( figure 8)
black red
Model UT90C: OPERATING MANUAL
Note
l When Hz measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
D.AC & DC Current Measurement (see figure 9)
Warning
Never attempt an in-circuit current measurement
where the open-circuit voltage between the circuit
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 current measurement has 3 measurement positions
on the rotary switch: µA , A and mA .
TheµA has a 400.0µA and 4000µA range, with auto
ranging; the mA has a 40.00mA and 400.0mA range,
with auto ranging; A position has a 4.000A and 10.00A
range, with auto ranging.