UNI-T UT58D Operating Manual page 16

Model UT58D: OPERATING MANUAL
Measurement Operation(3)
Warning
Never attempt an in-circuit current measurement
where the open circuit voltage between terminals
and ground is greater than 60V DC or 30V rms.
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 DC Current Measurement has 3 measurement
positions on the rotary switch: 2mA, 200mA and 20A
The AC Current Measurement has 3 measurement
positions on the rotary switch: 2mA, 200mA and 20A
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 20A or mA input
terminal and the black test lead into the COM terminal.
When you measure current below 200mA, please insert
the red test lead into the mA input terminal. When you
measure 200mA or above, insert the red test lead into
the 20A input terminal.
3. Set the rotary switch to an appropriate measurement
position in A
4. Break the current path to be tested. Connect the red
test lead in serial to the more positive side of the break
and the black test lead to the more negative side of
the break.
5. Turn on power to the circuit.
The measured value shows on the display.
or A range.
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