UNI-T UT50A Operating Manual page 18

Model UT50A/B/C: OPERATING MANUAL
Measurement Operation(6)
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 Model UT50A: The AC current measurement has
5 measurement positions on the rotary switch: 200 A,
2mA, 20mA, 200mA and 20A.
The Model UT50B/UT50C: The AC current measurement
has 3 measurement positions on the rotary switch: 20mA,
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 AmA (The Model
UT50A) or mA (The Model UT50B/UT50C) or 20A
terminal and the black test lead into the COM 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 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.
Note
l
If the value of current to be measured is unknown,
use the maximum measurement position (20A) and
20A terminal and reduce the range step by step until
a satisfactory reading is obtained.
l
When current measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
range.
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