Measurement Operation(6)
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 mA or 20A terminal and
the black test lead into the COM terminal.
3.
Set the rotary switch to an appropriate measurement
position in A range.
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.
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.
Model UT50D: OPERATING MANUAL
18
