18
The measurement ranges of DC current are: 200.0
µ
A,
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
µ
AmA
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.
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.
Measurement Operation(5)
Note
l
If the value of current to be measured is unknown,
use the maximum measurement position (10A) and
10A
terminal, and reduce the range step by step until
a satisfactory reading is obtained.
l
When DC current measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test.
Model UT90A: OPERATING MANUAL
