26
(figure 4)
D. AC CURRENT MEASUREMENT
(see figure 4)
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 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 highvoltage 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
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.
Note
- 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.
- When current measurement has been completed, disconnect the connection between the
testing leads and the circuit under test.
