25
Measuring Current
1. Set the range switch to desired µ
A
,
mA
or
A
range.
If the magnitude of the current to be measured is not
known beforehand, select the highest range and then
reduce it range by range until satisfactory resolution is
obtained.
2. Press "
Select
" button to select dc or ac measurement.
3. Connect the black test lead to the "COM" jack. If the
current to be measured is less than 600mA, connect
the red test lead to the "µA/mA" jack. If the current is
between 600mA and 20A, connect the red test lead to
the "A" jack instead.
4. Turn off power to the circuit which you will measure.
Discharge all capacitors of the circuit.
5. Break the circuit path to be measured, connect the test
leads in series with the circuit.
6. Turn on power to the circuit, then read the display.
For dc current measurement, the polarity of the red test
lead connection will be indicated as well.
7. In the ac measurement mode, you can press the "
"
button to make the display show "Hz" and then measure
the frequency. It means that you don't have to set the
range switch to the "
Hz/Duty
" position for frequency
measurement. Press the "
" button twice to restore
the meter to ac current function.
