Chapter II
24
DMM230
1. Set the function switch to the
VAC/Hz/%
position.
2. Insert the black test lead banana plug into the negative COM
terminal.
Insert red test lead banana plug into the positive
+ terminal.
3. Apply the test probes to the points of the circuits
to be tested.
4. Voltage measured is displayed on screen.
5. Press the
Hz%
key to display “
Hz
”.
6. Frequency measured is displayed on screen.
7. Press the
Hz%
key again to display “
%
”.
8. Duty cycle is displayed in percentage.
3.3 DC current measurements
Do not make 20 A current measurements for longer than 30 s.
Exceeding 30 seconds may cause damage to the multimeter
and/or the test leads.
1. Insert the black test lead banana plug into the
negative
COM
terminal.
2. For current measurements up to 6000µA DC,
set the function switch to the
µA
position and
insert the red test lead banana plug into the
µA/mA
terminal.
3. For current measurements up to 600mA DC,
set the function switch to the
mA
position and
insert the red test lead banana plug into the
µA/mA
terminal.
4. For current measurements up to 20A DC, set
the function switch to the
10A
position and
insert the red test lead banana plug into the
10A
terminal.
5. Press the
MODE
key to display “
DC
” on screen.
6. Remove power from the circuit to be tested, then open the circuit
at the point where you wish to measure the current.
7. Apply test probes to the points of the circuit to be tested.
8. Apply power to the circuit.
9. Current measured is displayed on screen.
