Sonel CMM-30, User Manual

Page: 56 / 116

CMM-30 – USER MANUAL
54
5.5 Circuit continuity test
WARNING
Do not perform measurements on the circuit under the
voltage. Before the measurement disconnect the pow-
er and discharge capacitors.
To perform the continuity test:

set the rotary switch at
Ω
,

connect black test lead to COM terminal, and red test lead to
V
ΩHz%
CAP
ºC ºF
terminal,

press MODE button, to display on the screen,

contact the tips of test probes to the points of measurement,

read the measurement result on the display; the beep will be acti-
vated when resistance values are below approx.
30 Ω
.
5.6 Diode test
WARNING
Do not perform measurements on the circuit under the
voltage. Before the measurement disconnect the pow-
er and discharge capacitors. Do not test the diode un-
der voltage.
To perform the diode test:

set the rotary switch at
Ω
,

connect black test lead to COM terminal, and red test lead to
V
ΩHz%
CAP
ºC ºF
terminal,

press MODE button, to display and V on the screen,

contact the tips of test probes to the diode. The red test probe
should contact the anode and the black should contact cathode,

read the test result on the display
– the forward voltage is dis-
played.

For a typical silicon rectifier diode, it is approx. 0.7 V, and for
a germanium diode it is approx. 0.3 V