Measurements; Measurement Of Voltage - Sonel CMM-30 Manual De Uso

The content of this chapter should be thoroughly read and un-
derstood since it describes methods of measurements and basic
principles of interpreting measurement results.

5.1 Measurement of voltage

WARNING
 Electric shock hazard. The ends of measuring
probes, due to their length, may not reach the live
parts inside some network connections of low-
voltage electrical equipment, because the contacts
are arranged inside the sockets. In such a case, the
read-out will be 0 V with the simultaneous presence
of voltage in the socket.
 Before acknowledging the absence of voltage in the
socket make sure that the ends of the of the probe
touch the metal contacts inside the socket.
CAUTION!
Do not measure the voltage when an electric motor lo-
cated within the circuit is being switched on or off. Re-
sulting voltage spikes may damage the meter.
To perform AC voltage measurement:
 set the rotary switch at V
 in case of measuring voltage in mV shortly press MODE
until symbol mV is shown on the display,
 connect black test lead to COM terminal, and red test lead to
VΩHz%
 contact the tips of test probes to the points of measurement,
 read the measurement result on the display.

5 Measurements

Hz% ,
CAP ºC ºF terminal,
CMM-30 – USER MANUAL
button,
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