Sonel CMM-60, User Manual

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CMM-60
– USER MANUAL
50
6 Measurements
The content of this chapter should be thoroughly read and understood since it describes methods
of measurements and basic principles of interpreting measurement results.
6.1 Voltage measurement up to 1000 V
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 sim-
ultaneous 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.
NOTE
Do not measure the voltage when an electric motor located within the circuit is being switched
on or off. Resulting voltage spikes may damage the meter.
6.1.1 Performing the measurement
To perform voltage measurement:

set the rotary switch at V ,

select MENU and use arrows and F1 F2 F3 F4 buttons to set the measurement of:

direct current voltage VDC,

alternating current voltage VAC (default setting),

connect black test lead to COM terminal and red test lead to V
Ω
CAP Hz% Temp terminal,

contact the tips of test probes to the points of measurement; red probe should be applied to the
point of higher potential,

read the measurement result on the display,

after completing the measurements, remove test leads from the terminals of the meter.
6.1.2 Voltage measurement in dB
For range 1000 V , the meter may display the result of measurement as the attenuation expressed in
decibels (dB), in the form of:

the reference to 1 V ( dBV mode)

the reference to 1 mW ( dBm mode),

the reference to a value set by the user.
For this purpose:

set the rotary switch at V ,

select MENU and use arrows and F1 F2 F3 F4 buttons to set dBV or dBm .

connect black test lead to COM terminal and red test lead to V
Ω
CAP Hz% Temp terminal,

contact the tips of test probes to the points of measurement; red probe should be applied to the
point of higher potential,

read the result of the measurement
– the main result is expressed in V and its equivalent is ex-
pressed in dB.