UNI-T UT231 Operating Manual page 16

The AC Voltage ranges are:
15V, 100V, 300V and 600V
The frequency range is:
20Hz~500Hz
Warning
When the voltage input is higher than 30V, the
display shows to warn you to take extra care
of safety.
When the input voltage is higher than 600V
(r.m.s.), the display shows OL.
To measure AC voltage + frequency, connect the Meter
as follows:
Insert the red test lead into the V terminal and black
1.
test lead to the COM input terminal.
Press the MENU to select Voltage (main display)
2.
+ Frequency (secondary display) range and connect
the two test leads to the object being measured.
The double display shows the AC voltage True
3.
RMS value and the frequency value.
14
Model UT231: OPERATING MANUAL
Press MAX/MIN once, the LCD displays MAX, it
4.
starts recording the maximum AC voltage True RMS
value.
Press MAX/MIN again, the LCD displays MIN, it
5.
starts recording the minimum AC voltage True RMS
value.
Press MAX/MIN again to show the present AC
6.
voltage True RMS value.
The display shows OL when the input voltage is
7.
higher than 600V (r.m.s).
Note
When the measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test and remove testing leads
from the input terminals.