UNI-T UT151A, Operating Manual

Page: 8 / 11

3-1 Measurement of DC voltage
1. Insert the black pen into the COM hole and the red pen into the V hole.
2. Place the functional switch at range scope; and connect the test pen to the power or load to
be tested. Polarity of the terminal connecting with the red pen will be shown at the same
time.
Notice
1) If the scope of voltage to be tested is not known, the functional switch shall be placed at the
maximum range which will be gradually lowered for testing.
2) If the display only shows
1 , it indicates over-range. In this case, the functional switch
shall be placed at higher range.
3)
indicates that you must not input a voltage more than 1000 V. It is possible to show a
higher voltage, but it has a risk of damaging the internal circuits.
4) Special attention shall be given to measurement of high voltage to avoid electric shock.
3-2 Measurement of AC voltage
1. Insert the black pen into the COM hole and the red pen into the V hole.
2. Place the functional switch at V~ range scope; and connect the test pen to the power or load
to be tested.
Notice
1) Refer to Notice 1, 2 and 4 in the AC Voltage Measurement
2)
indicates that you must not input a voltage more than 750 V. It is possible to show a
higher voltage, but it has a risk of damaging the internal circuits.
1. Insert the black pen into the COM hole. When the current for which the maximum value is
below 200 mA is measured, insert the red into mA hole. When the current for which the
maximum value is 10 A is measured, insert the red pen into 10 A hole.
2. Place the functional switch at range; and connect test pen to the circuit of load to be tested
in series. The polarity of red pen will be displayed together with the current.
3-3 Measurement of direct current
Notice
1) If the scope of current to be tested is not known, the functional switch shall be placed at the
maximum range which will be gradually lowered for testing.
2) If the display only shows
1 , it indicates over-range. In this case, the functional switch
shall be placed at higher range.
3)
indicates that the maximum input current is 200Ma. The built-in fuse of 200mA/250V
Ö5 x 20 mm can effectively protect the circuit from burn-out. 10A range use fuse of 10A/250V
Ö
6 x 25 mm for protection.
3-4 Measurement of alternating current
1. Insert the black pen into the COM hole. When the current for which the maximum value is
below 200 mA is measured, insert the red into mA hole. When the current for which the
maximum value is 10 A is measured, insert the red pen into A hole.
2. Place the functional switch at A~ range; and connect test pen to the circuit of load to be
tested in series.