ENGLISH
34
AC voltage measurement
WARNING!
To avoid electric shock, injury or damage to the instrument, do not try to measure a DC
voltage above 1000 volts or 750 volts RMS, even if a reading can be obtained.
The AC voltage measurement ranges are: 200mV, 2V, 20V, 200V and 750V.
To take an AC voltage reading, connect the instrument as follows:
1.
Connect the red test lead to the terminal
and the black test lead to the
COM
terminal.
2.
Set the mode selector to
.
3.
Connect the test leads across the object being measured. The reading is shown on the display as
the effective value of the sine wave (average value).
Notes
If you do not know the approximate value of the reading you are taking, take a reading at the
highest range (750V) then switch progressively to lower ranges until a suitable reading is obtained.
"
1
" is displayed if the selected range is overloaded. You must select a higher range to obtain a
correct reading.
The instrument has an input impedance of 10 M
Ω
in each measuring range. This loading can
cause measurement errors in high-impedance circuits. If the circuit impedance is equal to or less
than 10 k
Ω
, the error is negligible (0.1% or less).
When AC voltage measurement has been completed, disconnect the connections between the test
leads and the object being measured.
DC current measurement
WARNING!
Never attempt to take a current measurement in a circuit where the open-circuit potential
between the terminals and earth is greater than 60 volts DC or 30 volts rms. If the fuse blows during such
a measurement, there is a risk of injury to the user and damage to the instrument. Use the correct
terminals, function, and range for the measurement. Never connect the test leads in parallel across any
object being measured when the test leads are connected to the current terminals.
The DC current measurement ranges are: 20
μ
A, 2 mA, 200 mA and 20 A.
To take a DC current reading, connect the instrument as follows:
1.
Disconnect all power to the object being measured and discharge all high-voltage capacitors.
2.
Connect the red test lead to the
μ
AmA
terminal (UT50B/UT50C) or the
20A
terminal and the black
test lead to the
COM
terminal.
3.
Set the mode selector to a suitable measurement range (
).
4.
Break the current path to be tested. Connect the red test lead to the more positive side of the
current path and the black test lead to the more negative side.
5.
Turn on power to the circuit. The reading is shown on the display.
Notes
If you have no idea of the value of the reading you are taking, start at the highest measurement
position (20A) and the
20A
terminal and then switch progressively to lower ranges until a suitable
reading is obtained.
When DC current measurement has been completed, disconnect the connections between the test
leads and the object being measured.
AC current measurement
WARNING!
Never attempt to take a current measurement in a circuit where the open-circuit potential
between the terminals and earth is greater than 60 volts. If the fuse blows during such a measurement,
there is a risk of injury to the user and damage to the instrument. Use the correct terminals, function, and
range for the measurement. Never connect the test leads in parallel across any object being measured
when the test leads are connected to the current terminals.
The AC current measurement ranges are: 200A, 2mA, 20mA, 200mA and 20A.
To take an AC current reading, connect the instrument as follows:
1.
Disconnect all power to the object being measured and discharge all high-voltage capacitors.
2.
Connect the red test lead to the
AmA
terminal (UT50A) or the
mA
terminal (UT50B/ UT50C) or the
20A
terminal and the black test lead to the
COM
terminal.
3.
Set the mode selector to a suitable measurement range (
).
4.
Break the current path to be tested. Connect the red test lead to the more positive side of the
current path and the black test lead to the more negative side.
5.
Turn on power to the circuit. The reading is shown on the display.