Clas Ohlson UT33D - Operating Instructions; Voltage Measurement

6
English
Operating instructions
Warning!
• Before measuring voltage, always ensure that themeter is set to thecorrect
function range and not set to current, resistance or diode test measurement.
Alwaysensure that you use thecorrect test lead socket for thetype of
measurement to bemade.
• Use extreme caution when measuring voltages over 60 V, especially when
thecircuit being measured has ahigh power output.
• Make sure that thecircuit to be measured is not “live”, i.e. conducting any current,
before connecting test leads in series with it (such as when measuring current).
• Make sure that thecircuit to be tested is not conducting any current before
performing resistance measurements or diodetests.
• Always ensure that thecorrect function and range are selected. Ifin doubt about
thecorrect range, start with thehighest and work downwards.
• Take extreme care when using themeter on aninductive component such
as atransformer, relay coils and thelike. Highvoltage may be induced at
themeasuring points if anopen circuit occurs.
• Make sure that thetest leads are in good condition with no damage to theinsulation.
• If you replace thefuse, make sure that it is thecorrect type and rating.
Voltage measurement
Check thebattery by rotating themultifunction selector to anew measuring function.
Thebattery symbol will appear if thebattery starts to runlow.
1. Connect theblack test lead to
and
thered test lead to .
2. Setthefunction selector to
(200/250 V~) or (200 mV – 250 V)
and therequired measuring range for
voltage measurement.
3. Connect thetest leads across thevoltage
source to be measured. Readthevalue.
Note: Iftheincorrect polarity is connected
when measuring DC voltages, thedisplay will
show
(minus) before thereading.
Note:
In each range, themeter has aninput impedance of 10 MΩ except themV range,
which has aninput impedance of 3000 MΩ. Thiscan cause measurement errors in
high impedance circuits. Ifthecircuit impedance is less than or equal to 10 kΩ,
theerror is negligible (0.1 % or less).