Clas Ohlson UT33D - Diode Testing; Continuity Measurement

8
English
Diode testing
1. Connect theblack test lead to and
thered test lead to .
2. Setthemultifunction selector to
for measuring diode threshold value (V).
3. Connect theblack test lead to thecathode
and red test lead to theanode of thediode
to be tested. Readtheforward voltage
drop value from thedisplay. If“1” appears
on thedisplay, reverse thepolarity of
thediode.
Warning!
Make sure that thecircuit to be tested is not conducting any current before testingdiodes.
Take extreme care when using this instrument on aninductive component such as
atransformer, relay coils and thelike, and make sure they have been discharged before-
hand. Highvoltage may be induced at themeasuring points if anopen circuit occurs.
Note: Agood diode should have aforward voltage drop of from 0.5 to 0.8 V.
However,thereverse voltage drop reading can vary considerably depending on
theresistance to other paths of conductance between thetips of thetestleads.
Continuity measurement
1. Connect theblack test lead to and
thered test lead to
.
2. Setthemultifunction selector to
.
3. Connect theends of thetest leads to
theends of thecables to be tested.
- No break in thecable: Thebuzzer
sounds continuously if theresistance is
<10Ω.
- Break in thecable: Thebuzzer does not
sound if theresistance is >70Ω.
Warning!
Make sure that thecircuit to be tested is not
conducting any current before testing for
continuity.