Testing Diodes - Wetekom 81 83 50 Instruction Manual

Notes:
 For resistance above 1 MΩ, the meter may take a few seconds
to stabilize readings. This is normal for high resistance meas-
uring.
 To obtain precision readings in Iow-resistance, that is the
range of 200 Ω, short-circuit the input terminals beforehand
and record the reading obtained (called this reading as X). (X)
is the additional resistance from the test lead. Then use the
equation: measured resistance value (Y) - (X) = precision
readings of resistance.
 To maintain the precision of the meter, never connect the
measuring probes with a power source. This can have a
negative effect on the characteristic specifications of the
meter.
 When there is no input, for example in open circuit condition or
when the measuring inputs are touched by hand, the meter
may show undefined display or the overflow display "i".

9. Testing Diodes

Use the diode test to check diodes, transistors, and other
semiconductor devices. The diode test sends a current through
the semiconductor junction, and then measures the voltage drop
across the junction.
1. Connect the black test lead to the COM jack (5) and the red
test lead to the VΩmA
2. Set the rotary function/range switch (2) to the
3. Connect the red test lead to the anode of the diode to be
tested. Connect the black test lead to the cathode of the diode.
4. The display will show the approximate forward voltage drop of
the diode. If the connection is reversed, "i" will be shown on the
display. Reverse the test leads in this case.
Using
jack (4).
33
position.