Testing Diodes - Conrad 4092 Bedienungsanleitung

value displayed (before measurement) must be deducted
during the measurement operation.
c) In the case of a broken coil, instead of a measurement value
the display will read "OL" to indicate overload.
d) With this meter it is not possible to establish/measure the
quality "Q" of a coil/inductance.
e) It is possible for misleading values to be displayed when mea-
suring the inductivity of resistors.
After use, switch off the meter to avoid draining the battery un-
necessarily.
Warning!
Never connect up any voltage. This can destroy the meter. Do
not use to measure coils (transformers, chokes, reactors etc.)
when under voltage. Danger - possibility of mains or high-
voltage shock! Risk of fatal injury!
5.3 Measuring resistors (R)
Caution!
Check carefully to ensure that all of the circuit parts, circuits and
components to be measured and any other items for measuring
are completely voltage-free.
Connect the measuring leads supplied to the meter: the red lead
to the "+" socket (red) and the black lead to the "-" socket
(yellow). Set the measuring function switch to the desired range
for measuring. In the case of open test leads or high Ohm-
rated/broken resistors, "OL" for overload appears in the display.
Now connect the test-lead tips to the item for measuring. To
provide as high a degree of resolution as possible, thus keeping
measurement errors to a minimum, the measuring range should
be adjusted to the anticipated level of resistance. If, for example,
the colour coding on a resistor indicates a value of 120 Ohms, the
"200-Ω" range should be selected.
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NB
When carrying out a resistance measurement, care should be
taken to ensure that the measurement points at which the test-
lead tips come into contact to take the measurement are free of
dirt, oil, solderable lacquer or the like. In such circumstances the
values read may be misleading.
With resistors greater than approx. 2 MOhm, the display may
require some time to stabilise. As soon as "OL" appears in the
display, the measuring range has been exceeded or the measured
section is broken.
Warning!
Never connect up any voltage. This can destroy the meter. Do
not use to measure resistors (on components or lines) when
under voltage. Danger - possibility of mains or high-voltage
shock! Risk of fatal injury!

5.4 Testing diodes

Switch the meter on. Set the knob switch to "
measuring leads supplied to the meter: the red lead to the "+"
socket (red) and the black lead to the "-" socket (yellow).
Now connect the test clips to the item for testing, a voltage-free
semi-conductor section: the red test clip to the anode and the
black test clip to the cathode (this is generally identified by a
coloured ring, dot or the like).
If you are testing a diode section in the conducting direction, you
will be measuring a voltage from approx. 0.25 V (germanium) or
0.7 V (silicon) to 2 V, unless the diode section is faulty.
If you now switch the test clips round, ie. red to the cathode and
black to the anode, you will be checking what is referred to as
the blocking direction for the diode section. If the display shown
is "OL", the diode is in order. If, however, a value between 0 V
and 8 V is displayed, either the item for measuring has been
connected up incorrectly or it is faulty.
". Connect the
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