66
ATTENTION
Do not apply voltage to the inputs when carrying out the conduc-
tion test on the diodes.
Failure to do so, could result in damage to both the unit and the
operator.
It is mandatory to make sure that the circuit under test is not live
and any existing capacitors in the circuit itself are discharged.
5.4. Diode test
1.
Set the rotary switch to position.
2. Insert the red test lead into the
+
input terminal
and the black test lead into the
COM
terminal.
3. Connect the red test lead to the anode of the
diode and the black test lead to the cathode.
67
For a good silicon diode, the voltage drop (dc
bias) is between 0,400V and 0,900V.
When the display reading goes to 0,850V, the
instrument emits a short acoustic signal to indicate
a correct direct voltage drop for the common
silicon diodes.
However, if the reading goes further below
0,100V, the instrument emits the continuous
acoustic signal together with the flashing of the
display backlight to indicate that the diode is in
short-circuit.
A higher reading indicates a leaking diode
(defective).
A zero reading indicates a diode in short-circuit
(defective).
The out-of-range reading OL indicates an open
diode (defective).
By reversing the connection to the diode (reverse
bias), the display shows OL when the diode is OK.
Any other different reading indicates that the diode
is resistive or in short-circuit (defective).
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