General Tools and Instruments DAMP68 v.1 - Manuel (Page 15)

(2) Plug the black and red test leads into the
– and + input terminals, respectively.
(3) Measure the resistance by touching the
probes to the desired test points of the circuit.
(4) Read the measured resistance on the display.
If the resistance value is over range, OL will
appear on the display.
CHECKING THE INTEGRITY
OF A DIODE
(1) Turn the function switch to the (DAMP60)
or (DAMP68) position. Press the SHIFT
button to select the diode check function.
(2) Plug the black and red test leads into the
– and + input terminals, respectively.
(3) Connect the red test lead to the anode
(positive terminal) of the diode to be tested,
and the black test lead to its cathode
(negative terminal).
(4) Read the forward bias voltage value on the
display.
(5) If the polarity of the test leads is reversed, OL
will appear on the display. This can be used to
distinguish the anode and cathode of a diode.
(6) A silicon diode typically has a forward bias
voltage of 0.7V. A germanium diode typically
has a forward bias voltage of 0.3V. A 0V
reading in both directions indicates a shorted
15
RED TEST LEAD BLACK TEST LEAD
RED TEST LEAD BLACK TEST LEAD