MD 9040 & MD 9050 Digital multimeter
Operation
13
Capacitance,
Diode test functions
Press the
SELECT
button momentarily to select the
subject functions in sequence. Last
selection will be saved as power up default for repeat measurement convenience.
CAUTION
Discharge capacitors before making any measurement. Large value capacitors should
be discharged through an appropriate resistance load.
Normal forward voltage drop (forward biased) for a good silicon diode is between
0.400V to 0.900V. A reading higher than that indicates a leaky diode (defective). A zero
reading indicates a shorted diode (defective). An OL indicates an open diode
(defective). Reverse the test leads connections (reverse biased) across the diode. The
digital display shows OL if the diode is good. Any other readings indicate the diode is
resistive or shorted (defective).
A, mA, and A Current functions
Press
SELECT
button momentarily to select
DC
,
DC
+AC
,
DC+AC
+AC
and
AC
+Hz
.
Last
selection will be saved as power up default for repeat measurement convenience.