6
Diode Test, Capacitance (Model 878 only) functions
Press the
SELECT button momentarily to toggle the functions. Last selection will be
saved as power up default for repeat measurement convenience. (Model 877
Diode
Test function is combined to its
/ /
Rotary Knob position)
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).
