Note:
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 baised)
across the diode. The digital display shows OL if
the diode is good. Any other readings indicate
the diode is resistive or shorted (defective).
26
Insert the red test lead into the correct
m
A/mA or A
input jack. Press
SELECT
button momentarily to
select DC, AC, or DC+AC. The new settings will
be saved automatically to the non-volatile memory
as power up default. In DC mA function, neither in
AC nor in DC+AC,
press and hold the %
4-20mA
(
~Hz
) button for 1 second or more to display the
current digital data in terms of loop current
percentage (%) value. It is set at 4mA=0%(zero)
and 20mA= 100%(span) with 0.01% high
resolution, which virtually extends the meters'
capability to test and regulate the externally
powered loop current in the industrial process
control applications. The analog bar-graph
remains showing the mA current value to alert the
user.
m
A, mA, A, and %4-20mA Current functions
27
