Merc-O-Tronics 98 - TESTING DIODES; Diode Testing Procedure

OHMMTIER
RED
OHMMTftR
Figure
3l
TESTING
DIODES
1.
To
test
diodes
for shorts and opens,
each
diode
must be checked
twice.
These
two
checks are accomplished
by
reversing
the
polarity
such
as
the negative and
positive.
This
test
can be
made
on
your
Merc-O-Tronic
Analyzer.
(Black
Iead-,
smaII Red lead-)
By
placing
selector switch
on
position
No. 3 CoiI Continuity
(See
page
8,
paragraph
1, 2, and
3)
and by
reading
the
lower
red
figure
on
meter scale
No. 3.
Connect small
test
leads as
shown in Fig. 3l between
the
center
post
and
the
base.
A
zero reading in
both
tests
as outlined
above
indicates
the
diode
is
shorted.
A normal diode wiII show
a
high
reading
in
one
direction
and a
low
reading in
the
opposite
direction.
An
infinite
(Very
High)
reading in
both
tests indicates
the diode
being
tested is
open.
Before
replacing a
diode,
coat
the diode
threads with
silicone
grease
or
light engine
oil, and
then
tighten to 150-180 inch-pounds
of
torque.
2.
3.
4.
5.
6.
7.
8.
9.
5U