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Simpson 260 Series - Page 53

Simpson 260 Series
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Operation
Rotate
the
function
switch
between
the
two
DC
positions
to
re-
verse
polarity.
This
will
determine
if
there
is
a
difference
between
the
resistance
in
the
two
directions.
To
check
a
semiconductor
in
or
out
of
a
circuit
(forward
and
reverse
bias
resistance
measure-
ments)
consider
the
following
before
making
the
measurement:
a.
The
polarity
of
the
internal
ohmmeter
battery
voltage
at
the
(+)
pos
jack
is
identical
to
the
function
switch,
polarity
setting,
and
opposite
to
the
(—)
common
jack.
b.
Ensure
that
the
range
selected
will
not
damage
the
semiconduc-
tor.
(Refer
to
Table
1-1
item
8,
and
review
the
specification
limits
of
the
semiconductor
according
to
the
manufacturer's
ratings.)
c.
If
the
semiconductor
is
a
silicon
diode
or
conventional
silicon
transistor,
no
precautions
are
normally
required.
d. If
the
semiconductor
material
is
germanium,
check
the
ratings
of
the
device
and
refer
to
Table
1-1,
item
8.
NOTE:
The
resistance
of
diodes
will
measure
differently
from
one
resistance
range
to
another
on
the
same
VOM
with
the
function
switch
in
a
given
position.
For
example,
a
diode
which
measures
80
ohms
on
the
R
X
1
range
may
measure
300
ohms
on
the
R
X
100
range.
The
difference
in
values
is
a
result
of
the
diode
characteristics
and
is
not
indicative
of
any
fault
in
the
VOM.
4-25

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