Heathkit IM-16 - Reading the Meter; Resistance (Ohms) Readings

PROBE ASSEMBLY
Refer to
Pictorial
13
(fold-out
fromPagel6)for
the following steps.
(
)
Locate the
probe
insert
insulator. Ifneces-
sary, remove any
"flash"
or sharp edge
from
the
insert insulator
with a file
or
penlanife.
(
)
Locate the two small
rivetsandtheremain-
ing 1
megohm
(brown-black'green)
resistor
shown
in
Detail 13A.
Insert the rivets
into
the
holes in
the
insulator
so
that
the head
of
each
rivet rests
on
the smallshoulder
aroundthe
hole in
the
insulator.
Now turntheinsulator
over
and lay
it
flat on
the workbench.
l*
r]l,
CUT
THE
CABLE
ACCORDING
TO THE
DIMENSIONS BELOIV'
PREPARE EACH
ENO
AS sHOWN.
OIMEN5IONs
TO OUTER
INSULATION.
TAKING CARE NOT
TO CUT THE
OUTER
SHIELD
OF
VERY
.!,
THIN
WIRES,
REMoVE
THE oUTER
lNsuLATloN
TWIST
THE
SHIELD
WIRES
INTO ONE
STRANO,
REMOVE
THE INNER
INSULA
TION.
THEN
TIN THE
END OF
THE
INNER CONDUCTOR.
DO
NOT TIN
THE SHIELD.
ttr(
v'
,fr(
l_^
itr\\
Jl n
n
,h[]\
u\L-
HII
@.'eP ffi
W
I sxoir-oen
CRIMP
KEEP
SoLDER
I
AIVAY FROM EOGE
REMOVE
FLASH
Detqil 13A
(
)
Cut
one resistor
lead
to 3/8".
Bend the
other
lead
over
and
cut
it flush with
the
first lead
as
shown
in
Detail
l3A.
Squeeze
the leads together so
that
they
line up
with
the
rivet
holes.
NOTE: Before
proceeding
further,
checkthepo-
sition of
the resistor
on
the insuletor.
With the
notch
in
the insulator
facing
you,
the
resistor
should
be
on
the
left-hand
side
as shown
in
Detail
13A.
(
)
Insert
the resistor
leads
into
the
rivets
and
lightly
crimp
the rivets
with long-nose
pliers
or
diagonal cutters
to hold
the
re-
sistor.
(
)
Solder the resistor
leads
to the
rivets.
Make
sure
the resistor
is square
with
the insert
insulator
and that
the solder flows
downthe
rivet
to
hold
the
rivet
tight
against
the
shoulder.
NOTE: Keep solder
awayfromthe
edge
of
the insert
insulator
toprovide clear-
ance for
the
internal
shoulder of
the
probe
center section.
Detoil 138
Refer
to
Detail
138
and
prepare
the shielded
cable
as shown.
NOTE: In the following
steps,
take special
care
to avoid
melting or
cutting
the
inner
plastic
in-
sulation
of
the shielded
cable.
When soldering,
hold
the wire
with long-nose
pliers near
the in-
sulation
to conduct
the heat
away
from
the
plastic
insulation.
(
)
Wrap
the end
without
the shield
around
the
curved
lead of
the resistor
and
solder
as
shown in
Detail
13C.
Use only
enough
heat
to
cause
a
good
solder
connection,
being
careful
not
to melt
the inner
insulation
of
the
shielded
cable.
SHIELD
WIRES
Detqil 13C