Fluke 8860A Operator's Manual page 55

OPTION -007
S°°"
(S' Th^lollowfnrp'oce^e
Ebes
Slatfon
of the
EKtern
a
al
Reference
(Ext. Ref.)
without
the
Rear input
option.
n07 7
lf
the External
Reference option
is
being
installed
with the
Rear
Input option
the 20-pin
Rear
Input connector will
be used rather than the
dual
banana
jacks. In
this
case,
follow the
installation
procedure given
in
the
Rear Input
op
ion.
1
.
Disconnect
the
8860A frpm
its
line
power;
remove
all
signals
from
its
front
(and
rear)
panel
inputs.
2
Remove the
top cover
by unscrewing
the four
screws located
on
the
bottom
of
the
u"d
pulling the
cover
straight
up and
off.
3
Remove
the
guard
cover
by unscrewing
its
four top
screws.
(The guard
cover
is
the large,
gold-colored metal cover with
adjustment holes.)
4
.
Lift
out the
A/D-Ohms
circuit
board,
shown
in
Figure
007-2.
5
Thread the
two
wires
(Gray
and Violet)
from the External
Reference drcuit
board through
the hole at
the rear,
and from
the
component
side
of the
A/D
Ol
board,
as in
Figure
007-2.
fi
Plug
the External
Reference
board
into the
A/D-OHMS
board
(9-pin
connector).
Fasten
the
External Reference
board
in
place
with a screw
from
th
other side.
7
Reinstall the
A/D-Ohms
circuit
bo'ard into
its
slot in
the
mam
instrument,
ever
removed.
0
From
the
inside
install
the dual
banana
jack connector
in
the
rear
panel hole
Fasten
it
with
two screws.
You
will
need
ashort,
stubby screwdriver
or a
nght-ang
screwdriver to
fasten
the
lower
screw.
-
-
-
007-2