Fluke 8600A - Page 79

8600A
6-92.
POLARITY
FLAG
6-93.
The
polarity
of
the
dc voltage
input
to
the A-D
Converter
determines
which
polarity
sign will
be presented
at DOU
output
pin
3;
pin
5
provides
POL
in Model
8800A
only.
A positive
dc level
at the
converter
will
cause DOU
output
pin 3
to
go to
logic 1
and
pin
5
(8800
A)
to go to
logic 0.
A negative
converter
input
will
cause
the opposite
logic
level
output
from
each
pin.
6-94.
OVERLOAD
INDICATION
6-95.
The
DOU
provides
a single-bit
output
indication
of
a display
overload
condition.
When
the
digit
count exceeds
the
display
capacity
pin
6 of the DOU
output
connector
changes
from
a
logic
0
to
logic
1.
6-96.
RANGE
CODE
6-97.
The
instrument
range
is
presented
in
a
three-bit
bed
format
at DOU
output
connector
pins H,
7,
and F.
The
output code
representing
each
range
is presented
in
Table
64.
b.
Strip
one-half
inch
of
insulation
from
the DOU
con-
nector
end
of the
wires
and tin
each wire.
c. Cut
3
1
pieces
of
sleeving
one-half
inch
long.
d.
Place
one
piece
of sleeving
over
each prepared
wire.
e.
Solder
a connector
contact
pin
to each wire.
f.
Slide
the
sleeving
over
each solder connection.
g.
Insert
one
connector
contact
pin into
each DOU
mating
connector
position
corresponding
to
the
desired
data output.
h. Prepare
the
mating
connector for
the
interface
instrument.
Ensure
that
the data
line connections,
at the
interface
instrument
mating
connector,
place
the DOU
data on
the correct
pins.
6-98.
DISPLAY
DIGIT
6-99.
The
numerical
value
of each
digit
of the
instrument
display
is presented
in a four-bit
bed
format
at the DOU
output
connector.
The
connector
pin assignments
for
each
significant digit
of
the display
are provided
in Table 6-4.
The
most
significant
digit
(DOU
connector
pins
18,
19,
V,
and
W)
needs
only one
active
bit to
represent
the
two
display
digits, 1 or
0. The
three remaining
bits
are
connected
to
ground
in the DOU
and,
in most
cases, the
corresponding
bits in the
remote
display
unit
must also
be
grounded
to
represent
a
logic
0.
6-100.
DOU
INTERFACE
CABLE
6-101
. A mating
DOU
connector
is
supplied
with the
DOU
option for
fabrication
of
a custom
interface
cable. Use
the
following
procedure when
constructing
the interface
cable.
a.
Assemble
the following
equipment:
1
. Teflon or
vinyl
insulated
wire,
26
gauge, 3
1
pieces
cut to the desired
length.
2.
Sleeving,
#
16 for
vinyl
wire,
or
#
18
for
teflon.
3. Rosin
core solder,
60/40.
4. Wire
strippers.
5.
Soldering
iron,
pencil-type
(45
W
max.)
6.
DOU
mating connector.
7.
Mating
connector for
interface
instrument.
1/77
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