Fluke 8600A - 6-80. DATA OUTPUT UNIT (OPTION -02)

8600A
power
rating
of
at least (4.8V)
(.175
A)
=
.85W.
(A
2-watt
carbon
composition
resistor
is suitable.)
6-75.
Allow
the
battery
pack
to
discharge
for
30
hours,
then
charge
the
battery
pack
at
twice
the
discharge
rate
for
20
hours.
(In
the example,
the
charging
rate
would
be
0.35
amperes
at 4.8
volts.)
When
charging
is
complete,
discharge
the pack
at
the
capacity-divided-by-20
rate
for
30
hours, then
recharge
at
twice
the
discharge
rate
for
a
period
of 20 hours.
The
battery
pack
should
now
be
restored
to its
rated
capacity.
6-76.
BATTERY
REPLACEMENT
6-77.
Use
the
following
procedure
for
removing
and
replacing
batteries:
CAUTION!
Do
not
attempt
to charge
alkaline,
zinc-carbon
or
mercury
batteries
in
the
8600
A.
a.
Disconnect
line cord.
Remove
retaining
screw at
rear of
instrument
case,
and remove
instrument
from
case.
b.
On the
underside
of the
pcb, remove
the two
threaded
bolts securing
the
battery
holders.
c.
Remove
the holder tops
and batteries.
d.
Replace
the
batteries with
1
.2
volt
nickel-cad-
mium
batteries (JF
Part No.
346924).
Install
the
batteries
in
the
direction
indicated
by the
polarity
markings
on the battery
holder.
6-78.
FUSE
REPLACEMENT
6-79.
The
input
power fuse
FI
is located
on the
interior
of
the
instrument
near
the power
transformer.
If replace-
ment
is necessary,
use an MDL
1/8A (slo-blo)
for battery
powered
instruments.
CAUTION!
Line
potential
exists
on the
fuseholder
whenever
the
instrument
is plugged
into
the line.
6-80.
DATA
OUTPUT
UNIT
(OPTION -02)
6-81.
Introduction
6-82.
The
Data
Output
Unit
(DOU)
provides
digital
measurement
information
to a rear
panel
output
connector
for
use
by remote
display
instruments
or data
printers.
The
output
data
is in
parallel
bed
format
and
is
compatible with
the Fluke
Model
2010A Digital
Printer.
6-83.
Specifications
6-84.
The
specifications
for
the DOU
are
presented
in
Section
1
of this
manual.
6-85.
Operation
6-86.
DOU
DATA
IDENTIFICATION
6-87.
The
data
available
at
the rear
panel DOU
connector
is listed
in
Table
64.
The
connector
pin
assignment
and
logic
level
requirement
for
each
signal is
provided.
6-88.
DATA
UPDATE
6-89.
Refer
to
figure
8-6
and the timing
diagram (figure
6-14)
for the
following
discussion.
The DOU
output
can
be updated
by an
external
command
(ARM ENABLE,
ARM
INPUT) or
allowed
to
update
automatically
(FREE
RUN)
at the end
of
each
new
instrument
measurement.
A logic level
1
(+4.75
to
+5
.25V)
applied to
ARM ENABLE
(pin B)
and a logic
level
0
applied to FREE
RUN will
prevent
acquisition
of
new data
by the DOU.
A positive
going
trigger
applied
to
ARM INPUT
(pin
C) will enable
the
DOU to
acquire
data.
New data
will
start to load
into
the DOU
after the
next
measurement
is
complete.
BZ (from
the
instrument
to the
DOU)
occurs synchro-
nously
with the
second
STO
signal affer a
measurement
is complete
and lasts for
one
strobe
cycle. BZ is presented
to
U10 as a
data input.
ST5
clocks the data
into U10.
As
soon as data
appears
in U10,
RG
is
applied
through U1
1
and
the
isolation
circuit to U4,
U3, U2, and Ul. At this
time
the
busy
flags
are applied
to the
DOU output
signify-
ing that data
is
being
changed.
U10
enables
the
data
on
W to
be
serially
loaded
into
the
bottom of
U4
during
the
first strobe
cycle.
When
STS occurs
again, the data
in U10
is shifted to enable
the
data
on
X
to be loaded into U4.
Four
strobe cycles are
required to
load the new data.
When
the fifth
ST5 signal
occurs, U10 is emptied of data
and
all its outputs are
0.
RG
is
then inhigited
by
Ul 1
and
the
clocking of
data
ceases. The busy flags
are
cleared
from
the DOU
output and
the
data can
be
read. ARM
INPUT may
go
to
0 at any
time in the cycle but
it must
go to 0 before
a data update
can be externally
commanded.
If
desired the DOU
will
automatically update
at the end of
each instrument
measurement. If FREE
RUN is allowed
to
be high, the
DOU will automatically
update the data
after
each measurement.
6-90.
BUSY
FLAG
6-9
1 . The
updating
period
of
the
DOU
is signified
by
the
BUSY
(pin
2)
and
BUSY
(pin
4)
outputs from
the DOU.
During
this
period
the data
on the output
connector pins
will
be changing
to reflect
the
updated input. Either the
positive true BUSY
or
negative true
BUSY flag
can
be used
to
inhibit the
data recording
instrument
during this time
period.
1/77
6-11