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8502A
1
.
The exponent
is
replaced
with
an extra
digit
of
res-
olution.
2.
Error codes
are disabled.
Only
spurious
readings
will
now
denote
selection
of an
invalid
function.
3.
The
overrange
indication
is
disabled.
NOTE
When
changing
from one
function
.to
another,
or
upon
entering the
Cal
mode,
memory
modes
will
be
deactivated.
Stored
values
will
be
retained.
Use
of
RESET
or
interruption
of
power
to the
8502A
will
erase
memory
entries.
2-63.
OFFSET
2-64.
The
Offset
mode
can be
used
to
automatically
sub-
tract a
number
from
the
measured
input
and
display the
result.
The
subtracted
offset
number
may
be:
1
.
Any
currently displayed value
2.
A
programmed
numeric
entry (ranging
from +10^
to
-10^).
2-65.
The
displayed reading
in
Offset
mode
will
exliibit
no
increase in
digit
resolution.
Only
one
offset factor
at
a
time can
be
stored.
A
function
change
will
deactivate Offset
mode;
the
stored
value
will
be
retained.
A
flashing
H
will
appear
in
the
exponent
display
should
more
than
40V
appear
between
the input terminals
when
in
Offset
mode.
2-66.
SCALING
2-67.
The
Scaling
mode may
be used
to
automatically
divide a
measured
input
by
a
programmed
number
or
by
an
applied value. This feature
essentially
provides the
ability to
program
an
external reference
without standard
external
reference limitations
in
range, in
fact,
scaling values
may
range
from +10^
to
+10'®
and from
-lO^to
—
10"®.
A
scaling factor
of
0
is
not
allowed. Scaled readings
will
con-
tain
3
significant
digits
if
the original
reading
had
3 or
less
significant
digits.
For
more
than 3
significant digits
in
the
original
reading, the scaled reading
will
display the
same
number
of
significant
digits.
Only one
scaling
factor
may
be
stored
at a
time.
A
function
change
will
deactivate the
Scaling
mode
but
retain the
stored
factor.
NOTE
If the
8502A
is
in
both
Scaling
and
Offset,
the scaling
factor
will
be
applied
first;
the
scaled displayed values
will
then
be
offset.
2-68.
ZEROING
2-69.
There
are
two methods
of
zeroing
the
8502A.
Either
method
may
be used
in the
100
mV
range or the
1
0
ohm
range
2-70.
VDC/Ohms
Zero
2-71.
Correction
for internal
dc
drift
can be
made by
applying
a
good
quality,
low
thermal
short
between HI and
LO
terminals (not
between
test leads). If
necessary, repeat
this
operation
once
the
instrument
has
warmed
up.
Only
dc
volts
zero
factors
may
be
recalled.
2-72.
Zeroing with
OFFSET
2-73.
After zeroing
for internal
drift,
separate dc
volts
and
2-wire
ohms
measurement
corrections
can be
made by
shorting the
test
leads
and
storing the
reading
as
an
offset
factor.
2-74.
Systems Use
of the
8502A
2-75.
The
availability
of
optional
interface
modules
makes
the
8502A
adaptable
to a
large
variety
of
digital sys-
tems.
Operating
and
programming
instructions related to
remote
operation
are
included with
the appropriate optional
module.
Overall
information
on remote
interfacing
can
be
found
in
Fluke Application
Bulletin
—25
"System Use of
the
Fluke
Model 8500A",
Specific
information about
the
IEEE
interface
(-05
Option)
may
be
found
in
Fluke
Appli-
cation
Bulletin
—36.
Application
Bulletin
—37
"Unique
Measurements
Using the
8500
Series Digital
Voltmeter"
will
also
be useful
for
both
local
and
systems
use
of
the
8502A.
2-76.
OPERATING
DIRECTIONS
2-77.
Initial
Settings
2-78.
Upon
applying
power
to the
8502A,
the display
will
read:
"HI-2.0.Y"
("Y"
will
be
the
number
of
the software version
employed
in
your
instrument.)
Then:
"CXXXXX"
("X"
will
be identifying
numbers
for installed
options.)
The
instrument
will
now
assume
the following
status:
1
.
V
DC
function
2.
lOOOV
range
3.
Slow
reading
rate
(7)
4.
Fast
filter
(FO)
2-8
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