Table of Contents
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1-1.
INTRODUCTION
1-2.
This
manual
comprises
eight
modular
sections.
You
will
find herein
up-to-date
information
for installing,
oper-
ating
and
maintaining the Fluke
Model
8502A
Digital
Multimeter. Generally,
complete
descriptions
and
instruc-
tions are
provided
for
the
8502A
mainframe,
modules
necessary
for
DC
Volts
and
DC
Ratio
measurement, and
for
any
optional
modules
(AC
Converter,
Ohms
Converter,
etc.)
that
you
may
have ordered with your
8502A.
Specifically,
each
section contains:
1.
Section
1
—
General
description, specifications.
2.
S«:tion
2
—
Operating
instruction,
capabilities.
3.
Section 3
~
Theory
of
operation, including
simplif-
ied
schematic
and
functional
block
diagrams.
4.
Section
4
—
Maintenance, adjustments
and
trouble-
shooting.
5.
Section 5
-
List
of
replaceable
parts,
with
parts
locators.
6.
Section 6
-
Option and
accessory information,
including
complete information on any
option
ordered
with
the
8502A.
As
the
need
arises
to
broaden
your 8502
A*s
capabilities,
the
most
recent
information
will
be included with
any
options
you
order.
7.
Section 7
—
General information
(list
of
abbrev-
iations,
federal
supply
codes.
Service Centers,
and
Sales
Respresentatives).
8.
Section
8
—
Schematic
diagrams.
1-a
DESCRIPTION
1-4.
The Model
8502A
Digital
Multimeter
is
a
6
1/2
digit
instrument
employing
microprocessor
control
and
a
bus
structure.
Memory
programming
either
from
the front
panel
or
through a remote
interface
permits a
number
of
operations to be
performed
on
the
measured
input before
it
is
displayed.
The
standard configuration allows
for
mea
surement of dc
volts in
5
ranges.
Four
ranges are
available
for ac volts
when
either
optional ac converter
is
installed.
Resistance can be
measured
in
8
ranges.
Current can be
measured
in
5
ranges.
1-5.
Modular
Construction
1-6.
Considerable
versatility
is
realized
through
the
8502A's
unique
constructicm.
All active
components
are
contained
in
modules which
plug
into
a
mainframe
mother-
board. This
module-motherboard
mating,
combined
with
bus
architecture
and
microprocessor
control, yields
both
ease of
option
selection
and
reduced downtime.
1-7.
Microprocessor Control
1-8.
All
modules
function
under
direct
control of
a
microprocessor based
controller.
Each module
is
addressed
by
the controller
as a
memory
location.
External
reference
values
and
offsets
can
be applied
separately,
stored
in
mem-
ory,
and
automatically used
as
factors
in
all
subsequent
readings.
Digital filtering utilizes
averaged samples
for
each
reading.
1-9.
Recirculating
Remainder
A/D
Conversion
1-10.
The
8502A
adapts
Fluke's
patented
recirculating
remainder (R^)
A/D
conversion technique
to
micropro-
cessor control. This
combination
provides
fast,
accurate
linear
measurements and
long-term
stability.
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