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 8502A*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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