1-1.
INTRODUCTION
1-2.
This eight-section manual provides comprehensive
information for installing, operating and maintaining
your Fluke digital multimeter. Complete descriptions
and
instructions are included for the instrument mainframe,
for all
modules necessary
in making dc
volts
measurements, and for any optional
modules ordered
with the instrument. Appropriate sectionalized
information
is
also included with
any optional
modules
subsequently ordered and may be inserted
in Section
6.
1-3. DESCRIPTION
1
-4.
The multimeter features
6-1/2
digit resolution,
full
annunciation and simplicity of operation.
Modular
construction,
microprocessor
control, and a bus
structure
provide excellent flexibility.
Memory
programming from
the
front panel (or through
a
remote interface)
controls all
measurement parameters, mathematic operations
and
special operations. An
averaging
mode is available
to
automatically optimize display resolution and stability
for each
function and range. The standard
hardware
configuration
allows for measurement
of dc volts in five
ranges
with 100 nV resolution on the lowest range.
Optional modules are
available
for ac volts (four ranges),
ac or dc
current (five ranges), and resistance (eight
ranges)
in
two-wire or four-wire arrangements.
1-5.
Modular Construction
1-6.
Considerable versatility is realized through
unique
contruction. All active components are
contained in
modules which plug into a mainframe motherboard.
This
module-motherboard mating,
combined with
bus
architecture and microprocessor control, yields
both ease
of option
selection
and reduced downtime.
NOTE
The A3 Isolator
PCS is standard in
the
8505A. This
assembly is documented
in
Section
6
of
this manual
as
Option
-08A.
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 virtual memory.
External
reference values and offsets can be applied
separately,
stored in
memory, and automatically
used as factors
in all
subsequent readings. Digital filtering
utilizes
averaged
samples for each reading.
1-9.
Software Calibration
1-10.
The 8505A features microprocessor-controlled
calibration
of
all ranges and
functions.
Any range
can
be
calibrated using
a reference
input of
any known
value
from
60%
of range to full scale. Software
calibration
can
be
performed
using front-panel or remote
control,
allowing recertification without opening
the case
or
removing the multimeter from the system.
1-11. R@elreufating Remainder A/D
Conversion
1-12.
The multimeter adapts Fluke’s
patented
recirculating remainder (R
2
)
A/D
conversion
technique
to
microprocessor control. This combination
provides
fast,
accurate, linear measurements
and long-term
stability.
1-13.
Options and
Accessories
1-14.
Remote interfaces,
ac converters,
a current
converter,
and an ohms converter
are
among the
numerous options and accessories
available for
use with
the multimeter. Refer to Tables
1-1
and
1-2
for complete
listings. AC
conversion
can be accomplished
with either
the AC Averaging module
(Option
01)
or
the RMS
module (Option 09A). Any one
of the three
Remote
Interface modules (Option
05, 06,
or
07)
can
be installed
at one time.
1-15. SPECIFICATIONS
1-16. Mainframe specifications with
dc volts and
dc
ratio
measurement capability are presented
in Table
1-3.
Optional function specifications are supplied
with the
respective option modules and included
in Section 6.
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