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HP 83480A User Manual

HP 83480A
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How the Instrument Works
System Architecture
The major mainframe hardware components
This section describes the major hardware components within the mainframe.
Trigger generator
The trigger generator receives the trigger input and sends a signal to the
sequential delay generator whenever an edge meeting the trigger criteria is
received, when the trigger is enabled.
Sequential delay
generator
The sequential delay generator controls the time between when it receives a
trigger
input from
the
trigger
generator
and
when
it
sends
a
trigger
output
to
the
pulse
lter.
These delay
times increase
sequentially with
each
trigger
event,
allowing
the
trace
to
build up
from left
to
right
across
the
screen.
The
delay
values
depend
on
the record
length and
timebase
setting,
and
are
programmed
into
the
sequencer
memory
by the
system microprocessor
.
A/D
converter
The
A/D
converter
tracks
the
peak
value
of
the
analog
pulse
at
its
input
and
converts
it
to
a
12-bit
digital word.
These
12-bit
words
are
put
into
a
FIFO
memory
which
is
then
read
and processed
by
the
CPU
.
CAL
table
The
CAL
table
automatically
adds
the
calibration
factors
to
the
sampled data.
The
result
is
referred
to
as
adjusted
data,
and
it
is
sent
to
the
system
bus
.
The
CAL
table
increases
the
throughput
of
the
analyzer
because
the
CPU
now
reads
calibrated
data,
and
does
not
have
to
explicitly
correct
it.
This
is
faster
than
using
a
software solution.
Microprocessors and
coprocessors
There are two 32-bit microprocessors, one 32-bit coprocessor, and one 16-bit
coprocessor in the mainframe.
Motorola 68020 A 32-bit microprocessor that controls the system hardware,
and
also
acts as
a
trac
controller
on
the
system
bus
.
Motorola
68882
A
32-bit
coprocessor
that
performs
all
of
the
oating point
math.
TMS34010 A 32-bit microprocessor that draws data on the display
.
HP custom
graphics
coprocessor
A 16-bit coprocessor that controls the gray scale persistence
mode, and also writes blocks of data (like the markers and
display background) to the display.
13-10

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HP 83480A Specifications

General IconGeneral
BrandHP
Model83480A
CategoryMeasuring Instruments
LanguageEnglish

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