HP 8753D Option 011 User Manual

data in
the main
RAM. It
controls
the digital
signal
pro
cessor,
the
fron
t
panel
pro
cessor,
the
displa
y
pro
cessor,
and
the
in
terconnect
p
ort
in
terfaces.
In addition,
when the
analyzer is
in
the
system
con
troller mo
de, the
main CPU
controls
peripheral
devices through
the p
eripheral
port
interfaces.
The
main CPU
has
a
dedicated
EPR
OM
that
con
tains
the
op
erating
system for
instrument
con
trol.
F
ron
t
panel
settings
are
stored
in CMOS
RAM, with
a battery
providing
at
least
5
years
of bac
kup storage
when external
p
o
w
er
is
o.
Main
RAM
The
main
RAM
(random
access
memory)
is shared
memory for
the CPU
and the
digital
signal
pro
cessor. It
stores the
ra
w
data
receiv
ed
from
the
digital
signal
pro
cessor,
while
additional
calculations
are
p
erformed
on
it
b
y
the
CPU.
The
CPU
reads
the
resulting
formatted data
from
the
main
RAM
and
con
verts
it to
GSP commands.
It
writes
these
commands
to
the
GSP
for output
to
the
analyzer
displa
y
.
EEPROM
EEPR
OM (electrically-erasable
programmable read
only
memory)
con
tains
factory
set
correction
constan
ts
unique
to
eac
h instrumen
t. These
constants
correct
for
hardw
are
v
ariations
to
main
tain
the
highest
measuremen
t
accuracy
.
The
correction
constants
can b
e
up
dated
b
y
executing
the
routines
in
Chapter
3,
\Adjustmen
ts
and
Correction
Constan
ts."
Digital
Signal
Processor
The
digital
signal
pro
cessor
receiv
es
the
digitized
data
from
the A10
digital
IF.
It
computes
discrete
F
ourier
transforms
to
extract
the
complex
phase
and
magnitude
data
from
the
4
kHz
IF
signal.
The resulting
ra
w
data
is
written
in
to
the
main
RAM.
A18
Displa
y
The
A18
displa
y
is
a 7.5
inch
raster scan
CRT
with
asso
ciated
driv
e
circuitry
.
It
receiv
es
a
+65
V
p
o
w
er
supply
from
the
A19
GSP
,
along with
digital TTL
horizontal
and v
ertical
sync
signals, and
red,
green,
and
blue
(R
GB)
video
signals.
Automatic
degaussing
is
p
erformed
whenev
er
the
instrument
is switc
hed on
to minimize
the
magnetization
of
the
CR
T.
A19
GSP
The A19 graphics system pro cessor pro
vides an in
terface b et
ween the A9 CPU and the A18
display. The CPU (A9) con
verts the formatted data to GSP commands and writes it to the
GSP. The GSP pro cesses the data to obtain the necessary video signals and
sends the signals
to the A18 displa
y
. It also pro duces R
GB output signals whic
h are sen
t to the A16 rear panel.
The assem
bly receiv
es t
wopo
wer supply v
oltages: +5V
CPU, whic
his
used for pro cessing, and
+65 V, whic
h is passed on to A18
but not used on A19.
12-8 Theory of Operation DRAFT
3/21/106 15:14
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HP 8753D Option 011 Specifications

General

Brand	HP
Model	8753D Option 011
Category	Measuring Instruments
Language	English