HP 8753D Option 011 User Manual

sampler is
also related
since it
is part
of the
source
phase
lo
c
k
lo
op.
The
source
supplies
a
phase-lo
c
k
ed
RF
signal
to
the
device
under
test.
Signal
Separation. The
signal separation
group divides
the source
signal in
to a
reference
path and
a test
path,
and
pro
vides
connections
to
the
device
under
test.
T
o accomplish
this,
one
of
sev
eral
external
test sets
must
be
connected to
the analyzer.
Receiv
er. The
receiver
group consists
of the
A4/A5/A6
sampler/mixers
and
the
A10
digital
IF.
The
A12
reference
assem
bly
and
the
A9
CPU
are
also
related.
The
receiv
er
measures
and
pro
cesses
input
signals
for
displa
y
.
The
follo
wing
pages
describ
e
the
operation
of eac
hof
the functional
groups.
P
o
w
er
Supply
Theory
The
p
o
w
er
supply
functional
group consists
of the
A15
preregulator
and
the
A8
p
ost
regulator.
These
t
wo
assem
blies
comprise
a
switc
hing
p
o
w
er
supply
that
pro
vides
regulated
DC
v
oltages
to
p
o
w
er
all
assem
blies
in
the
analyzer.
The
A15
preregulator
is
enclosed
in
a
casting at
the rear
of
the
instrumen
t
b
ehind
the
displa
y
.
It
is
connected
to
the
A8
p
ost
regulator
b
y
a
wire
bus
A15W1. Figure
12-2 is
a simplied
blo c
k
diagram
of
the
p
o
w
er
supply
group.
Figure
PSBLK12
here.
Figure 12-2. P
o
wer Supply Functional Group, Simplified Block Diagram
A15 Preregulator
The
A15 preregulator steps do
wn and recties the line v
oltage. It pro
vides a fully regulated
+5 V digital supply, and several preregulated voltages that go to the A8 post regulator
assembly for additional regulation.
The A15 preregulator assembly includes the line power mo dule, a 60 kHz switching
preregulator, and overvoltage protection for the +5 V digital supply.Itprovides LEDs, visible
from the rear of the instrument, to indicate either normal or shutdown status.
12-4 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