HP 8340b User Manual

The
rear
panel interface
signals
(e.g.
HP-IB,
SWEEP
OUTPUT,
Z-AXIS)
are
also routed
through
or
generated
in
the
controller functional
group.
The
sweep
control signal
from
the
controller
stops
and
starts the
sweep generator.
As
mentioned,
during
bandcrossings,
the
sweep
must
be
stopped
to
phase
lock the
YO
before
the
sweep
can continue.
The
controller monitors
sweep
events
such
as
bandcrossings,
end
of
sweep,
and
markers,
and
executes
specific instructions
according to
each
sweep
event.
FRONT PANEL
-
REAR PANEL
Front Panel
The
front
panel contains
the
user-interface
displays
and
keyboard
as
well
as
various input
and
output
connectors.
The displays
have
a
dedicated
microprocessor
that
keeps
them
updated.
When
the
instrument
processor
places
display
data
into
the
display interface
latch,
it
signals
the
display
pro¬
cessor
that
information
is
ready.
The display
processor
immediately
takes
the
data from
the
latch
and
stores
it
in
internal
memory.
The
data
is
handled
when
the
display
processor
has
time.
The
keyboard
communicates
directly
with the
instrument
processor.
When
a
key
is
pressed,
the
instrument
processor
either
executes
that
key
(if
it is
a single
key
operation),
or
waits for completion
of
the
key
sequence.
Different
key
sequences
not
only
allow
you
to
set
the
instrument
for
normal
opera¬
tion,
but
also allow
access
to
internal
registers,
latches,
D
to
A
converters,
and
calibration
constants
for
troubleshooting.
Rear
Panel
A
rear
panel
schematic
shows
all
interconnections
between
the
rear
panel
connectors
and
related
internal
assemblies.
RF
SECTION
The
RF
Section
contains
the
microcircuits
and
control
circuits that
produce
the
10
MHz to
20.0
GHz
(HP
8341
B)
or
26.5
GHz
(HP 8340B) RF
output from
the
2.3
to
7.0
GHz
YO
loop
output.
The
RF
output
from
the
A45
directional
coupler
in
the
YO
loop
is fed
to
the
modulator/splitter (mod/
splitter)
in
the
RF
section.
Band
0
(10
MHz
to
2.3
Ghz)
is
the
heterodyne
band
and
is
produced
by
mixing
a
swept
LO
drive from
the
mod/splitter with
the
phase-locked
3.7
GHz
oscillator
output.
The
IP
signal
from
the
low
band
mixer is routed
through
the
low
band
power
amplifier,
the
switched-YIG-
tuned multiplier
(SYTM),
the
high
band
coupler,
and
the
90
dB
step
attenuator
before
it
reaches
the
RF
output
connector.
The
SYTM
and
high
band
coupler perform
no
function
in
this
band.
Band
1
(2.3
to
7.0
GHz)
is
the
same as
the YO
fundamental
frequency.
The
RF
from
the
high
band
output
on
the
mod/splitter
is
amplified
by
the
high
band
power
amplifier
and
passes
through
the
SYTM
to
the
high
band
coupler.
Part
of the
RF
is
coupled
to
the
high
band
detector for
leveling
through
the
ALC
Loop.
After the
coupler,
the
RF
passes
through
the
90 dB
step
attenuator,
to
the
RF
OUTPUT.
A-6
Assembly-Level
Service Overall
Instrument
Theory
Change
7
HP
8340B/41B

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English