HP 8340b User Manual

HP
8340B/41B
Assembly-Level
Service
Overall
Instrument
Theory
The
HP
8340B
is
a
synthesized
sweeper
that
covers
the
frequency
range
from
10
MHz
to
26.5
GHz,
in
five
bands.
The
HP
8341B
is
a
synthesized
sweeper
that
covers
the
frequency
range
from
10
MHz
to
20.0 GHz,
in
four
bands.
The
instrument bands
are:
•
Band
0
10
MHz
to
2.3
GHz
•
Band
1
2.3
to
7.0
GHz
•
Band
2
7.0
to
13.5
GHz
•
Band
3
13.5
to
20.0
GHz
•
Band
4
20.0
to
26.5
GHz
(HP 8340B
only)
Internal
to
the
instrument
are
7
phase-lock
loops,
17
high
frequency
microcircuits,
and
a
16-bit
micro¬
processor.
REFERENCE
LOOPS
Frequency
accuracy
and
stability
are
tied
to
either the
10
MHz
internal
frequency
standard
or
an
external
5
orlO
MHz
source.
The
reference
loop
uses
this
10
MHz
to
generate
all
of
the
translation and
reference
signals
used
by
other
phase-lock
loops
in
the
instrument.
These
signals
are:
•
400
MHz
and
20
MHz signals used
in
the M/N
loop
to
produce
the M/N
output
frequency.
•
10
MHz
and
100
MHz
signals used
as
reference
signals
in
the 20-30
loops.
•
A
separate,
lower
power
100
MHz output
sent
to
the
RF
section
to phase
lock
the
3.7
GHz
oscillator
to the
10
MHz
reference.
M/N
LOOP
The M/N
loop
produces an
output between
177
and
197
MHz
that
drives
a
sampler
in
the
YO
loop.
The
variables
M
and
N
are
integers
generated
by
the
processor,
and control
the
output frequency
of
the
M/N
loop.
The
output
from
the
sampler
in
the
YO
loop
must always
be
between
20
and
30
MHz to
be
compared
and
phase
locked to
the
output
of
the 20-30
phase
lock
loops.
With
the
YO
at
a
specific
frequency
between
2.3
and
7.0
GHz,
there
is
an
M/N
output
frequency
between
177
and
197
MHz.
When
a
harmonic
of
this
frequency
is
mixed
with the
YO
frequency
in
the
sampler,
an
IF
output between
20
and
30
MHz
results.
The
sampler output
is
then
compared
to
the
20-30
loop
output
by
the
YO
loop
phase/frequency
detector
in
the
YO
loop.
A-4
Assembly-Level
Service Overall
Instrument
Theory
HP 8340B/41B

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English