General
Information
Option
910 provides
one
additional
Operating
and
Service
Manual
(and
suppliment).
To
obtain
additiona
1
Operating
and
Service
Manuals
after initial
shipment,
order
by
manual
part
number.
listed
on
the title page
and
rear
cover
of
this
manual.
1-38.
ACCESSORIES SUPPLIED
1-39.
Figure
1-1
shows the 8756A
Scalar
Net-
work
Analyzer
HP-
IB
cable
and
power cable.
The
power cable
supplied
depends
upon
the
country
of
destination. Refer to Section II
of
this
manual
for
HP
Part
Number
information.
1-40.
EQUIPMENT
REQUIRED BUT
NOT
SUPPLIED
1-41.
A swept microwave source with
27.8
kHz
modulation
capability,
(internal
or
through
the
use
of
an
external
modulator)
and
from
one
to
three detectors
and/
or
directional bridges are
required
to
make
microwave
measurements
with
the
8756A
Refer to
EQUIPMENT
AVAILABLE
for specific examples.
EQUIPMENT
AVAILABLE
1-42.
11664AIB
Detectors
1-43.
Up
to three
Model
11664NB
Detectors
may
be
used with
the
8756A.
The
11664NB
detects
the
envelope
of
the 27.8
kHz
modulated
RF
signal.
Each
detector uses a
biased
Schottky
diode to achieve
-50
dBm
sensitivity.
The
fre-
quency
range
of
the 11664A
Detector
is
10
MHz
to
18
G Hz.
The
extended
frequency
range
of
the
11664B
Detector
is
10
MHz
to
26.5
GHz.
1-44.
85020AIB
or
85021
AlBIC
Direc-
tional Bridges
1-45.
The
85020A/B
and
85021A/B/C
are
Directional
Bridges designed for
the
8756A
and
8755C
Scalar
Network
Analyzers.
Within
each
bridge,
one
zero-bias Schottky
diode
detector
measures the return loss
of
the
test device.
Ratio
measurements
may
be
made
by
adding
a power
splitter
(HP
11667A)
and
detector
(HP
11664N
B).
The
85020A
has
a frequency
range
of
0.0 I to
4.3
GHz.
with a
nominal
impedance
of
50
ohms.
The
85020B
has
a frequency range
of
0.01
to 2.4
GHz
with a
nominal
impedance
of
75
ohms.
The
85021NB
provides
an
extended
frequency
range, with
the
85021A (APC-7 test
port
connec-
1-4
Model8756A
tor)
and
the
85021
C
(Precision
Type
N test
port
connector)
covering
0.01
to
18
GHz.
and
the
85021 B (APC-3.5 test
port
connector) covering
0.01
to
26.5
GHz.
85021A/B/C
nominal
impedance
is 50 ohms.
1-46.
11665B
Modulator
1-47.
The
11665B
Modulator
is
required
if
the
RF
signal
source
used
does
not
have
the
capability
of
modulating
the
RF
output
at
a 27.8
kHz
rate.
The
11665B
Modulator
modulates
test
signals from
15
MHz
to
18
GHz
with
the
27.8
kHz
from
the
8756A. Refer to the Section III
Operation
portion
of
this
manual
for
further
information
on
test setup
and
measurements
regarding
the
use
of
the
11665B
Modulator.
1-48.
11
666A
Reflectometer Bridge
1-49.
Reflection
measurements
from 40
MHz
to
18
GHz
may
be
made
with
one
coupling
device
using
the
11666A Reflectometer Bridge.
With
the
addition
of
an
external
11664NB
Detector, two
simultaneous
ratio
measurements
of
insertion
and
return
loss
may
be
made. Refer
to
the
Section III
Operation
portion
of
this
manual
for
further
information
on
test setup
and
measurements
regarding
the
use
of
the
11666A Reflectometer Bridge.
1-50.
11667
A Power Splitter
1-51.
The
11667A
Power
Splitter
is recom-
mended
when
making
low
loss
wideband
transmission
measurements
with
the
8756A
This
two-resistor type splitter provides excellent
output
SWR
at
the
auxiliary
arm
when
used
for
source leveling
or
ratio
measurement
applica-
tions.
The
0.25 dB
tracking
between
output
arms
over a frequency
range
of
de to
18
GHz
allows
wideband
measurements
to
be
made
with a
minimum
of
uncertainty.
1-52.
11678A
Low
Pass
Filter Kit
1-53.
The
11678A Low Pass
Filter
Kit
contains
five low pass filters with
the
following
cutoff
fre-
quencies: 11688A
2.8
GHz:
11689A 4.4
GHz:
11684A. 6.8
GHz:
11685A, 9.56
GHz:and
11686A
13.0
GHz.
The
use
of
low
pass
filters
is
recommended
to reduce
undesirable
harmonics
generated
by
the
RF
source
when
making
pre-
cise
broadband
measurements.
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