Mode18754A Instrument Description
6 dB
Coupling
-6
dB
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J
Port
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2
DC
Bias
--
------------,
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t
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-6
dB I
Port
1
Reference
Plane
Extension
I
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A
I
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rt
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511/521
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8748A
L _
RF
Input
8748A
Reference Plane
Extension
Cables
8748A
S-Parameter
Test
Set
Measurement setup instructions for the 8748A will refer
to
the rear panel Reference
Plane
Extension cables. These are
the rigid loops provided with the 8748A
to
equalize the
lengths
of
the reference
and
test signal paths
to
achieve
correct phase calibration. Six
of
these loops are provided.
Connect one between the 8748A
rear
panel
REFERENCE
PLANE
EXTENSION
connectors depending
upon
the
method
used
to
connect the test device
to
the test ports. The
table below lists their
part
numbers
and
application in order
of
increasing lengtll.
HP Part
No.
Appl
ication
Storage-Normalizer. Two storage-normalizer units are offered
for use with the 8754A. Both use digital storage
to
provide
crisp, flicker-free CRT displays regardless
of
sweep rate, and
normalization
to
remove
the
frequency response character-
istics
of
a standard from the measurement.
08748-20020
08748-20021
08478-20022
08478-20023
08478-20024
08748-20025
Test device
connected
directly
to
Port
1
or
Port
2
(reflection
only).
60
to
120
mm
adapter
length
at
Port
1
or
Port
2
(reflection
only).
11608A
Transistor
Fixture
(transmission/reflection)
or,
120
to
190
mm
adapter
length
at
Port
1
or
Port
2
(reflection
only).
190
to
250
mm
adapter
length
at
Port
1
or
Port
2
(reflection
only).
116008
or
116028
Transistor
Fixture
with
11858A
Transistor
Fixture
Adapter
(transmission/reflection)
Test device
connected
between
two
11857
A
(610
mm,
24")
Test
Port
Extension
Cables
(transmission/reflection)
8750AStorage
Normalizer
The 8750
is
an economical way
to
provide digital storage and normalization for rectangular magnitude and
phase traces.
All
standard features
of
the
8750 apply
to
operation with
the
8754A. The rectangular measure-
ment
trace
is
digitized
at
250 points/sweep with 500-point y-axis resolution. The
8750A
does
not
process
the
polar trace.
The 850
I A processing includes averaging and
magnification. In addition,
the
8501 A will pro-
cess a polar trace. A single internal adjustment
(DAC gain)
is
required
to
match
the
8501A
to
the
8754A. All standard features
of
the
850lA
apply
to
operation with the
8754A
except dis-
play
of
operating mode labels. Data can be read
from the 8501 A memory via the HP-IB. Graphics
written
into
the
8501A
via the HP-IB can be
displayed by the 8754ACRT
but
reduced writing
speed
of
the 8754A CRT causes dropouts and
distortion
of
figures.
8501 A Storage Normalizer
5
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