HP 8753D - Page 515

value),
and the
phase by
the angle
counterclockwise
from
the
positive
x-axis.
Magnitude
is
scaled
in
a
linear
fashion,
with
the
value
of the
outer
circle
usually
set
to
a
ratio
value
of
1.
Since
there
is no
frequency
axis
,
frequency
information
is
read
from
the
markers.
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POLAR
MKR MENU
leads to
a
menu
of
special
markers
for
use
with
a
polar
format.
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PORT
EXTENSIONS
goes
to the
reference plane
menu,
which
is
used
to
extend
the
apparent
location of
the measurement
reference
plane
or
input.
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PORT PWR
[COUPLED]
is
used
to
set
the
same
power
levels
at
each
port.
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PORT
PWR
[UNCOUPLED]
allows
you
to set
dierent power
levels at
each port.
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POWER
makes
power
level
the
active
function
and
sets
the
RF
output
power
level
of
the
analyzer's
internal
source
.
The
analyzer
will
detect
an
input
power
overload
at
any
of
the
three
receiver
inputs
,
and
automatically
reduce
the
output
power
of
the
source
to
0
85
dBm.
This
is
indicated with
the
message
\O
VERLO
AD
ON
INPUT
(R,
A,
B)."
In
addition,
the
annotation
\P
#
"
appears
at
the
left
side
of
the
display
.
When
this
occurs
,
set
the
power
to
a
lower
level,
and toggle
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SOURCE
PWR
on
OFF
.
If
power
meter
cal
is
on,
cal
power
is
the
active
entry
.
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POWER:
FIXED
sets
the
external
LO
xed
power
.
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POWER:
SWEEP
sets
the external
LO
power
sweep
.
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POWER
LOSS
brings
up
the
segment
modify
menu
and
segment
edit
(power
loss)
menu
explained
in
the
following
pages
.
This
softkey
is
intended
for
use
when
the
power
output
is
being
sampled
by
a
directional
coupler
or
power
splitter
.
In
the
case
of
the
directional
coupler
,
enter
the
power
loss
caused
by
the
coupled
arm.
Refer
to
P
ower
Loss
F
eature
on
a
previous
page
.
This
feature
may
be
used
to compensate
for attenuation
non-linearities
in
either
a
directional
coupler
or
a power
splitter.
Up
to
12
segments
may
be
entered,
each with
a dierent
frequency
and
power
loss
value
.
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POWER
MTR
toggles
between
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436A
or
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438A/437
.
These
power meters
are
HP-IB
compatible
with
the
analyzer
.
The model
number
in
the
softkey label must match the power meter to
be used.
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POWER SWEEP
turns on a power sweep mode that is used
to characterize
power-sensitive circuits
. In this mode
, power is swept
at a
single frequency
, from a start power value to a
stop power
value, selected using the
4
START
5 and 4
STOP
5 keys and the entry
block. This feature is convenient for such measurements as
gain compression or A
GC (automatic gain control) slope
.T
o
set the frequency of the power sweep, use
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CW FREQ in the
stimulus menu. Refer to the User's Guide for an example of a
gain compression measurement.
Note that power range switching is not allowed in power sweep
mode.
Key Denitions 9-29