
Front
P
anel
F
eatures
Basic
Measurement
Functions
F
our
of
the
main
control
blocks
on
the
front
panel
are
STIMULUS,
P
ARAMETER,
FORMA
T
,
and
RESPONSE.
These
are
described
below:
STIMULUS
This
block
lets
you
select
RF
power
levels
,
and
desired
frequency
and
angle
settings
.
It
also
controls
how
you
can
trigger
the
instrument
to
take
each
point
of
data.
F
or
example
,
you
can
trigger
o
the
Record
Increment
pulses
(coming
into
the
receiver's
EVENT
TRIGGER
jack
from
the
positioner
controller)
by
selecting
EXTERNAL
trigger
.
Alternatively
,
you
can
trigger
over
HP-IB
using
the
GET
command.
P
ARAMETER
The
P
ARAMETER
block
contains
the
predened
input
ratio
keys
4
P
ARAM
1
5
(b1/a1),
4
P
ARAM
2
5
(b1/a2),
4
P
ARAM
3
5
(b2/a1),
and
4
P
ARAM
4
5
(b2/a2).
The
normal
measurement
mode
for
the
receiver
is
to
mathematically
ratio
(divide)
the
data
from
the
test
and
reference
antennas
.
Ratioed
measurements
reduce
most
errors
caused
by
the
range
,
and
shows
the
actual
performance
of
the
Antenna
Under
T
est.
Y
ou
can
redene
any
of
the
parameter
keys
to
ratio
any
two
inputs
you
desire
.
Y
ou
can
also
look
at
any
single
input
using
the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
1
a1
through
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
4
b1
softkeys
.
FORMA
T
F
ormat
keys
let
you
choose
how
the
data
is
displayed
on
the
screen.
Y
ou
can
select
logarithmic
magnitude
4
LOG
MAG
5 ,
linear
magnitude
4
LIN
MAG
5 ,
phase
4
PHASE
5 ,
polar
logarithmic
magnitude
4
POLAR
MAG
5 ,
and
polar
linear
magnitude
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
LINEAR
ON
POLAR
(located
under
the
FORMA
T
4
MENU
5
key)
RESPONSE
The
response
block
keys
let
you
set
the
display
scale
and
reference
line
.
Functions
under
the
MENU
key
let
you
turn
on
averaging
and
normalization.
(Normalization
allows
you
to
set
the
peak
of
the
main
lobe
to
0
dBi
and
measure
other
parts
of
the
trace
relative
to
the
peak.)
Each
major
control
block
has
functions
that
are
not
mentioned
here
.
Refer
to
Chapter
6,
7,
8,
and
9
for
descriptions
of
these
features
.
Front
and
Rear
Panel
3-7
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