The P
ower Menu
The
power
menu
is
used to
dene and
control analyzer
power.
It consists
of the
following
softkeys:
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PWR
RANGE
AUTO
man
allows
you
to
select
power
ranges automatically
or manually
.
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POWER
RANGES
provides
access to
the power
range menu.
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N
SLOPE
compensates for
power
loss
versus
the
frequency
sweep
,
by
sloping
the
output
power
upwards
proportionally
to
frequency
.
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N
SLOPE
on
OFF
toggles
the
power
slope
function
on or
o.
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SOURCE PWR
ON off
allows you
to switch
the
source
power
on
or
o.
When
a
power
trip
occurs
,the
trip is
reset
by
selecting
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N
SOURCE
PWR ON
.
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CHAN
PWR
[COUPLED]
allows
you
to
couple
or
uncouple
channel
power
.
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PORT
POWER
allows
you
to
couple
or
uncouple
port
power
.
Understanding
the
Power
Ranges
The
built-in
synthesized
source
contains a
programmable step
attenuator
that
allows
you
to
directly
and
accurately
set
power
levels
in
eight
dierent
power
ranges
.
Each
range
has
a
total
span
of
25
dB
.
The
eight
ranges
cover
the
instrument's
full
operating
range
from
+10
dBm
to
0
85
dBm
(see
Figure
6-6
).
A
power
range
can
be
selected
either
manually
or
automatically
.
Automatic
mode
If
you
select
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N
PWR
RANGE
AUTO
,
you
can
enter
any
power
level
within
the
total
operating
range
of
the
instrument
and
the
source
attenuator
will
automatically
switch
to
the
corresponding
range
.
Each
range
overlaps
its
adjacent
ranges
by 15
dB,
therefore,
certain power
levels
are
designated
to
cause
the
attenuator
to
switch
to
the next
range so
that optimum
(leveled)
performance
is
maintained.
These
transition
points
exist
at
0
10
dB from
the top
of
a
range
and
at
+5
dB
from
the
bottom
of
a
range.
This leaves
10 dB
of operating
range
.
By
turning
the
RPG
knob
with
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N
PORT
POWER
being
the
active
function,
you can
hear the
attenuator switch
as
these
transitions
occur
(see Figure
6-6).
Manual mode
If you select
NNNNNNNNNNNNNNNNNN
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PWR RANGE MAN
, you must rst enter the power ranges
menu and manually select
the power range that corresponds to the power level you want to use
. This is accomplished by
pressing the
NNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNN
POWER RANGES
softkey and then selecting
one of the twelve available ranges
.In
this mode
, you will not be able to use the step keys
,
front panel knob
, or keypad entry to select
power levels outside the range limits
. This feature is necessary to maintain accuracy once
a
measurement calibration is activated.
When a calibration is active, the power range selection is switched from auto to manual mode,
and
PRm
appears on the display.
Application and Operation Concepts 6-13
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