HP 8753D - Page 362

Power
Meter Calibration
The
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PWRMTR
CAL [
] softkey
within the
correction
menu,
leads
to
a
series
of
menus
associated
with
power
meter calibration.
An
HP-IB-compatible
power
meter can
monitor and
correct RF
source power
to achieve
leveled
power
at
the
test
port.
During a
power meter
calibration, the
power meter
samples
the
power
at
each
measurement
point
across
the frequency
band of
interest. The
analyzer then
constructs
a
correction
data
table to
correct the
power output
of
the
internal
source
.
The
correction
table
may
be
saved
in
an
instrument
state register
with the
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SAVE
key
.
The
correction
table
may
be
updated
on
each
sweep
(in
a
leveling
application)
or
during
an
initial
single
sweep
.
In
the
sample-and-sweep
mode
the
power
meter
is
not
needed for
subsequent
sweeps
.
The
correction
table
may
be
read
or
modied
through
HP-IB
.
Primary
Applications
when
you
are
testing
a
system
with
signicant
frequency
response
errors
(
F
or
example
,
a
coupler with
signicant
roll-o,
or
a
long
cable
with
a
signicant
amount
of
loss
.)
when
you
are
measuring
devices
that
are
very
sensitive
to
actual
input
power
for
proper
operation
when you
require a
reference
for
receiver
power
calibration
Calibrated
P
ower
Level
By
setting
the
analyzer
calibrated
power
to
the
desired
value
at
the
power
meter
,
this
power
level
will
be
maintained
at
that
port
during
the
entire
sweep
.
First
set
the
source
power
so
that
the power
at
the
test
device
is
approximately
correct.
This
reduces
residual
power
errors
when
only
one
reading
is
taken.
Refer
to
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NUMBER
OF
READINGS
softkey
description
in
Chapter
9,
\Key
Denitions
."
When
power
meter
calibration
is
on,
the
annotation
PC
is
displayed. This
indicates
that
the
source
power
is
being
updated
during
the
sweep
.
Calibrated
power
level
becomes
the
active
entry
if
any
of
the
following
softkeys
are
pressed:
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PWRMTR CAL
[OFF]
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EACH
SWEEP
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ONE
SWEEP
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POWER
(if
power
meter
cal is
on)
Regardless of the measurement application, the analyzer's source can only
supply corrected
power within the selected power range
. If power outside
this range is requested, the
annotation will change to
PC? .
Compatible Sweep Types
Power meter calibration may be used in linear
, log, list, CW
, and power sweep modes
. In power
sweep, the power at each point is the true power at the power meter
, not the power at the
analyzer's source output.
Application and Operation Concepts 6-95