HP 8753D - Page 364

Figure 6-54.
Test
Setup for
Continuous
Sample
Mode
Sample-and-Sweep
Mode
(One
Sweep)
Y
ou
can
use the
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N
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N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
ONE
SWEEP
softkey
to activate
the sample-and-sweep
mode.
This
will
correct
the analyzer
output
power
and
update
the
power
meter
calibration
data
table
during
the
initial
measurement sweep
.
In
this
mode
of
operation,
the
analyzer
does
not
require
the
power
meter
for
subsequent
sweeps
.
Y
ou
may
use
a
power
splitter
or
directional
coupler
,
or
simply
connect
the
power
sensor
directly
to
the
analyzer
to
measure
the
power
for
the
initial
sweep
prior
to
connecting
and
measuring
the
test
device
(see
Figure
6-55
).
The
speed
of
the
calibration
will
be
slow
while
power
meter
readings
are
taken
(see
Table
6-6
).
However
,
once
the
sample
sweep
is
nished,
subsequent
sweeps
are
power-corrected
using
the
data
table
,
and
sweep
speed
increases
signicantly
.
Once
the
initial
sweep
is
taken,
sample-and-sweep
correction
is
much
faster
than
continuous
sample
correction.
If
the
calibrated
power
level
is
changed
after
the
initial measurement
sweep is
done
,
the
entire
correction
table
is
increased
or
decreased
by
that
amount
and the
annotation PCo
(indicating
power
calibration
oset)
appears
on
the
display
.The
resulting power
will no
longer be
as
accurate
as
the
original
calibration.
Figure 6-55. Test Setup for Sample-and-Sweep Mode
Application and Operation Concepts 6-97