HP 8753D - Page 339

Interpolated
Error-correction
Y
ou can
activate the
interpolated error-correction
feature with
the
N
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INTERPOL
ON off
softkey.
This
feature
allows
you
to
select a
subset of
the frequency
range or
a dierent
number of
points
without
recalibration.
When
interpolation
is on,
the system
errors for
the newly
selected
frequencies
are
calculated
from
the
system errors
of the
original calibration.
System
performance
is
unspecied when
using interpolated
error-correction. The
quality
of
the
interpolated
error-correction
is
dependent on
the amount
of phase
shift
and
the
amplitude
change
between
measurement
points
.If
phase shift
is no
greater
than
180

per
approximately
5
measurement
points
,
interpolated error-
correction oers
a great
improvement
over
uncorrected
measurements
.
The
accuracy of
interpolated error-correction
improves as
the
phase shift
and amplitude
change between
adjacent points
decrease
.
When
you
use
the
analyzer
in linear
frequency sweep
, perform
the original
calibration
with
at
least
67
points
per
1
GHz of
frequency span
for greatest
accuracy with
interpolated
error-correction.
Interpolated
error-correction is
available i n
three sweep
modes: linear
frequency
,
power
sweep
,
and
CW time
.
Note
If
there
is
a
valid
correction
array
for
a
linear
frequency
sweep
,
this
may
be
interpolated
to
provide
correction
at
the
CW
frequency
used
in power
sweep
or
CW
time
modes
.
This
correction
is
part
of the
interpolated error-correction
feature
and is
not specied.
6-72 Application and Operation Concepts