HP 8753D - Page 338

Correcting for
Measurement Errors
The
4
CAL
5
key provides
access to
the
correction
menu
which
leads
to
a
series
of
menus
that
implement
the error-correction
concepts described
in
this
section.
A
ccuracy
enhancement
(error-correction)
is performed
as a
calibration
step
before
you
measure
a
test
device
.
When
the
4
CAL
5
key is
pressed, the
correction menu
is
displayed.
The
following softkeys
are
located
within
the
correction
menu:
NN
NN
N
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N
CORRECTION ON
off
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N
INTERPOL
on
OFF
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CALIBRATE
MENU
N
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RESUME
CAL SEQUENCE
N
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RECEIVER
CAL
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CAL
KIT
[
]
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PWRMTR
CAL
[OFF]
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PORT
EXTENSIONS
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VELOCITY
FACTOR
N
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SET
Z

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TEST
SET
SW
[
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ALTERNATE
A
and
B
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CHOP A
and B
Ensuring
a
V
alid
Calibration
Unless
interpolated
error-correction
is
on,
measurement
calibrations
are
valid
only
for
a
specic
stimulus
state
,
which
must
be
set
before
a
calibration
has
begun. The
stimulus state
consists
of
the
selected
frequency
range
,
number
of
points
, sweep
time,
output power
, and
sweep
type
.
Changing
the
frequency
range
,
number
of
points,
or
sweep
type
with
correction
on invalidates the calibration and turns it o. Changing the sweep time or output power
changes the status notation
Cor at the left of the screen to
C? , to indicate that the calibration
is in question. If correction is turned o or in question after the stimulus changes are made
,
pressing
N
NNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNN
CORRECTION ON off
recalls the original stimulus state for the current calibration.
Application and Operation Concepts 6-71