HP 8753D - Page 495

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COUNTER:
DIV FRAC
N
switches
the counter
to count
the A14
fractional-N V
CO
frequency
after it
has been
divided down
to 100
kHz for
phase-locking
the V
CO.
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COUNTER: FRAC
N
switches
the counter
to count
the A14
fractional-N
V
CO
frequency
at the
node shown
on the
overall
block
diagram.
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COUNTER: OFF
switches
the
internal
counter
o
and
removes
the
counter
display
from
the
LCD
.
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COUPLED CH
on OFF
toggles
the
channel
coupling
of
stimulus
values
.
With
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COUPLED CH
ON (the
preset
condition),
both
channels
have
the
same
stimulus
values
(the
inactive
channel takes
on the
stimulus
values
of
the
active
channel).
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CW
FREQ
is
used
to
set
the
frequency
for power
sweep and
CW time
sweep
modes
.
If
the
instrument
is not
in either
of these
two
modes
,
it is
automatically switched
into CW
time mode
.
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CW
TIME
turns
on
a
sweep
mode similar
to an
oscilloscope
.
The
analyzer
is
set
to
a
single
frequency
,
and
the
data
is displayed
versus
time
.
The
frequency
of
the
CW
time
sweep
is
set
with
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CW
FREQ
in
the
stimulus
menu.
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D2/D1 to
D2 on
OFF
this
math
function
ratios
channels
1
and
2,
and
puts
the
results
in the
channel
2
data
array
.
Both
channels
must
be
on
and
have the
same
number
of
points
.
Refer
to
Chapter
2,
\Making
Measurements" for
information
on
how
to
use
this
function
to
make gain
compression
measurements
.
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DATA
and
MEMORY
displays
both
the
current
data
and
memory
traces
.
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DATA
ARRAY
on
OFF
species
whether
or
not
to
store
the
error-corrected
data on
disk
with
the
instrument
state
.
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DATA/MEM
divides
the
data
by
the
memory
,
normalizing the
data to
the
memory
,
and
displays
the
result.
This
is useful
for ratio
comparison
of
two
traces
,
for
instance in
measurements of
gain
or
attenuation.
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DATA -
MEM subtracts
the memory
from
the
data.
The
vector
subtraction
is
performed on
the complex
data. This
is appropriate
for
storing
a measured
vector error
, for
example directivity
,
and
later
subtracting it
from the
device measurement.
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DATA ! MEMORY
stores the current active measurement data in the memory of
the active channel. It then becomes the memory trace
, for use
in
subsequent math manipulations or display
. If a parameter
has just
been changed and the * status notation is displayed at
the left
of the display
, the data is not stored in memory until
a clean sweep
has been executed. The gating and smoothing
status of the trace are stored with the measurement data.
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DATA ONLY on OFF
stores only the measurement data of the device under test
to a
disk le. The instrument state and calibration are not stored.
This is faster than storing with the instrument state, and uses
less disk space. It is intended for use in archiving data that will
later be used with an external controller, and cannot be read
back by the analyzer.
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DECISION MAKING
presents the sequencing decision making menu.
Key Denitions 9-9