4
MEAS
5
key provides
access to
a series
of softkey
menus for
selecting
the
parameters or
inputs to
be measured.
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MEASURE RESTART
aborts
the sweep
in progress
, then
restarts the
measurement.
This
can be
used to
update a
measurement following
an
adjustment
of the
device under
test. When
afull
two-port
calibration
is
in use
,the
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MEASURE
RESTART
key will
initiate
another
update
of
both
forward
and
reverse
S-parameter
data.
This
softkey
will
also
override
the
test
set
hold
mode
,
which
inhibits
continuous
switching
of
either
the
test
port
transfer
switch
or
step
attenuator
.
The
measurement
congurations
which
cause
this
are
described
in
T
est
Set Attenuator
,T
est
P
ort
Transfer
Switch,
and
Doubler
Switch
Protection,
at the
beginning
of
this
section.
This
softkey
will
override
the test
set
hold
mode
for
one
measurement.
If
the
analyzer
is
taking a
number of
groups (see
Trigger
Menu),
the
sweep
counter
is
reset
at 1.
If averaging
is
on,
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N
MEASURE
RESTART
resets
the
sweep-to-sweep
averaging
and
is
eectively
the
same
as
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N
AVERAGING
RESTART
.
If
the
sweep
trigger
is
in
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N
HOLD
mode
,
N
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N
MEASURE
RESTART
executes
a
single
sweep
.
N
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N
MEMORY
displays
the trace
memory
for
the
active
channel.
This
is
the
only
memory display
mode
where
the
smoothing
and
gating
of
the
memory trace
can
be
changed.
If
no
data
has
been
stored
in
memory
for this
channel,
a
warning
message
is
displayed.
4
MENU
5
provides
access to
a
series
of
menus
which
are
used
to
dene
and
control
all
stimulus
functions
other
than
start,
stop
,
center
,
and
span.
When
the
4
MENU
5
key
is
pressed,
the
stimulus
menu
is
displayed.
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N
MIDDLE
VALUE
sets
the
midpoint
for
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DELTA
LIMITS
.
It
uses
the
entry
controls
to
set
a
specied
amplitude
value
vertically
centered
between
the
limits
.
N
N
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N
MIN
moves
the
active
marker
to
the
minimum
point
on the
trace.
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MINIMUM
FREQUENCY
is used
to dene
the lowest
frequency at
which
a
calibration
kit standard
can be
used during
measurement calibration.
In
waveguide
,
this must
be
the
lower
cuto
frequency
of
the
standard, so that the analyzer can calculate dispersive eects
correctly (see
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NN
OFFSET DELAY
).
NNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNN
MKR SEARCH [ ]
leads to the marker search menu, which is used to search the
trace for a particular value or bandwidth.
NNNNNNNNNNNNNNNNNNNN
NNNNNN
MKR ZERO
puts a xed reference marker at the present active marker
position,
and makes the xed marker stimulus and response
values at
that position equal to zero
. All subsequent stimulus
and response values of the active marker are then read out
relative to the xed marker. The xed marker is shown on the
display as a small triangle 1 (delta), smaller than the inactive
marker triangles. The softkey label changes from
NNNNNNNNNNNNNNNNNNNNNNNNNN
MKR ZERO
to
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MKR ZERO 1REF = 1
and the notation \1REF = 1" is displayed
at the top right corner of the graticule. Marker zero is canceled
9-24 Key Denitions
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