Agilent Technologies 8504B - Page 90

FINAL TRIM SIZE : 7.5 in x 9.0 in
P
erforming
Measurements
Using Markers
Markers
are
accessed
from
two
front-panel
keys:

Use
4
MRK
5
to
display
up
to
four
markers
,
an
additional
xed
marker
,
and
delta
markers
.

Use
4
MKR
F
CTN
5
to
search
for
peak
responses
and
to
change
the
measurement
span
based
on
marker
positions
.
The
active
marker
can
be
moved
to
any
point
on
the trace
.When
a
logarithmic
amplitude
scale
is
used,
response
values
are
displayed
in
dB;
when
a
linear
amplitude
scale
is
used,
values
are
shown
as the
ratio of
reected
power
to
the
incident
power
.
The
displayed
marker
values
are
valid
even
when
the
measured
data
is
above
or
below the
range displayed
on the
screen.
1
markers
display
relative
values
When
displaying
delta
markers
,
any
of
the
four
markers
or
axed
point can
be
designated
as
the
reference
marker
.
The
displayed
markers
show
the
relative
distance
(or
time)
and
amplitude
from
this
reference
marker
.
The
delta
reference
is
displayed
as
a
small
1 character
. (This
character
is
smaller
than
the
inactive
marker
triangles
.)
If
one of
the markers
is
the
reference
,
the
delta
character
appears
next
to
the
marker
number on
the trace
.
The
xed
marker
is
a
special
delta
marker
reference
Each
of
the
four
standard
markers
can
only
be
positioned
on
the trace
.
However
,
the
xed
marker
can
be
position
anywhere
on
the
screen; it
is
not
limited
to
the
trace
.
Use
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FIXED
MKR
POSITION
and
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N
FIXED
MKR
VALUE
to
position
the
xed
marker
.
The
xed
marker
can be
set to
the
current
active
marker
position,
by
pressing
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MARKER
!
FIXED
MARKER
.
Other
markers can
then
be activated
and
their
values
referenced
to
the
xed
marker
.
What
if a
memory trace
is
displayed?
If
both data
and memory
are displayed,
the marker
values
apply
to
the
data
trace
.
If
memory
only
is
displayed,
the
marker
values
apply
to
the
memory
trace
.
Y
ou
can
dene
a
peak
Y
ou
can change
the
amplitude
variation
required
for
a
peak
to
be
identied.
The default value is 6 dB
. The value species the amount that a trace must
increase and
then decrease, relative to the surrounding responses or noise
oors,in
order to be dened as a peak.
If peak excursion is
dened as 20 dB
, then the values of
a and b , shown
in the following gure
,
must be at least 20 dB in order to be considered a
3-13
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