Agilent Technologies 4395A - Markers

Markers
Markers
Three
Types
of Markers
Three
types
of markers
are provided
for each
channel. The
rst is
the movable
marker that
is
displayed
on
the
screen
(as
5
) when
4
Ma
rk
er
5
,
4
Mak
er
!
5
,
4
Sea
rch
5
,
or
4
Utilit
y
5
is
pressed.
When
a
marker
is
turned
on
and
no
other function
is active
,the
marker can
be
controlled
with
the
knob
,
or
the
step
keys
.
The
second
is the
sub-markers that
appear at
the present
marker
position
when
a
softkey
in
the
sub-marker
menu is
pressed. The
seven sub-markers
can be
displayed
for
each
channel
at
same
time
(a total
of 14).
The
third
is
the
1marker that
denes a
reference position
of
the
delta
mode
.
This
type
of
marker
includes
three
variations:
1marker(normal), tracking
1marker,
and xed
1marker
.
Marker
V
alue
Markers
have
a sweep
parameter
value
(the
x-axis
value
in
a
Cartesian
format)
and
a
measurement
value
(the
y-axis
value
in
a
Cartesian
format).
In
a
polar
,
Smith,
or
admittance
chart format,
the second
part of
a
complex
data
pair
is
also
provided
as
an
auxiliary
measurement value
.
The
marker
can be
moved to
any
point
on
the
trace
,
Its
measurement
and
sweep
parameter
values
are
displayed at
the top
right
corner
of
the
graticule
for
each
displayed
channel
(in
units
appropriate
to
the
display
format).
The
displayed
marker
measurement
values
are
valid
even
when
the
measured
data
is
above
or
below
the
range
displayed
on
the
graticule
.
When
marker
list
is
turned
on,
sweep
parameter
values
and
measurement
values
of
all
markers
are
listed
on
the
graticule
.
In
a
polar
,
Smith
,
or
admittance
chart
format,
auxiliary
measurement
values
of
all
markers
are
also
listed.
Marker
Time
Mode
When
marker
time
mode
is
turned
on, the
x-axis is
changed to
the time
scale
.
The
start
point
of
the
x-axis
is
0
seconds
and the
stop point
indicates the
sweep time
.
The
markers
have
a
time
instead
of
a
sweep
parameter
value
.
Continuous/Discrete
Mode
Marker
values
of
the
network
analyzer are
normally continuous
(that is
, they
are interpolated
between
measured
points).
Alternatively
,
they
can
be
set
to read
only
discrete
measured
points. The marker of the spectrum analyzer always reads only the discrete measured point.
Marker on the Data Trace or on the Memory Trace
If both data and memory are displayed, you can select which marker values apply to the data
trace or the memory trace
. If data or memory is displayed (not both), the marker values apply
to the trace displayed. In a data math display (data+memory
,data
0 memory, or data/memory),
the marker values apply to
the trace resulting from the memory math function.
A-32 Basic Measurement Theory