Getting
Started
Manual
918221
RevA
73
A
smart
control
of
these
intervals
allows
editing
very
long
modulating
signals
by
generating
the
carrier
at
its
maximum
frequency.
Summarizing
the
previous
statements,
the
maximum
duration
for
the
modulating
signal
is
67.076ms
for
M
‐
ASK
modulation
(MSRP
=
1,
Sampling
Rate
in
Setup
Sampling
Rate=
250
MHz)
and
4.29s
for
M
‐
PSK
and
M
‐
FSK
modulations
(Sampling
Rate
in
Setup
Sampling
Rate=
250
MHz).
Edit Modulation Rule
This
section
provides
information
for
setting
the
modulation
type
using
the
Modulation
type
control
(DDS
mode
only)
and
the
modulating
signal
using
the
Modulating
Table
and
the
Command
Bar
.
Modulation Type
This
control
allows
setting
the
modulation
type
(Frequency
or
Phase)
in
DDS
mode,
while
in
Arbitrary
mode
this
option
is
not
active
since
the
only
available
modulation
type
is
the
Amplitude
one.
•
Amplitude
(M
‐
ASK)
‐
In
an
Arbitrary
mode
channel
the
Modulation
Editor
tool
is
automatically
set
to
M
‐
ASK.
The
window
allows
setting
the
time
behavior
of
the
amplitude
modulation
factor.
The
samples
constituting
the
modulating
signal
may
assume
values
between
0
and
1.
These
samples
are
the
multiplying
factors
of
the
signal
carrier
amplitude.
•
Frequency
(M
‐
FSK)
‐
By
selecting
the
frequency
modulation,
the
Modulation
Editor
tool
is
set
to
M
‐
FSK.
The
window
allows
setting
the
time
behavior
to
be
assumed
by
the
carrier
signal.
The
samples
of
the
modulating
signal
can
assume
values
between
0
and
110
MHz.
•
Phase
(M
‐
PSK)
‐
By
selecting
the
phase
modulation,
the
Modulation
Editor
tool
is
set
to
M
‐
PSK.
The
window
allows
setting
the
phase
shifts
to
be
assumed
by
the
carrier
signal
and
the
time
instants
at
which
they
occur.
The
carrier
signal
is
generated
at
a
frequency
set
by
the
Base
Frequency
control
(maximum
110
MHz
for
a
ArbStudio
1102/1104
instrument),
while
samples
of
the
modulating
signal
may
assume
values
between
0
and
360
degrees.
Modulating Table
Each
row
of
the
Modulating
Table
represents
a
time
interval
in
which
the
modulating
signal
may
assume
Constant
values
or
Variable
values
•
Constant
Values
‐
The
modulating
signal
is
kept
at
a
constant
value
for
the
entire
interval
duration.
The
corresponding
row
in
the
Modulation
Table
is
called
an
Entry
.
•
Variable
Values
‐
The
modulating
signal
varies
within
the
time
interval,
following
a
predefined
behavior.
The
corresponding
row
in
the
Modulation
Table
is
called
a
Segment
.
The
first
column
contains
the
modulation
coefficients
or
the
Segment
names,
while
the
second
column
contains
the
corresponding
duration.
The
time
sequence
of
each
table
item
can
be
modified
by
dragging
an
entry
in
the
desired
position.
PLEASE
NOTE
THE
FOLLOWING
:
•
The
Duration
and
Amplitude
values
inserted
in
the
table
are
automatically
rounded
depending
on
the
sampling
rate
and
on
the
instrument
resolution.
•
The
Memory
Usage
indicator
visualizes
in
real
time
the
occupation
of
the
hardware
resources.
Command Bar
The
Command
contains
the
following
6
buttons
for
editing
the
Modulation
Table.
•
Clear
the
Modulation
Law
