Getting
Started
Manual
918221
RevA
33
•
CF
=
Voltage
Read
at
the
load
/
Nominal
voltage
at
the
load.
For
example
if
the
value
read
is
4.9
V,
CF=4.9
V/5
V
=
0.98
Sampling Settings
This
section
of
the
General
Tab
allows
for
dividing
sampling
Base
Frequency
(see
Setup
Sampling
Rate
Section)
for
both
the
signal
carrier
and
for
a
possible
M
‐
ASK
modulating
signal,
respectively.
C
ARRIER
W
AVEFORM
•
Sampling
Rate
Prescaler
(SRP)
may
assume
values
ranging
from
1
(maximum
frequency)
up
to
16777216
(minimum
frequency),
by
multiples
of
2.
•
The
optimal
selection
of
SRP
must
take
into
account
both
the
maximum
frequency
of
the
signal
to
be
generated
and
its
duration.
•
The
limit
on
the
maximum
frequency
comes
from
the
Nyquist
sampling
theory
which
imposes
a
frequency
generation
at
least
two
times
the
maximum
frequency
of
the
signals
generated.
For
example,
if
a
sinusoid
must
be
generated
at
10
MHz,
its
sample
frequency
generation
must
be
at
least
20
Msps.
In
that
case,
however,
the
sinusoid
period
is
represented
by
only
2
points.
ArbStudio
has
a
set
signal
duration
limit
for
the
memory
depth
used
while
saving
waveform
samples.
In
fact,
the
memory
space
allocated
to
the
sample
storage
makes
the
waveform
duration
inversely
proportional
to
the
generation
frequency.
In
particular,
the
maximum
duration
of
a
waveform
is
given
by
the
number
of
possible
samples
divided
by
the
generation
frequency.
For
example,
a
maximum
frequency
of
250
Msps
and
a
memory
depth
of
2,097,152
samples,
done
by
setting
SRP
=
1
(sampling
rate
=
250
Msps),
can
have
saved
waveforms
with
a
total
length
of
8.388608
ms
and
a
time
resolution
of
4
ns.
However,
by
setting
SRP
=
20
(sampling
rate
=
12.5
Msps),
the
total
waveform
length
becomes
167.77216
ms
with
a
time
resolution
of
80
ns.
M
ODULATING
W
AVEFORM
When
M
‐
ASK
modulation
is
used
you
can
set
Mod
Sampling
Rate
Prescaler
(MSRP)
for
the
modulating
signal
independent
of
the
carrier
signal.
•
MSRP
may
assume
values
ranging
from
1
(maximum
frequency)
up
to
65532
(minimum
frequency),
by
multiples
of
4.
•
The
optimal
selection
of
MSRP
must
take
into
account
both
the
maximum
frequency
of
the
signal
to
be
generated
and
its
duration.
For
example,
an
ArbStudio
1102/1104
with
a
maximum
frequency
of
125
Msps
(on
the
modulating
signal)
and
a
buffer
depth
of
2,096,896
samples
in
static
mode,
done
by
setting
SRP
=
1
(sampling
rate
=
125
Msps),
you
can
save
a
modulating
waveform
with
total
length
of
16.775168
ms
and
a
time
resolution
of
8
ns.
