EasyManua.ls Logo

HP 54520 Series - Page 179

HP 54520 Series
292 pages
Save Page as PDF
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
Math/FFT
Menu
FFT
Softkeys
Center
Freq
Softkey
The
center
frequency
softkey
allows
centering
of
the
frequency
record
to
the
desired
frequency
when
horizontal
magnify
is
set
to
on.
#
of
Points
Softkey
The
#
of
points
softkey assigns
the
number
of
data
points
to
be
used
for
the
FFT
computation.
The
number
of
points
affects
the
computation
speed,
frequency
resolution,
and
the
noise
floor.
The
frequency
resolution
of
an
FFT
is
Fs/N,
where
F's
is
the
sampling
frequency
and
N
is
the
number
of
points.
The
maximum
signal-to-noise
ratio
of
an
FFT
is
related
to
both
the
A/D
converter
bits
of
resolution
and
the
number
of
points.
An
FFT
performed
on
a
small
number
of
points
is
computed
faster.
But,
an
FFT
performed
on
a
large
number
of
points
has
better
frequency
resolution
and
a
lower
noise
floor.
The
resolution
affects
how
accurately
frequencies
are
measured
and
how
well
two
frequencies
that
are
close
together
are
resolved.
If
the
oscilloscope
is
in
the
repetitive
mode,
or
the
operand
is
a
memory
that
was
stored
from
the
repetitive
mode,
the
number
of
points
defaults
to
512
and
cannot
be
changed.
When
the
operand
is
a
repetitive
source,
onscreen
data
is
used
for
the
FFT.
When
the
operand
is
a
real-time
source,
the
FFT
is
performed
on
data
in
the
selected
record
length,
but
not
necessarily
on
the
data
that
is
displayed
on
the
screen.
The
points
used from
the
record
are
selected
based
on
the
time
base
reference
setting
of
left,
center,
or
right.
When
the
reference
is
set
to
left,
data
at
the
beginning
of
the
record
is
used.
When
center
is
selected,
data
in
the
middle
of
the
record
is
used.
When
right
is
selected,
data
at
the
end
of
the
record
is
used.
10-12

Other manuals for HP 54520 Series

Preview: Service Guide
Service Guide138 pages

Related product manuals