HP 54501A - Data Acquisition Types; Normal

Data
Acquisition
Types
There
are
three
types
of
waveform
acquisition
that
can
be
selected with
the
:ACQUIRE:TYPE
command.
The three
types
are
NORMAL,
AVERAGE,
and
ENVELOPE.
When
the
data
is
acquired
using
the
DIGITIZE
command
the
data
is
placed
in the
channel
buffer
of
the
specified
source.
After
a
DIGITIZE
command
the
instrument
is
stopped.
If
the
instrument
is
restarted,
over
the
HP-IB
or
the
Front
Panel,
the
data
acquired
with the
DIGITIZE
command
will
be
overwritten.
Note
The
on-screen
time
is
divided
into
a
specific
number
of
horizontal time
points
as
defined
by
the
^4CQUIRE:POINTS
command.
Each
of
these
increments
in
time
is
referred
to as
a
time
bucket
with
each
time bucket
having
a fixed
time
associated
with
it.
Normal
Normal
data
consists
of the last
data
point
(hit)
in
each
time
bucket.
This
data
is
transmitted
over
HP-IB
in
a
linear
fashion
starting
with
time
bucket
0
and
going
through
time bucket
n-1,
where
n
is
the
number
returned
by
the
WAVEFORM:POINTS
query.
Time
buckets that don't
have
data
in
them
return
-1.
Only
the
magnitude
values
of each data
point
are
transmitted,
the
time
values
correspond
to
the
position
in the
data
array.
The
first
voltage
value
corresponds
to
the
first
time
bucket
on
the
left
of
the
CRT
and the
last
value
corresponds
to
the
next
to
last
time
bucket
on
the
right
side
of
the
CRT.
Waveform
Subsystem
17-2
HP
54501A
Programming