Data Acquisition Types; Normal - HP 54501A Programming Reference Manual

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