HP 54501A - Acquire Subsystem

Acquire Subsystem
8
Introduction
The
ACQUIRE
subsystem
commands
set
up
conditions
for
executing
a
DIGITIZE
root
level
command to
acquire
waveform
data.
This
subsystem
selects
the
type
of
data,
the
number
of
averages,
and
the
number
of data
points.
See
figure
8-1 for
the
Acquire
subsystem
commands
syntax diagram.
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.
The
ACQUIRE
subsystem
is
also
the
only
HP-IB
control
for
two
display
parameters:
Display
Mode
and
Number
of
Averages.
There
is
a
coupling
between
the
front
panel
and
the ACQUIRE
subsystem
parameters.
This
means
that
when
the
HP-IB
parameters
for
ACQUIRE
TYPE
or
COUNT
are
changed,
the
front
panel
will
change.
Also,
when
the
front
panel
parameters
are
changed,
the
HP-IB
parameters
will change.
(Normal)
Persistence
Mode
The
:ACQUIRE:TYPE
NORMAL
command
will
set
the HP
54501A
to
the
variable
persistence
mode.
The
front
panel
user
activates
the
same
mode
by
selecting
the
Display
menu,
then
setting
the
display
mode
to
Normal.
The
persistence
time
is
set
via
the
HP-IB
in
the
DISPLAY
subsystem
using
the
:DISPLAY:PERSISTENCE
command.
The
:ACQUIRE:COUNT
can
be
set in
this
mode,
but has
no
impact
on
the
current
display
mode
or
HP-IB
acquisition.
The
:ACQUIRE:COUNT
query
will always
return
a
1
when
the
acquisition
type
is
set
to
Normal.
HP
54501A
Programming
Acquire Subsystem
8-1