Acquire Subsystem - HP 54501A Programming Reference Manual

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