User manual

Publication No. 980935 Rev. M 3152B User Manual
Astronics Test Systems Introduction 1-7
you may maximize the effective memory capacity by downloading
specific waveforms only when they are required.
For example, if
one part of your ATE sequence requires a complex waveform that
consumes nearly all of the waveform memory, you may delete this
waveform after that portion of your sequence is completed, and
then quickly download a new waveform for the ne
xt part of the
sequence.
Depending upon your application, you may be able to change
waveform parameters even more quickly without downloading new
data. After you download a waveform, you may
change the sample
clock frequency, amplitude, offset, and run mod
es without
disturbing the downloaded data.
The 3152B can divide its memory into smaller segments, and
then
use these segments to create complex sequences of waveforms.
The 3152B can generate, and even measure,
the following
functions:
• Standard waveforms. The 3152B computes t
hese automatically
from its built-in equations for sine, square, triangle,
and other
common waveforms.
• Arbitrary waveforms. Download these
to the instrument
whenever you need to change from one arbitrary waveform to
another.
• Waveform sequences. The
3152B builds sequenced waveforms
from memory segments that are loaded with the waveforms and
are referenced in the sequence table in advance.
•
Modulated signals. A direct digital synthesis (DDS) circuit
creates these signals without downloading a waveform.
•
Pulses. The ArbConnection controls for pulse waveforms have
the look and feel of a standard pulse generator. However, after
you use the controls to specify the pulse waveform, the
3152B
creates it digitally in the arbitrary waveform memory.
• Half-cycle waveforms. Half-
cycle waveforms are similar to
standard waveforms, but a programmed delay interval
separates the half cycles.
• Phase-Lock Loop (PLL) mode
. This special function allows
phase locking to an external signal regardless of the wave
shape and frequency of that signal. While locked to the external
signal, the
3152B can generate any of the above functions, with
the added control that is attributed to the external signal.
• Counter/timer. The 3152B also
performs counter/timer
measurements.
Run
Modes
The 3152B has two run modes that determine when it will output a
waveform. Continuous Run is the basic mode for generating a
waveform that does not stop. This mode is appropriate except