Publication No. 980935 Rev. A
3152B User Manual
EADS North America Test and Services
Introduction 1-7
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
when the application requires synchronization to external events.
In Interrupted Run mode, the output is either triggered or gated by
external signals. The 3152B accepts a trigger event from the front
panel connector, a backplane trigger line, or a software command
from your computer.
The Run mode and triggering are discussed later in this chapter.
Frequency
Control and
Accuracy
An internal reference determines the frequency accuracy of the
output waveform. The internal reference provides 1 PPM accuracy
and stability over time and temperature. For applications that
require better accuracy and stability, or just clock synchronization
to external devices, the 3152B can use the CLK10 VXIbus signal or
the front panel 10MHz REF IN signal (which is available only on the
3100M/R-3152B versions and on the 3151B).
Phase-Lock Loop
(PLL)
By activating the Phase-Locked Loop (PLL) function, you may
generate any standard or arbitrary waveform while synchronizing
with an external signal, or even while tracking it as its frequency
changes. This feature is not available on the 3151B model.
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