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Getting Started 1-6
Gated Mode
In gated mode, the Model 3152 circuits are armed to generate
output waveforms as long as a gating signal is true. Unlike the
triggered mode, the gated mode is level sensitive. When the gating
signal goes false, the waveform at the output connector is first
completed and the output goes to an idle state. The stop amplitude
level, after a gating signal, is the last point on the waveform.
Output Type
The Model 3152 can output three types of waveforms: standard
waveforms, arbitrary waveforms and sequenced waveforms. The
three types of waveforms are described in the following.
Standard Waveforms
The Model 3152 generates waveforms from a memory that has to
be loaded before the instrument can generate waveforms. There
are 64K points of memory standard, 256K and 512K points
available as an option. 1K points from this memory are allocated for
standard waveforms. Waveforms are loaded into this part of the
memory each time a standard function is selected.
The Model 3152 can be programmed to output nine different
standard waveforms: sine wave, triangular wave, square wave,
pulse, ramp, sinc (sine(x)/x), gaussian pulse, exponential pulse and
DC. There are certain parameters that are associated with each
standard function. These parameters can be programmed to
generate modified standard waveforms.
Arbitrary Waveforms
The arbitrary waveform memory is capable of storing one or more
user waveforms. There are 64536 points (523288 optional) that can
be allocated to one waveform that has this length. If there is no
need to use the complete memory, it can be divided into smaller
segments, variable in size. Load each segment with a different
waveform and program the Model 3152 to output the required
waveform for a specific test. Loading data to arbitrary waveform
memory can be a time-consuming task, especially if the complete
512K is loaded in one shot. The Model 3152 utilizes the VXIbus
shared memory concept that speeds data transfer from and to the
host computer. In this mode, the memory bank is disconnected
from the CPU circuit and its bus is accessible from the VXIbus for
direct memory access by the host computer.
Sequenced Waveforms
The Model 3152 employs a sophisticated circuit that allows dividing
the memory into smaller segments, linking of the segments in user-
defined order, and repeating of each linked segment up to one
million times. The sequence circuit is useful for generating long
waveforms with repeated sections. The repeated waveform has to
be programmed once and the repeater will loop on this segment as
many times as selected. When in sequenced mode, there is no loss
of time between linked or looped segments. Figure 1-4 shows an
example of a sequenced waveform. Assume the waveforms in
Figures 1-1 through 1-3 were placed in segments 1 through 3.
Содержание 3152
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Страница 63: ...Using The Instrument 3 38 This page was intentionally left blank...
Страница 80: ...SCPI Command Reference 4 17 Figure 4 1 SCPI Status Registers...
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