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Selecting
Sequence Advance
Modes
Figure 3-19, Editing the Sequence Table
As was explained above, the 2074 steps through an index of links;
It may loop a few times on a designated link and eventually, after
the last link, the process repeats itself. Stepping from link to link
through the sequence table is done automatically by the instrument.
However, there are applications requiring control when and how the
link is stepped. The 2074 has a number of sequence advance
options: Auto, Stepped, Single and Mixed. These advance modes
are described in the following.
Automatic – specifies continuous advance where the generator
steps continuously and automatically through the links to the end of
the sequence table and then repeats the sequence from the start.
For example, if a sequence is made of three segments – 1, 2, and
3, and AUTO mode is used, the sequence will generate an infinite
number of 1, 2, 3, 1, 2, 3, 1, 2, 3...waveforms. Of course, each link
(segment) can be programmed with its associated loop (repeat)
number. AUTO is the default sequence advance mode. Note, to use
this mode, the 2074 must be in continuous operating mode.
Stepped – Using this advance mode, the sequence is advanced to
the next link only when a valid trigger is received. The output of the
2074 generates the first segment continuously until a trigger signal
advances the sequence to the next link. If repeats were selected for
a segment, the loop counter is executed automatically. Note,
although the trigger input controls advanced steps, to use this
mode, the 2074 must be in continuous operating mode.
Single – Using this advance mode, the 2074 idles between steps
until a valid trigger signal is sensed. The single advance mode
requires that the 2074 be in trigger operating mode only. An attempt
to select the Single advance mode when the instrument is in
continuous operating mode can not be done. When triggered, the
generator outputs one waveform cycle. Then, the output level idles
at a DC level equal to the last point of the last generated waveform.
If loops were programmed, the output will repeat this segment for n
times automatically. Only after executing all of the programmed
Using the Instrument
Generating Sequenced Waveforms
3
3-43
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