3 Sequencing
114 Keysight M8195A Revision 2 – Arbitrary Waveform Generator User’s Guide
3.3.3 Gated
In the trigger mode Gated, both edges of the gate signal are used to start and stop the
execution of the sequencer. After being stopped, the sequencer is prepared to accept a
new rising edge of the gate and can be restarted again.
In Gated Mode, the advancement mode of the top level (e.g. sequence advancement
mode for sequences) must be set to Continuous.
Sometimes it is desired to play an idle waveform instead of a static idle value before
having started to play the real waveform. With the arm mode it is possible to select the
output signal of the instrument before having started the sequencer.
Whenever the arm mode is set to Self Armed, the instrument starts as defined by the
selected trigger mode.
For all cases where the trigger mode is set to Continuous and the arm mode to Armed,
the first segment/sequence is played infinitely after start. After having received a rising
edge of Enable, the sequence/scenario advances to the next segment/sequence and
continues to execute as described in trigger mode Continuous. This mode doesn’t make
any sense for the execution of standalone segments or for the trigger modes Triggered
and Gated. Therefore, in these cases the described behavior is not available and Armed
is treated like Self Armed with an additional enable flag as start condition.
The advancement mode specifies the way of how one element like a segment, sequence
or scenario advances to the next element or how it is repeated.
The advancement mode can be individually specified for each single element. The exact
behavior depends on the sequencing, arm and trigger mode.
There could be different advancement modes on different hierarchy levels. Some of
these modes require an advancement event to proceed. In cases where the
advancement event has to be evaluated simultaneously in multiple hierarchy levels, the
output behavior could be unexpected, especially when conditional advancement modes
are used. For more details, refer to the examples given in the section Sequencer Modes.
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