User`s manual

The segment sequence determines the order in which the waveform
segments in memory are to be output, which order is assigned by the user
(use
[SOURce:]LIST[1]:SSEQuence:SEQuence <segment_list>).
Each segment sequence must be stored into the AFG’s sequence memory.
To do this, you must assign a unique name (use
[SOURce:]LIST[1]:SSEQuence:SELect <name>) for each segment
sequence to be stored into memory. This allows you to select one of many
segment sequences, which may exist in memory, to be output. Legal names
must start with an alphabetic character, but can contain alphabetic, numeric,
and underscore (“_”) characters. The names can have a maximum length of
12 characters. The AFG generates an error for duplicate names.
The waveform segment names in a segment sequence can either be sent as
names or as an address value (see Chapter 7 for more information).
To output a waveform, the AFG sets the DAC to the voltage value of each
waveform segment in the segment sequence. The sample frequency determines
the rate at which the DAC is set to the different voltage values. Depending on
the sample source selected (by
TRIGger[:STARt]:SOURce <source>), the
sample rate is set by the DDS (frequency1) frequency generator
(
[SOURce:]FREQuency[1]), Divide-by-N (frequency2) frequency generator
(
[SOURce:]FREQuency2), or the samples rates of the external sample sources.
The sample rate and the number of points in the waveform segment
determine the waveform repetition frequency. The repetition frequency is
the sample rate / number of points.
Chapter 3 Generating Arbitrary Waveforms 87