Selects the position of the external trigger. The Analyzer waits for
external trigger:
ï‚· Before sampling, when the frequency of the stimulus port have
been set.
ï‚· Before the frequency setup and subsequent measurement. The
frequency change of the stimulus port begins when the external
trigger arrives.
Depending on the command TRIG:SEQ:POIN the external trigger wait
occurs before each point or before the first point of the full sweep cycle.
(command/query)