RIGOL DSG3000 Series - Manual (Page 58)

RIGOL Chapter 2 Front Panel Operations
2-18 DSG3000 User’s Guide
 Bus Trigger
After selecting “Bus” trigger, if the sweep mode is set to “Cont”, the
instrument starts to sweep a point each time the “*TRG” command is sent.
If the sweep mode is “Single”, press Single to meet the single sweep
condition. At this point, the instrument starts to sweep a point and stops
after the sweep period is finished each time the “*TRG” command is sent.
 External Trigger
In external trigger mode, the RF signal generator accepts the trigger signal
input from the [TRRIGER IN] connector (as shown in the figure below) at
the rear panel. If the sweep mode is set to “Cont”, the instrument starts to
sweep a point each time a TTL pulse signal with specified polarity is
received. If the sweep mode is “Single”, press Single to meet the single
sweep condition. At this point, the instrument starts to sweep a point and
stops after the sweep period is finished each time a TTL pulse signal with
specified polarity is received.
To specify the polarity of the TTL pulse signal, press Trig Slope to select
“Pos” or “Neg” and the default is “Pos”.
Explanation
When executing the sweep operation, the priority order of the conditions is
Single Sweep  Trigger Mode  Point Trigger Mode. For example, when
both the trigger mode and point trigger mode are set to “Key” trigger:
 In “Cont” sweep mode, press Trigger to meet the trigger mode of the
whole period and then press Trigger again to meet the trigger mode
of points within the sweep period; then, the instrument starts to
sweep.
 In “single” sweep mode, press Single to meet the single sweep
condition and then press Trigger twice to meet the sweep period
trigger mode and point trigger mode respectively. Then, the
instrument starts to sweep.