Technical data

Chapter 3 37
Source List Sequencer Parameter Definitions
Source Parameters
Source List Sequencer Parameter
Definitions
Source Parameters
The parameters in the source sequence define the characteristics of the RF waveform to be generated,
and also control the timing and triggering of the sequence steps.
The settings defined by these parameters cannot change during the sequence step. To modify any of these
settings (for example, to change the frequency of the generated waveform), it is necessary to start a new
sequence step.
The 13 parameters which cannot change during a sequence step are described below.
1: Step Number
Source steps are numbered sequentially (1 through n), and executed sequentially. One source step must
end before the next step begins.
2: Step Trigger
This parameter specifies how the source step is to be triggered. The choices are:
• IMMediate (equivalent to Free Run); the source begins generating a waveform without waiting for a
trigger.
• KEY; the sequence is halted until the user presses the manual trigger key on the front panel. A popup
window is displayed to indicate that the test set is waiting for the trigger input. (Sending the Bus
Trigger SCPI command while the test set is waiting for a manual trigger had no effect.)
• BUS; the sequence is halted until the Bus Trigger SCPI command is sent (see the note below). A
popup window is displayed to indicate that the test set is waiting for the trigger input. (Pressing the
manual trigger key while the test set is waiting for the Bus Trigger SCPI command will have no
effect.)
• INTernal; the source step is triggered from the test set’s analyzer.
• EXTernal2; the source step is triggered from the TRIG IN 2 port on the rear panel of the test set.
NOTE The Bus Trigger SCPI command is in the form:
:SOURce:LIST:TRIGger:INITiate[:IMMediate]
The key path for selecting the Step Trigger from the front panel menus is:
[Source], List Sequencer, List Sequencer Setup, Step Trigger