Sequoia Series 167
6.5.2 Initiating the Output Trigger System
When the source is turned on, the trigger subsystem is in the idle state. In this state, the trigger
subsystem ignores all triggers. Sending the following commands at any time returns the trigger system
to the Idle state:
ABORt
*RST
The INITiate commands move the trigger system from the Idle state to the Initiated state. This enables
the power source to receive triggers. To initiate for a single triggered action, use:
INITiate:IMMediate
After a trigger is received and the action completes, the trigger system will return to the Idle state. Thus
it will be necessary to initiate the system each time a triggered action is desired. To keep a trigger
system initiated for multiple actions without having to send an initiate command for each trigger, use:
INITiate:CONTinuous ON
Selecting the Trigger Source
The trigger system is waiting for a trigger signal in the Initiated state. Before generating a trigger, a
trigger source must be select.
To select IEEE-488 bus triggers (group execute trigger, device trigger, or *TRG command), use:
TRIGger:SOURce BUS
To select a trigger source that is always true, use:
TRIGger: SOURce IMM
The immediate source can be combined with INITiate:CONTinuous ON to generate repetitive output
transients. A transition from the Initiated state to the Delay state is made when the trigger signal is
received.
6.5.3 Synchronizing Output Changes to a Reference Phase Angle
An output transient normally occurs immediately when the trigger signal is received. For some
applications it is desirable for the transient to be synchronized with a particular phase of the output
waveform such as the zero crossing point (0°) or the positive peak (90°).
To synchronize the start of a transient with a particular phase angle of the internal phase reference,
you must select PHASE as the trigger source. Use:
TRIGger:SYNC:SOURce PHASe
To select the desired phase, use:
TRIGger:SYNC:PHASe 90
which specifies the 90 degree phase angle of the internal phase reference as the point where the
transient begins.
To turn off transient phase synchronization, use:
TRIGger: SYNC:SOURce IMMediate
When IMMediate is selected, the trigger system goes directly to the Output state. This is the parameter
selected at *RST.
6.5.4 Generating Triggers
Providing that you have specified the appropriate trigger source, you can generate triggers as follows:
To Next Page
Loading...
