Agilent 33120A User's Guide

Chapter 4 Remote Interface ReferenceTriggeringTriggeringSee also “Triggering,” starting on page 98 in chapter 3.First-timeSCPI users,see page 211.Applies only to burst modulation and frequency sweep. You can issuetriggers for bursts and sweeps using an immediate trigger, an externaltrigger, or a bus trigger.TRIGger:SOURce {IMMediate|EXTernal|BUS}Select the source from which the function generator will accept atrigger. The function generator will accept an immediate internaltrigger, a hardware trigger from the rear-panel Ext Trig terminal,or a software (bus) trigger. The default is Immediate.[ Stored in volatile memory ]œ When the Immediate (internal) source is selected, the functiongenerator outputs continuously when the burst mode or sweep modeis enabled. The APPLy command automatically sets the trigger sourceto IMMediate.œ When the External source is selected, the function generator willaccept a hardware trigger applied to the rear-panel Ext Trig terminal.The function generator outputs one burst or initiates one sweep eachtime each time Ext Trig receives the rising edge of a TTL pulse.The Trig annunciator turns on when the function generator is waitingfor an external trigger.œ When the Bus (software) source is selected, the function generatoroutputs one burst or initiates one sweep each time a bus triggercommand is received. To trigger the function generator from theremote interface (GPIB or RS-232), send the *TRG (trigger) command.You can also trigger the function generator from the GPIB interface bysending the IEEE-488 Group Execute Trigger (GET) message(e.g., TRIGGER 710).186