Agilent 33120A User's Guide

Chapter 3 Features and FunctionsTriggeringExt Trig / FSK / Burst Input Terminal5 VINPUT0 V> 1 msThis terminal is used in the following modes:œ Triggered Sweep Mode: Press Single or execute TRIG:SOUR EXTfrom the remote interface to enable the triggered sweep mode(sweeps must be enabled). When the rising edge of a TTL pulse isreceived on the Ext Trig terminal, the function generator outputs asingle sweep. The Trig annunciator turns on when the functiongenerator is waiting for a trigger.œ Externally-Modulated FSK Mode: To enable the externallymodulatedmode, select “FSK SRC EXT” from the front-panel MODMENU or execute FSK:SOUR EXT from the remote interface whenFSK is enabled. When a low TTL level is present, the FSK carrierfrequency is output. When a high TTL level is present, the FSK “hop”frequency is output. The Ext annunciator turns on when selected.œ Triggered Burst Mode: Press Single or execute TRIG:SOUR EXTfrom the remote interface to enable the triggered burst mode(burst must be enabled). When the rising edge of a TTL pulse isreceived, the function generator outputs a burst waveform with thespecified number of cycles. The Trig annunciator turns on when thefunction generator is waiting for a trigger.œ External Gated Burst Mode: To enable the external gated mode,select “BURST SRC EXT GATED” from the front-panel MOD MENUor execute BM:SOUR EXT from the remote interface when burst isenabled. When a high TTL level is present, the function generatoroutputs the carrier waveform. When a low TTL level is present, theoutput is disabled. The Ext annunciator turns on when selected.102