This front-panel connector is used in the following modes: ? Triggered Sweep Mode: To select the external source, press the Source Ext softkey When the rising or falling edge (you specify which edge) of a TTL pulse is received on the Sync/Mod/Trig connector, the function generator outputs a single sweep. ? Externally-Modulated FSK Mode: To enable the externally-modulated mode, press the Source softkey from the front-panel (FSK must be enabled). When a logic low level is present, the carrier frequency is output. When a logic high level is present, the hop frequency is output. The maximum external FSK rate is 100 kHz. ? Triggered Burst Mode: To select the external source, press the Source Ext softkey (burst must be enabled). The function generator outputs a waveform with a specified number of cycles (burst count) each time a trigger is received from the specified trigger source. ? External Gated Burst Mode: To enable the gated mode, press the Gated softkey (burst must be enabled). When the external gate signal is true, the function generator outputs a continuous waveform. When the external gate signal goes false, the current waveform cycle is completed and then the function generator stops while remaining at the voltage level corresponding to the starting burst phase. For noise, the output stops immediately when the gate signal goes false.
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