Agilent 33120A User's Guide

Chapter 4 Remote Interface ReferenceBurst Modulation CommandsTRIGger:SOURce(continued)œ When the External gate source is selected (“gated” burst mode), thespecified trigger source is ignored. The external gated mode overridesthe triggered mode source.œ To ensure synchronization when the Bus source is selected, send the*WAI (wait) command. When the *WAI command is executed, thefunction generator waits for all pending operations to complete beforeexecuting any additional commands. For example, the followingcommand string guarantees that the first trigger is accepted andexecuted before the second trigger is recognized."TRIG:SOUR BUS;*TRG;*WAI;*TRG;*WAI"œ You can use the *OPC? (operation complete query) command or the*OPC (operation complete) command to signal when the burst iscomplete. The *OPC? command returns “1” to the output buffer whenthe burst is complete. The *OPC command sets the “operation complete”bit (bit 0) in the Standard Event register when the burst is complete.TRIGger:SOURce?Query the present trigger source. Returns “IMM”, “EXT”, or “BUS”.166