Agilent 33120A User's Guide

Chapter 4 Remote Interface ReferenceBurst Modulation CommandsBM:STATe {OFF|ON}Disable or enable burst modulation. To ensure proper operation, youshould enable the burst mode after you have set up the other modulationparameters. Only one modulation mode can be enabled at a time. Whenyou enable the burst mode, the previous modulation mode is turned off.BM:STATe?Query the state of burst modulation. Returns “0” (OFF) or “1” (ON).TRIGger:SOURce {IMMediate|EXTernal|BUS}Select the burst “trigger” source. In the triggered burst mode, thefunction generator outputs a waveform with the specified number ofcycles (burst count) each time a trigger is received. After the specifiednumber of cycles has been output, the function generator waits for thenext trigger while outputting no signal (zero volts or the dc offset level).The default is IMM. [ Stored in volatile memory ]œ In the triggered burst mode, the “burst source” is Internal.œ When the Immediate (internal) trigger source is selected, thefrequency at which the burst is generated is determined by theburst rate (BM:INT:RATE). The APPLy command automatically setsthe trigger source to IMMediate.œ When the External trigger source is selected, the function generatorwill accept a hardware trigger applied to the rear-panel Ext Trigterminal. The function generator outputs the specified number ofcycles 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 each time a bus trigger command is received.To trigger the function generator from the remote interface (GPIB orRS-232), send the *TRG (trigger) command. You can also trigger thefunction generator from the GPIB interface by sending the IEEE-488Group Execute Trigger (GET) message (e.g., TRIGGER 710).œ When the External or Bus trigger source is selected, the burst countand burst phase remain in effect but the burst rate is ignored.4165