Agilent 33120A User's Guide

Chapter 4 Remote Interface ReferenceBurst Modulation CommandsBM:INTernal:RATE {|MINimum|MAXimum}Set the burst rate for internally triggered bursts. The burst ratefrequency defines the interval between bursts. Select from 10 mHz to50 kHz. The default is 100 Hz. MIN = 10 mHz. MAX = 50 kHz.[ Stored in volatile memory ]œ The burst rate setting is used only when internal triggering isenabled (triggered mode). The burst rate is ignored when singletriggering or external triggering is enabled.œ It is possible to specify a burst rate which is too fast for the functiongenerator to output with the specified carrier frequency and burstcount. If the burst rate is too high, the function generator willinternally adjust it as needed to continuously re-trigger the burst.The adjustment is handled internally by the function generator(the burst rate displayed or queried will be the same as specified).BM:INTernal:RATE? [MINimum|MAXimum]Query the burst rate. Returns a value in hertz.BM:SOURce {INTernal|EXTernal}Select the burst modulation source. In the external gated burst mode,the output waveform is either “on” or “off ” based on the level of theexternal signal applied to the rear-panel Ext Trig terminal. The defaultis INT. [ Stored in volatile memory ]œ When the internal burst source is selected, the external gated modeis disabled.œ When the external gate source is selected, the output is enabled ordisabled based on the logic level of the gate signal applied to theExt Trig terminal. When the gate signal is true (TTL high),the function generator outputs a continuous waveform. When thegate signal is false (TTL low), the output is turned off (zero volts orthe dc offset level).œ When the external gate source is selected, the burst count, burst rate,burst phase, and burst trigger source are ignored (these parametersare used for the triggered burst mode only).BM:SOURce?Query the present burst modulation source. Returns “INT” or “EXT”.164