In the R&S SMU, trigger signals are internally generated or externally supplied signalswhich start signal generation at a particular point in time.Signal generation can also take place without triggering, in which case the signal isthen generated in full after modulation is powered up. A trigger event either has noeffect on signal generation (menu setting "Trigger Mode Auto") or triggers a signalrestart (menu setting "Trigger Mode Retrigger").If signal generation is triggered, the signal is continuously generated after the first trigger.In the "Armed_Auto" mode, a further trigger event has no effect. In the"Armed_Retrig" mode, every additional trigger event triggers a restart of the signal. Inboth cases, triggering can be reset to the initial state ("armed"), i.e. signal generation isstopped and the instrument waits for the next trigger to start signal generation anew.The status of signal generation ("Running" or "Stopped") is displayed for all triggermodes in the corresponding trigger menu of the digital standard currently switched on.The signal generation status particularly with an external trigger can thus be checked.Internal and external trigger sources are available for triggering.