Technical data

A Using Trigger Holdoff to Synchronize Acquisitions/Display on Complex Signals
72 Agilent InfiniiVision 7000B Series Oscilloscopes Evaluation Guide
Notice that even though this signal crosses the trigger level setting at
approximately the 50% level, the waveform appears to be not triggered.
This is because the oscilloscope is randomly triggering on any edge
crossing of the carrier signal. To properly trigger on this complex signal,
we need to set up the oscilloscope to synchronize trigger arming and
disarming based on the modulating frequency. We can do this with
trigger “holdoff”.
9 Press the [Run/Stop] front panel to stop repetitive acquisitions.