Advanced RF Triggering Application Module, Sequence, Pulse Width, Runt, Timeout, and Logic Triggers on RF Input for MDO4000 Series The Tektronix MDO4TRIG is an application module and provides advanced RF triggering. It enables the RF input power level to be used as a source for sequence, pulse width, timeout, runt, and logic trigger types. For example, you can trigger on a RF pulse of a specific length or use the RF channel as an input to a logic trigger, enabling the oscilloscope to trigger only when the RF is on while other signals are active.