Multilevel triggering system used for outputting complicated trigger signals

The invention relates to a multilevel triggering system used for outputting complicated trigger signals. The multilevel triggering system of a signal analyzing instrument outputs the complicated trigger signals. The triggering system comprises a trigger control buffer used for receiving and buffering input signals, trigger function modules and a trigger matrix. Each trigger function module carries out a corresponding trigger function so as to detect a corresponding trigger condition. The trigger matrix comprises a plurality of trigger levels, each trigger level can be configured to comprise at least one trigger box, and each trigger box can be configured to achieve one of the trigger function modules. When each trigger box detects the trigger condition of the corresponding trigger function module in the buffered input signals, a corresponding box trigger is generated. When at least one trigger box in each trigger level generates the corresponding box trigger, the corresponding level trigger is generated. When the trigger levels generate the corresponding level trigger, the trigger matrix generates the complicated trigger signals.