Patent ID: 7191079

Claim:
An oscilloscope having advanced trigger circuitry, comprising: a control operated by a user to select one of a first plurality of continuous-time trigger events, and one of a second plurality of continuous-time trigger events; a first trigger decoder for triggering on an occurrence of said selected one of said first plurality of continuous-time trigger events and providing a first trigger signal; and a second trigger decoder for triggering on an occurrence of said selected one of said second plurality of continuous-time trigger events and providing a second trigger signal, said second trigger decoder being armed for triggering in response to said first trigger signal; a timer for timing a time period, a duration of said time period being programmable by a user, said timer beginning to time said time period in response to said first trigger signal, said timer generating an end-of-time signal at an expiration of said time period; and a reset circuit responsive to said end-of-time signal of said timer for resetting said first trigger decoder if said selected one of said second plurality of continuous-time trigger events failed to occur before said end-of-time signal was generated.