Independent cursor control in dual-trace engine analyzer scope

Engine analyzer apparatus for monitoring waveforms from an associated multi-cylinder internal combustion engine, said apparatus comprising:

• memory means for storing digitized waveform data,
• display means including a display screen for displaying stored waveform data as plural waveform representations respectively on different traces,
• processing means coupled to said memory means and to said display means and operating under stored program control for controlling storage and display of waveform data,
• said processing means including means for controlling the display screen to display thereon indicia including plural cursor arrays respectively displayed on the traces,
• said processing means including synchronizing means selectively operable between an activated condition wherein the movements of the cursor arrays are synchronized with one another and a deactivated condition wherein the cursor arrays are movable independently of one another, and
• switch means coupled to said processing means and selectively operable for activating and deactivating said synchronizing means.

Apparatus for monitoring waveforms comprising:

• memory means for storing digitized waveform data,
• display means including a display screen for displaying stored waveform data as plural waveform representations respectively on different traces, and
• processing means coupled to said memory means and to said display means and operating under stored program control for controlling storage and display of waveform data,
• said processing means including means for controlling the display screen to display thereon indicia including plural cursors respectively displayed on the traces,
• said processing means including cursor control means for controlling movement of the cursors independently of one another.