System for reconfiguring oscilloscope screen in freeze mode

Engine analyzer apparatus for monitoring waveforms from an associated multi-cylinder internal combustion engine in which the cylinders are fired in a predetermined firing order, said apparatus comprising:

• waveform acquisition circuitry including signal pickup leads adapted to be coupled to an associated engine for respectively receiving different analog input signals including primary and secondary ignition signals therefrom and generating digitized waveform data representative of such analog signals,
• a memory for storing digitized waveform data together with information correlating stored waveform data with engine cylinders,
• a display device having a display screen for displaying stored waveform data from one or more input signals in a screen display format which includes one or more waveform representations on one or more traces with each trace having a selected engine sweep in the case of ignition waveforms, and
• a processor coupled to said waveform acquisition circuitry and to said memory and to said display device and operable under stored program control for controlling storage and display of waveform data,
• said processor executing a program which includes:
• (a) a mode control routine for selectively operating said display device in either a live mode in which acquired waveform data is displayed in a predetermined format substantially currently as acquired or a freeze mode in which a previously acquired waveform screen display is frozen on the screen in the predetermined format, said mode control routine including a portion cooperating with said memory to store for at least one trace selected display format parameters corresponding to waveform signals, if any, initially displayed on the at least one trace and another trace when the freeze mode is entered, and
• (b) a freeze control routine selectively operable in the freeze mode for reconfiguring a frozen screen display format by
• (1) altering the number of traces and/or the signal displayed on a trace, and/or
• (2) altering the engine sweep in the case of ignition signals.

Engine analyzer apparatus for monitoring waveforms from an associated multi-cylinder internal combustion engine in which the cylinders are fired in a predetermined firing order, said apparatus comprising:

• waveform acquisition circuitry including signal pickup leads adapted to be coupled to an associated engine for respectively receiving different analog input signals including primary and secondary ignition signals therefrom and generating digitized waveform data representative of such analog signals,
• a memory for storing digitized waveform data together with information correlating stored waveform data with engine cylinders,
• a display device having a display screen for displaying stored waveform data from one or more input signals in a screen display format having a selected engine sweep in the case of ignition waveforms, and
• a processor coupled to said waveform acquisition circuitry and to said memory and to said display device and operable under stored program control for controlling storage and display of waveform data,
• said processor executing a program which includes:
• (a) a mode control routine for selectively operating said display device in either a live mode in which acquired waveform data is displayed in a predetermined format substantially currently as acquired or a freeze mode in which a previously acquired waveform screen display is frozen on the screen in the predetermined format, and
• (b) a freeze control routine selectively operable in the freeze mode for reconfiguring a frozen screen display format by altering the engine sweep in the case of ignition signals.