Operation monitoring system

Claim 1

An operation monitoring system, comprising: means for providing a series of scan pulses of predetermined length and repetition rate including a series of one-shot multivibrators coupled to each other to be sequentially triggered to provide said scan pulses and timer means electrically connected to said multivibrators for controlling the repetition rate of said pulses; switch means in operative relationship with said scan pulse providing means for conducting said pulses and operative to be placed in a first or a second condition; bistable circuit means in operative relationship with said switch means for being placed in a first conductive condition when said switch means is in said first condition and for being placed in a second conductive condition when said switch means is in said second condition; means in operative relationship with said switch means for providing information to enable the determination of efficiency of said operation including a first counterdrive circuit and first counter means in circuit with said first counter drive circuit for counting the number of said scan pulses produced by said switch means when said switch means are in said first condition; event determining means in operative relationship with said bistable circuit means for registering the occurence of an event in said operation when said switch means changes from said first to second condition including a second counterdrive circuit and second counter means in circuit with said second counter-drive circuit for counting the number of times said bistable circuit means changes from said first conductive condition to said second conductive condition; and third counter means in operative relationship with said scan pulse providing means and with said first counter means for disabling said first counting means when a predetermined number of said scan pulses is received by said third counter means.