Engine scope tester calibrator

An engine simulator comprising:

• a. means for selecting the number of cylinders in the simulated engine;
• b. means for selecting the speed of revolution of the simulated engine;
• c. pulse rate logic means connected to said cylinder selecting means and said speed selecting means for determining the rate of total spark plug firings in an engine of the selected number of cylinders revolving at the selected speed;
• d. pulse generation means connected to said pulse rate logic means for generating a series of first pulses equal to the rate of total spark plug firings determined by said pulse rate logic means and a series of second pulses equal to the rate of firing of a single spark plug in the engine;
• e. driver means connected to said pulse generation means and responsive to said first pulses;
• f. means connected to said driver means for producing a first high voltage pulse in response to each of said first pulses;
• and,
• g. means connected to said pulse generation means and being responsive to said second pulses for producing a second high voltage pulse in response to each of said second pulses.

An engine simulator comprising:

• a. an oscillator and counter producing a series of pulses occurring at a basic rate equal to the rate of total spark plug firings in an eight cylinder engine revolving at the maximum number of RPM's to be simulated;
• b. a decode gate connected to said oscillator and counter, said decode gate having four outputs, the first of said outputs being said pulses at said basic rate, the second, third and fourth of said outputs being pulses at three-fourths, one-half, and one-fourth of said basic rate respectively;
• c. first switch means adapted to be selectively connected by an operator to one of said outputs of said decode gate at a time;
• d. means connected to said first switch means for rescaling the rate of said pulses as a function of engine RPM to be simulated, said rescaling means having an input, an output and means for an operator to select the desired engine RPM;
• e. a counter connected to said output of said rescaling means, said counter having first, second, third and fourth outputs being pulses at one-eighth, input rate to said counter, the second of said outputs being one-sixth, one-fourth and one-half the input rate to said counter respectively;
• f. second switch means connected to said outputs of said counter, said second switch means being adapted to move in positional synchronization with said first switch means and selectively connect to one of said output of said counter at a time;
• g. means connected to said first switch means for producing a first high voltage pulse in response to each of said pulses received from said first switch means;
• and,
• h. means connected to said second switch means for producing a second high voltage pulse in response to each of said pulses received from said second switch means.