Description

Overview:

Classic Instruments Speed Signal Interface

Speed Signal Interface (Converts VSS/ECM speed signals to either 8k or 16k PPM)

The SN74Z has the following features when used as a Speedometer interface.Input Source OptionsThree wire pulse signal generator input sourceBuilt-in Vehicle Speed Sensor (VSS) input sourceMost Tremec transmissionsLater model 700R4’s Typically a sine wave signalTwo wire pulse signal generator input sourceClassic Instruments SN96 or SN95Typically a sine wave signalOne wire ECM signals input sourceTypically a 5 volt square waveOutputThe output can be selectable between either 8000 pulse per mile or 16000 pulse per mileOutputs a 12V square wave, 50% duty cycle8000 pulse per mile cruise control outputAdditional BenefitsThree different calibration optionsInstant: drive 30 MPH and press the calibration buttonReal-Time: press and the hold the calibration button to match the speedometer reading to the actual vehicle speedMarked Mile: Drive a measured mile to calibrate the speedometerInput signal can range from 2000-200,000 pulses per mileState of the art signal averaging software that ensures smooth pointer operation, even in fluctuating signal conditions.Noise-reducing, filtered power output for powered speedometer signal generators The SN74Z has the following features when used as a Tachometer interface.Input Source OptionsHigh Voltage Coil signal input source.5-6 pulses per revolution (1-12 cylinder engine)Typically the negative side of an ignition coil5-12V Square Wave signal input source.5-6 pulses per revolution (1-12 cylinder engine)20%-50% duty cycleTypically from an electronic ignition box or computerInductive Gear tooth sensor input sourceTypically used in diesel applications where there is not an ignition systemThe sensor can be mounted to the engine near the flywheel to sense the gear teeth as they rotate byCan be used with 32-510 tooth flywheels, 32-510 pulses per revolutionOutputSignal output12V square wave, 50% duty cycle2, 3, or 4 pulses per revolution (4, 6, or 8 cylinder)3 preset flywheel tooth settings148 tooth – Chevy Duramax152 tooth – 5.9L Cummins155 tooth – 7.3L Ford Powerstroke

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