Ford VSS Signal Waveforms: Buffered Digital vs Unbuffered Analog Oscilloscope

This document is a two-panel oscilloscope reference illustration comparing two types of vehicle speed sensor (VSS) signal waveforms. The top panel, labeled "TYPICAL BUFFERED DIGITAL SIGNAL," shows a clean square wave displayed on an oscilloscope with settings of 50ms per division, A-B:1V, and 1.00V. This represents a digital signal that has been processed (buffered) into distinct high/low voltage levels. The bottom panel, labeled "TYPICAL UNBUFFERED ANALOG SIGNAL," shows a continuous sine wave oscillating between approximately +10V and -10V around a 0V centerline, representing the raw AC output of a sensor before any buffering or signal conditioning. A reader can learn to visually distinguish a buffered (square-wave, digital) signal from an unbuffered (sine-wave, analog AC) signal when scoping a speed sensor circuit, useful for diagnosing whether a VSS or its buffer circuitry is producing the expected waveform. The document contains no vehicle-specific text, part numbers, wire colors, or year/model applicability; it is a generic waveform comparison chart. It was uploaded in an album alongside E4OD transmission documents for a 1990 Ford Bronco.