10/08/2026
🔧 Throwback Thursday: The Evolution of Automotive Oscilloscopes
Long before we had modern scan tools and laptop-based oscilloscopes, technicians were already using scopes to diagnose vehicle problems.
By the 1960s, large engine analyzers from companies like Sun Electric and Marquette were being used to examine ignition waveforms. These machines were often the size of a refrigerator and allowed technicians to compare ignition patterns, identify misfires, and diagnose problems that couldn't be found with a basic meter.
As vehicle electronics became more advanced, oscilloscopes became even more useful.
In the 1990s, Snap-on helped bring electronic waveform testing into a more portable format. Tools like the original Vantage combined a graphing multimeter with vehicle-specific diagnostic information. Later, Snap-on's MODIS brought scan-tool functions, lab scope capabilities, and component testing together in one handheld diagnostic platform.
Around the same time, another company was taking a different approach.
Pico Technology was founded in 1991, initially developing PC-based oscilloscopes. In 1997, Pico introduced its first automotive oscilloscope, the ADC-101, followed by an automotive diagnostics kit in 2002.
Instead of building everything into a dedicated handheld tool, Pico used a computer to display, capture, and analyze waveforms. That approach helped pave the way for the powerful laptop-based diagnostic scopes we use today.
Now we're using oscilloscopes for far more than ignition systems. CAN and LIN communication, injector current ramps, crankshaft and camshaft correlation, pressure transducers, and intermittent electrical faults are just a few examples.
The equipment has changed dramatically, but the principle hasn't.
A scan tool tells you what the control module is reporting. An oscilloscope lets you see what is actually happening on the circuit.
Who remembers using the old Sun engine analyzers, Snap-on Vantage or MODIS, or the early PicoScopes?
What was the first oscilloscope you used in the shop, and what are you using today?