OWON Oscilloscope Use in Automotive Sensor Testing
As automotive electronics become more common, sensor testing has become an important part of vehicle maintenance. One example described by OWON is the use of a PC virtual oscilloscope to test a magnetoelectric crankshaft position sensor. The goal is not only to view a signal, but also to help technicians understand whether engine behavior looks normal through waveform analysis.
In the described workflow, a notebook computer is prepared together with an OWON VDS2064 digital oscilloscope. After installing the PC software and connecting the wire, the crankshaft position sensor can be tested on the computer screen. This setup is presented as a practical way to inspect signal details in a more convenient and portable form.
What the Crankshaft Position Sensor Signal Can Show
The magnetoelectric crankshaft position sensor can generate its own signal without an additional power supply. When the metal wheel rotates, the magnetic field changes and the voltage in the circuit changes as well. Because of this, the oscilloscope waveform becomes a useful reference for observing sensor behavior.
According to the source, the signal amplitude is not fixed. As engine speed increases, the amplitude also increases. The waveform can also reflect the four stages of engine operation: intake, compression, work, and exhaust. For that reason, measuring the crankshaft sensor waveform can help indicate whether mechanical operation is normal.
Examples of Waveform-Based Diagnosis
One example in the source describes a Weichai WP7 Zoomlion crane engine after overhaul. At first, the engine could not be accelerated to 1900 rpm. Later, the highest speed was only 1500 rpm, and the waveform measured by the OWON VDS2064 virtual oscilloscope showed a larger amplitude difference than before.
After checking the signal panel and related movement, the issue was linked to abnormal crankshaft movement. The source describes forward-and-back or up-and-down movement and notes that the crankshaft had been “holding the Bush,” which caused excessive upper and lower runout. In this case, waveform observation helped point technicians toward a mechanical problem.
The article also notes that an oscilloscope can sometimes be used to indirectly judge misfire conditions. If one cylinder does not work when it should, crankshaft speed can drop at that moment. That change may appear in the waveform of the crankshaft position sensor, giving maintenance personnel another diagnostic clue.
Pay Attention to Sensor Terminal Connection
The source also emphasizes that the two terminals of a magnetoelectric crankshaft position sensor are not interchangeable for the ECU. If the connection is reversed, the normal and abnormal waveforms may differ by what is described as “half a tooth.” This can create timing errors or cause the ECU to judge timing as incorrect.
A second example given in the source is a Great Wall pickup Fengjun 6 country 5 model. The oscilloscope is used to compare the normal waveform with the waveform after the terminal is connected in reverse. This comparison shows why correct wiring matters when reading sensor signals.
Why a PC Virtual Oscilloscope Is Useful
OWON presents the VDS Series PC oscilloscope as a tool that combines portability with measurement capability. For automotive maintenance engineers, this matters because field work often requires equipment that is small, easy to carry, and still practical for signal analysis.
The source lists several features of the VDS series, including up to 100MHz bandwidth, up to 1GS/s real-time sample rate, 10M record length, FFT and X-Y display options, multi-trigger choices such as edge, video, slope, pulse, and alternate, USB isolation, USB bus powering, optional LAN remote control, and an ultra-thin body design.
These features are presented as helpful for technicians who need clearer waveform observation while working on automotive sensors. The computer screen makes waveform details easier to see, which can support analysis during maintenance work.
Summary
In the source material, OWON’s PC virtual oscilloscope is shown as a practical aid for automotive crankshaft sensor testing. It is used to observe waveform changes, compare normal and abnormal signals, and support diagnosis of engine and sensor-related issues. For maintenance personnel, the main value lies in combining portability, clear waveform display, and analysis-friendly PC-based operation.
For automotive diagnostic tasks where waveform detail matters, the OWON VDS2064 and the VDS Series are positioned as convenient tools for observing sensor signals and understanding mechanical behavior more clearly.
