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Application of OWON Tablet Oscilloscope in Volkswagen PASSAT B7 Car Maintenance (2)
- 2020/10/6 -

Use OWON tablet oscilloscope to measure CAN CONFORT waveform

The control units onto auto numbers a lot, the communication between these units works through CAN field-bus.

CAN field-bus gets 2 categories, CAN DRIVE and CAN CONFORT. Taking PASSAT B7 as example, the communication between its control units runs through these 2 CAN field-buses, besides CAN communication, the communication between its control units and sensor / actuator also been through LIN field-bus. 

Via previous article “Use OWON tablet oscilloscope to measure driving CAN waveform”, we bring the detailed introduction towards how to measure CAN DRIVE, and with this article, we’ll eye upon how to measure CAN CONFORT field-bus.

The following illustration shows the circuit diagram of PASSAT B7.


The measuring point set at the control unit of auto door from driver’s side:

The captured signal been observed onto the display of TAO3104A as follows:

The “sleep” status of CAN_L field-bus been measured/ displayed as:
Note: Better to pull out the ignition key upon the measurement done.

The analysis towards displayed waveform (captured signal) -

● When the voltage of CAN_H jumps to 3.9V from 0V, the average voltage reads 0.9V.

● When the voltage of CAN_L drops to 1.14V from 5V, the average voltage reads 4.1V.

● CAN_L possible to work by single-bus.

● When entering into “sleep” status, the voltage of CAN_H stays at 0V, and CAN_L at 11V.


  4-CH TAO3000 Series Tablet Oscilloscope

+ bandwidth up to 120MHz, max real-time sampling rate at 1GSa/s

+ vertical resolution hits 14-bit

+ record length 40M, waveform refreshing rate 75,000 wfms/s

+ low base noise, accurate small-signal capturing

+ miscellaneous triggering/decoding function available

+ SCPI and LabVIEW supported

+ 8’’ 800 x 600 pixels multi-point touch screen

+ multi-CI: USB host, USB device, LAN, and optional Wi-Fi

Tablet oscilloscope

TAO3000 series is equipped with 14-bit high-resolution hardware ADC, the precision is 64 times against other oscilloscope on market. You can observe the waveform details more clearly, and measure the changes of small voltage signals more accurately.

Low background noise allows the oscilloscope to have better small signal measurement capabilities. High storage allows the oscilloscope to acquire longer signals. A high refresh rate allows the oscilloscope to capture waveform details and exceptional events.

TAO3000 series handheld oscilloscopes support multiple trigger modes, including Edge, Video, Pulse, Slope, Runt, Windows, Timeout, I2C, SPI, RS232/UART, CAN, and Nth Edge. Serial bus coding available in I2C, SPI, RS232/UART, and CAN.

Support +, -, *, /, FFT, FFTrms, Intg, Diff, Sqrt, User Defined Function, digital filter (low pass, high pass, bandpass, band reject).

Built-in Wi-Fi module, the user can connect with TAO3000 through a mobile device, realize the same screen display and control, store and view waveform data through the app, share with friends, realize collaborative analysis, and successfully complete the work.


2-CH TAO3000 Series Tablet Oscilloscope

2-in-1: DSO + multimeter

Built-in 4½ digits multimeter, the multimeter interface shows on the same screen with the oscilloscope.

The data logging function of the multimeter can record data for a long time, and export to a CSV file.

Multiple operation methods, make the car maintenance test more convenient.

Handheld oscilloscope