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Mixed-signal oscilloscopes

Handling extended CAN FD data frames

Yokogawa (Japan) has added additional trigger and analysis options to its DLM2000 (4-channel) and DLM4000 (8-channel) mixed-signal oscilloscopes. They are designed to address the challenges posed by CAN FD and SENT.

(Photo: Yokogawa)

WHEN EQUIPPED WITH THE SERIAL BUS OPTIONS, the mixed-signal oscilloscopes decode the bus signals and display the results in real time. A variety of dedicated triggers and search functions are available to aid analysis and troubleshooting on parameters that can affect the bus signals: something that is becoming increasingly important as the amount of traffic inside the CAN network grows with more sophisticated vehicle control systems.

The DLM series of oscilloscopes are suited to this type of analysis because of the versatility provided by their long memory: in particular, the length of the acquisition memory in the DLM4000 mixed-signal 8-channel oscilloscope is up to 250 Mpoints, making it a straightforward task to handle the extended data frames used in CAN FD that allow the bit-rate inside a frame to be changed flexibly. It also makes it possible to display trend data over extended periods: up to 100 seconds of data for SENT signals with microsecond duration, for example.

The DLM2000 is a 4-channel mixed-signal oscilloscope with bandwidths from 200 MHz to 500 MHz and memory up to 250 Mpoints. Channel four can be activated either as an analog input, or to acquire 8 bits of logic. The DLM4000 is an 8-channel MSO available in both 350 MHz and 500 MHz models, with 2,5 GS/s sampling. It features eight analog input channels, with the eighth input channel converting to an 8-bit logic analyzer at the push of a button. An additional 16 logic analyzer inputs are available as an option, for 24-bit logic analysis.

Yokogawa follows several other companies with its CAN FD oscilloscopes: Keysight Technologies' Infinii Vision 3000T X-Series and 4000T X-Series also support CAN FD; as do the RTE and RTO oscilloscopes from Rohde & Schwarz and the CAN FD TDM oscilloscopes from Teledyne LeCroy.

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