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| Capturing a bunch of CAN-frames, where one might be missing - (SDS800X) |
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| nctnico:
Keep in mind that most DSOs need a minimum oversampling rate. If the CAN rate is reasonably high, 5Ms/s may not allow decoding of the data. The first step is to determine the minimum samplerate at which the CAN messages are decoded reliably. Emphasis on reliably; I've seen DSOs attempt to decode but fail in a subtile way without warning; you end up with data which is garbage. |
| Martin72:
Yepp, can confirm this behaviour, it makes sense too. @eTobey: --- Quote ---The horizontal axis. --- End quote --- The way you might think it is not possible at first, which makes sense. The number of frames is limited to 2000, which can be seen clearly at 2s/div, and even more clearly at 5s/div. What you can do, however, is zoom in and scroll the section back and forth accordingly. |
| eTobey:
--- Quote from: Martin72 on March 24, 2024, 10:10:53 pm ---What you can do, however, is zoom in and scroll the section back and forth accordingly. --- End quote --- I did not say zoom... Take the first picture, and then move the trigger/scroll, so that decode frames will drop of to the left. |
| electronics hobbyist:
Your question is difficult to understand. You should take two comparison pictures instead of letting others try to understand your meaning."scroll" should be a horizontal position or trigger delay. |
| bobxyz:
The MCP2515 is a very common hobbyist CAN-to-SPI chip. If you can program and are familiar with the Arduino environment, you could use a $20 CAN+Processor board, e.g. https://www.adafruit.com/product/5724, to decode the CAN stream live and generate a trigger for your oscilloscope. This would let you zoom in on the analog waveforms. |
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