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5989-2000EN Datasheet(PDF) 8 Page - Agilent(Hewlett-Packard) |
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5989-2000EN Datasheet(HTML) 8 Page - Agilent(Hewlett-Packard) |
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8 / 13 page  7 Mixed-signal and serial bus applications (continued) While scrolling through the various segments/frames, we could see that error frames were occurring randomly. So the next step in this CAN measurement application was to capture and store only error frames. To do this, we set up the scope’s triggering to trigger specifically on any occurrence of any error frame, regardless of its ID code. Figure 5 shows how the segmented memory acquisition mode captured 500 consecutive error frames with a total capture time (time-tag of the segment #500) of more than 60 seconds. Capturing this many frames at this sample rate (~9 MSa/s) using conventional oscilloscope memory would require more than 0.5 Gigabyte of acquisition memory. But with the segmented memory option, our InfiniiVision oscilloscope was able to capture more than 60 seconds of selective signal detail using its 8 Megapoints of memory Once we have captured consecutive CAN error frames, we can easily dial through all of the individual frames to discover why these errors might be occurring. In this measurement example, we can see that segment #471 was an error frame with a data frame ID code of 07FHEX. After close inspection of the analog waveform associated with this decoded frame, we can now see why the error frame occurred. Note the narrow glitch near the end of this frame. Figure 5: Segmented memory captures 500 consecutive CAN frames over a 60-second time span. |
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