Keysight 4000 X-Series, Руководство по продвинутой подготовке

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114 4000 X-Series Oscilloscopes Advanced Training Guide
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Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
As you scroll through the data, note that waveforms “track”. This means that the
frame that the arrow points to in the lister table corresponds to the waveforms that
are positioned at center-screen. If you want to zoom in on a particular LIN frame of
data, tap the Zoom to Selection softkey. Looking for infrequent errors in this long
decoded record can be difficult. So let’s now perform an automatic search to find
all occurrences of errors. We will then automatically navigate to each of these
error conditions.
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Push the horizontal position/delay knob to re-position the trigger point back to
center-screen.
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Set the scope’s timebase to 200.0 ms/div .
23
Press the
[Search]
front panel key.
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Tap the Search Edge softkey; then select Serial 1 (LIN) .
25
Tap the Search for softkey; then select Errors .
The white triangles near the top of the waveform area mark the time location of
each “found” occurrence of our search operation as shown in Figure 76 . These
frames are also marked in orange in the first/pointer column of the lister table.
Your scope should have found and marked more than 15 occurrences of this
search operation based on a total acquisition time of 2 seconds. Note that the
Figure 76 Using the scope’s automatic Search & Navigation capability to find all occurrences
of LIN errors over a 2 second time span.