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Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
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Figure 46 Using the scope's automatic Search & Navigation capability to find all
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
column of the lister table. Your scope should have found and marked 4 or
5 occurrences of this search operation based on a total acquisition time of
2 seconds. Note that the number of "found" events is indicated near the
bottom of the display. To automatically navigate to each parity bit error,
press the
Let's now set up the scope to trigger exclusively on parity errors. But
because these errors occur so infrequently, we will need to change the
trigger mode from Auto to Normal to prevent auto triggering.
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2000 X-Series Oscilloscopes Advanced Training Guide
Push the horizontal position/delay knob to re- position the trigger point
back to center- screen.
Set the scope's timebase to 200.0 ms/div.
Press the [Search] front panel key.
Press the Search Edge softkey; then select Serial 1 (UART/RS232).
Press the Search for softkey; then select Rx or Tx Parity Error using the
Entry knob.
occurrences of parity bit errors over a 2 second time span.
46. These frames are also marked in orange in the first/pointer
and
front panel navigation keys.
Push the horizontal position/delay knob to re- position the trigger point
back to center- screen.
Set the scope's timebase to 1.00 ms/div.
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