Technical data

Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs 4
4000 X-Series Oscilloscopes Advanced Training Guide 99
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.
35 Push the horizontal position/delay knob to re- position the trigger point
back to center-screen.
36 Set the scope’s timebase to 1.00 ms/div.
37 Press the [Run/Stop] front panel to begin repetitive acquisitions again.
38 Press the [Trigger] front panel key; then tap the Trigger Setup softkey.
39 Tap the Trigger Tx Data softkey; then select Rx or Tx Parity Error.
40 Press the [Mode/Coupling] front panel key near the trigger level knob.
41 Tap the Mode Auto softkey; then select Normal. The parity error is
infrequent, so the scope will auto trigger on an asynchronous interval
unless we force the normal mode of triggering.
42 Set the horizontal position/delay to approximately -4.7 ms.
We now have the scope triggering exclusively on parity errors (note that
“31” is displayed in red) as shown in Figure 64. Let’s now use the scope’s
Segmented Memory acquisition to capture 50 consecutive occurrences of
Figure 64 Triggering on Parity Errors.