92
4000 X-Series Oscilloscopes Advanced Training Guide
4
Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
Your scope should have found and marked approximately 20 occurrences of this
search operation based on a total acquisition time of 200 ms. Note that the
number of “found” events is indicated near the bottom of the display. To
automatically navigate to each MOSI byte = 03
HEX
, press the
and
front
panel navigation keys.
Let’s now use the scope’s Segmented Memory mode of acquisition to capture 500
consecutive occurrences of SPI serial bus traffic when MOSI = 03
HEX
. But to
complete the rest of this lab your scope must be licensed with the Segmented
Memory option.
44
Push the horizontal position/delay knob to re-position the trigger point back to
center-screen.
45
Set the scope’s timebase to
200.0 µs/div
.
46
Press the
[Run/Stop]
front panel to begin repetitive acquisition again.
47
Press the
[Acquire]
front panel key.
48
Tap the
Segmented
softkey; then tap
# of Segs
and enter
500
as the number of
segments to capture.
49
Tap the
Segmented
softkey to begin a Segmented Memory acquisition.
50
Tap the
Current Segment
softkey; then turn the Entry knob to review all 500
captured segments.
51
Set the
Current Segment
to
500
and note the time-tag of the last captured
segment.
