140
4000 X-Series Oscilloscopes Advanced Training Guide
4
Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
7
Press
[Serial]
on the front panel of the scope.
8
In the
Mode
menu, select
ARINC 429
.
9
In the Signals menu, set
High Threshold
to
+1.0 V
and
Low Threshold
to
-1.0 V
.
These determine how high or low a signal needs to go to qualify for logic levels.
In a true ARINC 429 signal, the signal voltages are set to +10 V, but for this
example signal, they are only +2.5 V. ARINC 429 protocol suggests a range of
3-6 V. Set your thresholds on true signals accordingly.
You should now see ARINC 429 serial information being actively decoded on the
bottom of the waveform. Keysight's hardware based decoding allows for extremely
fast update and decode rates, allowing you to read the information as it passes
along the screen. Next, let's set up a trigger point, as we are still triggering on
random rising edges.
10
Press
[Trigger]
on the front panel, and in the
Trigger Type
menu, select
Serial 1:
ARINC 429
.
11
There are many different options in the
Trigger
menu for you to choose from; for
this example, select
Word Start
. This will trigger on all legal words. You should
now have a stable trigger, as in
Figure 94
Random edge triggering on ARINC-429 traffic.
Содержание 4000 X-Series
Страница 12: ...12 4000 X Series Oscilloscopes Advanced Training Guide 1 Getting Started...
Страница 156: ...156 4000 X Series Oscilloscopes Advanced Training Guide A Oscilloscope Block Diagram and Theory of Operation...
Страница 166: ...166 4000 X Series Oscilloscopes Advanced Training Guide B Oscilloscope Bandwidth Tutorial...
Страница 168: ...168 4000 X Series Oscilloscopes Advanced Training Guide C Related Keysight Literature...
