Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
4
4000 X-Series Oscilloscopes Advanced Training Guide
145
7
Press
[Serial]
on the front panel of the scope.
8
In the
Mode
menu, select
MIL-STD-1553
.
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 MIL-STD-1553 signal, the signal voltages are set b9 V and
+14 V, but for this example signal, they are only +2.5 V. MIL-STD-1553 protocol
suggests a range of 3-6 V. Set your thresholds on true signals accordingly.
You should now see MIL-STD-1553 serial information being actively decoded on
the bottom of the waveform, as in
. 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.
Figure 98
Random edge triggering on MIL-STD-1553 traffic.
