Agilent Technologies 4000 X Instrukcja Obsługi Pobierz pdf (Strona 145)

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 between +9 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 Figure 99. Agilent'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.

1 2 ... 140 141 142 143 144 145 146 147 148 149 150 ... 167 168

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Agilent Technologies 4000 X Instrukcja Obsługi Strona 145