Agilent Technologies 4000 X Instrukcja Obsługi Pobierz pdf (Strona 134)

134 4000 X-Series Oscilloscopes Advanced Training Guide

4 Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs

Note that your scope should still be triggering on random edge crossings of

channel- 1. Let's now set up the scope to a specific trigger point - when it

detects an IN token packet.

17 Press the [Trigger] front panel key; then select Serial 1 (USB).

18 Tap the Trigger on: softkey; then select Token Packet.

19 Tap the PID softkey, and select IN as the token we want to trigger on.

You should now see stable waveform traces on your scope's display similar

to Figure 91. Of course, there is still a bit of confusion as it is triggering

on multiple IN packets, which are rapidly flashing on the bottom of the

screen in the blue decode area. Let's zoom out and see the scope's ability

to list all decoded traffic, to discover a unique and stable trigger point.

Figure 90 Fast, hardware decoding of USB traffic.

1 2 ... 129 130 131 132 133 134 135 136 137 138 139 ... 167 168

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Agilent Technologies 4000 X Instrukcja Obsługi Strona 134