Agilent Technologies 4000 X Manuel de service télécharger pdf (Page 133)

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

4000 X-Series Oscilloscopes Advanced Training Guide 133

12 Press the [Serial] front key.

13 Tap the Mode softkey; then select the USB serial decode mode.

14 Tap the Speed softkey and select Low.

15 Tap the Signals softkey and verity that D+ Source is defined as

channel- 1, and that D- Source is defined as channel- 2 (default

conditions). Set each Threshold levels to ~1.4 V if not set already.

16 Press the (Back) front panel button (above power switch) to return

to the previous menu.

Your scope should now be decoding USB traffic as shown in Figure 90. We

can see automatic decoding of this USB bus via the blue trace at the

bottom of the display, which shows time- aligned decoding of the serial bus

traffic.

Figure 89 Random edge triggering on USB traffic.

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Agilent Technologies 4000 X Manuel de service Page 133