Technical data

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.
Back