Technical data

32 DSOX4USBSQ USB 2.0 Signal Quality Analysis Application Electrical Testing Notes
2 Device Signal Quality Testing
3 In the Device Test dialog box, click Enumerate Bus once.
All devices attached to the host controller should appear in the device
enumeration list.
If you do not know which VID/PID belongs to the device under test,
detach the device under test and enumerate the bus once. Then
reattach the device under test and enumerate again, this time paying
attention to the new device attached.
4 Highlight the device under test and select LOOP DEVICE DESCRIPTOR from
the Device Command drop down menu.
5 Click EXECUTE once.