52
DSOX4USBSQ USB 2.0 Signal Quality Analysis Application Electrical Testing Notes
3
Host Signal Quality Testing
See Also
•
Chapter 6
, “Saving Test Results to an HTML File,” starting on page 81
Host Low Speed Connection
Perform these connection steps:
1
Use the passive probes included with the oscilloscope.
2
Attach the passive probes to the oscilloscope's Channel 3 and Channel 2
inputs.
3
Attach the SQiDD board to the root hub on the host under test.
4
Attach a low speed device to the same section of the SQiDD board. If
the section has a switch, it should be set to ON.
5
Connect the oscilloscope Channel 2 probe to D+ probe point on the
SQiDD board. Connect the oscilloscope Channel 3 probe to the D- probe
point on the SQiDD board.
6
Exit the HS Electrical Test Tool if you have previously launched it.
1
2
3
4
SQiDD
Root Hub
Low Speed
Test Device (Mouse)
Direct Connect
SQiDD Cable
Host Under Test
Probe D+ and D- in
Host Under Test Path
D-
D+
