Teledyne LeCroy QPHY-USB - Manual (Page 21)

QPHY-USB Software Option
QPHY-USB Operator’s Manual Rev F
21
MATLAB
Effective with X-Stream version 4.3.1, the LeCroy USB2.0 test suite requires the installation of the MATLAB
Component Runtime even if there is a full installation of the MATLAB software already on the machine. The
MATLAB Component Runtime can be downloaded from:
UU
http://www.lecroy.com/goto/MatlabInstaller/
UU
Note: MATLAB scripts are used to perform signal quality and inrush tests. If the MATLAB Component Runtime is not properly installed on the
oscilloscope the tests requiring these scripts are disabled.
USB Test Wizard
The LeCroy USB test software (USB2) provides a test wizard which directs users through the compliance test
procedure for hosts, hubs, and devices. The USB Test Wizard is activated by selecting USB2 from the Analysis
menu of the oscilloscope:
The following wizard dialog page asks for Mode and Test control setup information, and then guides the user
through the test. The Mode refers to the type of product being tested: Host, Hub or Device. Tests must be
followed step by step. Following the instructions closely guarantees the correct operation of the test. Once a test
is selected from the Test field, the instruction resets to Step 1.
• Use the Next button to proceed to the next step.
• Use the Back button to return to the previous step.
•
Use the Reset button to start the selected test over again from Step 1.
In the Result File Name field, the directory in which the result file is stored can be changed by using the Browse
button. The default directory is D:\Applications\USB2\Results\.
A Probe selection must be made to perform certain tests. Select the measurement method in the Probe field
between Differential (to use a differential probe) and 2 Cables (to use 2 SMA cables). The 2 Cables method
should be used for measuring signal quality with the TF-USB-B fixture (please refer to the Deskewing topic of this
manual for more details). The Differential probe method is to support old fixtures that do not have SMA
connectors. Some tests do not offer a probe selection and must use a differential probe. For those tests which use
the Signal Quality sections of the test fixture with a differential probe the SMA connectors must be terminated.
Step 1 - Hooking up the USB device, host, and cables to the USB test fixture:
Figure 15. Device test High-Speed Upstream Near End Signal Quality