Tektronix TDSUSB2, Руководство пользователя

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Application Examples
Packet Parameter Measurement
Specifying the Equipment-Packet Parameter Measurement
The following equipment is needed for a Packet Parameter measurement:
Tektronix digital oscilloscope
TDSUSB2 application
TDSUSBF compliance test fixture
One P6248 differential probe
Host Controller (Host controller card with the test mode software on a
Microsoft Windows PC)
Typical Equipment Setup-Packet Parameter Measurement
Test Fixture Setup
To set up the test fixture, follow these steps:
1. Set the S6 switch to the Init position.
2. Connect the standard USB cable between the Device SQ Init port and the
host port.
3. Connect the A receptacle (marked DUT) from the Device SQ test port to the
device under test.
4. Apply the power to the test fixture.
5. Apply the power to the DUT.
6. Attach the differential probe near the device connector on the test fixture.
Set up the Oscilloscope for High Speed Host
1. Select the measurement and run the application. The application
automatically sets the oscilloscope parameters (Horizontal, Vertical, and
Trigger) and displays the message, "Press OK when correct waveform is
acquired”. You can see the SOFs on the oscilloscope screen.
2. If you are not able to acquire the waveform automatically, perform
Autosetup in the oscilloscope to display the SOF.
3. If your DUT is EL_21, EL_23, EL_25, select the Single Step Set Feature
option from the HS electrical test tool.
TDSUSB2 Universal Serial Bus Measurement Package 101