Technical data

36 Notes on USB Electrical Compliance Testing
3 Device Hi-Speed Tests
Configuring the Tests
Connecting the Equipment - Differential Connection
The USB automated test application will prompt you to perform these
connection steps:
1 Attach the 5V power supply to J5 of the E2649- 66401 (E2645- 66507 if
you are using the old fixture) Device Hi- Speed signal quality test
fixture. Leave the TEST switch at the OFF position. Verify the green
Power LED is lit and the yellow Test LED is not lit.
2 Connect the [TEST PORT] of the Device Hi- speed Signal Quality test
fixture into the upstream facing port of the device under test, using the
4" USB cable.
3 Connect the [INIT PORT] of the test fixture to a Hi- speed capable port
of the Test Bed Computer, using a USB cable.
4 Apply power to the device.
5 Attach the differential probe to D+/D- of TP2 on the test fixture, using
the damped header adapter (the header adapter is only needed if you
are using the old test fixture). Ensure the + polarity on the probe lines
up with D+.
6 If you are using the new fixture, please terminate the SMA connectors
with 50 Ohm terminators.
7 Check I have completed these instructions.