Agilent Technologies N5416A Manual de Serviço descarregar pdf (Página 108)

108 Notes on USB Electrical Compliance Testing

4 Hub Hi-Speed Tests

2 Connect the E2649- 66402 (E2645- 66508 if you are using the old fixture)

Host Hi- Speed Signal Quality test fixture between the downstream port

under test of the hub and a known- good hi- speed device.

a Attach the differential probe to D+/D- of TP2 on the fixture. Ensure

the + polarity on the probe lines up with the D+ on the fixture.

b Connect the test fixture's [TEST PORT] to the hub downstream port

under test, using the 4" USB cable.

c Connect the test fixture's [INIT PORT] to the known good device

using the 1 meter USB cable.

d Apply power to the hub and the known good device.

3 Check I have completed these instructions.

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Agilent Technologies N5416A Manual de Serviço Página 108