Agilent Technologies N5416A Wartungshandbuch PDF herunterladen (Seite 74)

74 Notes on USB Electrical Compliance Testing

4 Hub 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 green Power

LED is lit, and yellow test LED is off.

2 Connect the [TEST PORT] of the test fixture into the upstream facing

port of the hub under test, using the 4" USB cable.

3 Connect the [INIT PORT] of the test fixture to a hi- speed port of the

Test Bed Computer. Apply power to the hub.

4 Attach the Agilent 113xA differential probe to D+/D- of TP2 on the test

fixture, using the 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+ on the fixture.

5 If you are using the new fixture, please terminate the SMA connectors

with 50 Ohm terminators.

6 Check I have completed these instructions.

Connecting the Equipment - Single-Ended Connection.

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

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Agilent Technologies N5416A Wartungshandbuch Seite 74