Agilent Technologies N5416A Manuale di Servizio Pagina 43

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Device Hi-Speed Tests 3
Notes on USB Electrical Compliance Testing 43
Running the Tests
1 Click Run Tests.
Test Instructions, Part 1
The USB automated test application will prompt you to perform these
steps:
1 Cycle the device power to restore the device to normal operation. On
the Device Test Menu of the HS Electrical Tool, click Enumerate Bus
once.
2 Using the oscilloscope, verify the SOFs (Start Of Frame) packets are
being transmitted on the port under test. You may need to lower the
trigger level to somewhat below 400 mV.
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