Agilent Technologies N5416A Manuel de service télécharger pdf (Page 186)

186 Notes on USB Electrical Compliance Testing

7 Low and Full Speed Tests

Connecting the Equipment (if you do not have the new E2649- 66405

Droop/Drop Test Fixture)

The USB automated test application will prompt you to perform these

connection steps:

1 For 54831B/D and 54832B/D oscilloscopes, use 1165A passive probes.

For the 5485XA, 80000 and 90000A Series oscilloscpes, use E2697A

high- impedance converter with 10:1 passive probes, or 1156A active

probes.

2 Connect 500mA load boards to all but the adjacent port on the host or

self- powered hub under test. Connect the SQiDD board to the hub/host

port under test prior to connecting the load board .

3 Attach the passive probes to the oscilloscope's Channel 1 and Channel 2

inputs.

4 Connect the Channel 1 probe to Vbus on the SQiDD board with the

probe's ground to GND on one of the 500mA load boards. This is the

port under test.

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Agilent Technologies N5416A Manuel de service Page 186