Agilent Technologies N5416A Manuel de service télécharger pdf (Page 195)

Low and Full Speed Tests 7

Notes on USB Electrical Compliance Testing 195

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

probe's ground to GND on one of the 100mA load boards. This is the

port under test.

5 Connect the Channel 2 probe to the Vbus test point on the load board

connected adjacent to the USB port to be measured. This provides the

oscilloscope trigger.

6 Check I have completed these instructions.

Running the Tests

1 Click Run Tests.

Test Instructions

The USB automated test application will prompt you to perform these

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 100 mA load boards to all but the adjacent port on the

bus- 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.

1 2 ... 190 191 192 193 194 195 196 197 198 199 200 ... 235 236

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Agilent Technologies N5416A Manuel de service Page 195