Technical data

194 Notes on USB Electrical Compliance Testing
7 Low and Full Speed Tests
Connecting the Equipment (if you do not have the 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 100mA 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.