Technical data

Low and Full Speed Tests 7
Notes on USB Electrical Compliance Testing 209
Connecting the Equipment 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 Attach the passive probes to the oscilloscope's Channel 3 and Channel 2
inputs.
3 Attach the SQiDD board to the hub under test.
4 Attach the upstream port of the hub under test to the end of 4
self- powered hubs and a host system. Hub #1 has to be a full- speed
hub and hub #2 a Hi- speed hub. The other hubs can be either full
speed or hi- speed hubs.
5 Attach a full speed device to the same section of the SQiDD board. If
the section has a switch, it should be set to ON.
6 Connect the oscilloscope Channel 2 probe to D- probe point of the
device under test portion. Connect the oscilloscope channel Channel 3
probe to the D+ probe point of the device under test portion.
7 Exit the HS Electrical Test Tool if you have previously launched it.
NOTE
Placing a full speed and/or a high-speed device downstream of a full speed hub forces both
to operate in full speed mode.