Reference Full Speed Downstream Host Equipment Setup
NOTE. Make sure the acquired signal is a valid wavefor m.
If the signal is clipped, follow these steps to increase the vertical scale:
1. In the oscilloscope menu, select Vertical>Vertical Setup to display the Channel screen.
2. In the Scale fi eld, increas e the vertical scale values until the waveform is completely displayed on
screen.
Full Speed Downstream Host Equipment Setup
To set up the equipment for Full Speed Downstream (host) test, follow these steps:
1. Set the S6 switch to the Init position.
2. Connect the A receptacle from Device SQ test section (marked DUT) of the test fixture to the hub
system. Connect the Full Speed test device to Hub 5.
3. Connect Ch1 of the D+ probe to the D+ pins on the Device SQ section of the test fixture.
4. Connect Ch2 of the D– probe to the D– pins on the Device SQ section of the test fixture.
5. Use the standard USB cable to connect the Device SQ section of test fixture to the test port of the
unit under test (host).
TDSUSB2 Universal Serial Bus Measurements Package 193
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