Application Examples Typical Equipment Setup-Low Speed Droop Tests
7. Connect the Load2 to the A receptacle of the Droop and Adjacent Trigger section on the test fixture.
Connect the A pin dongle from the Droop and Adjacent Trigger section to the Port4 of the unit under
test (hub). Po
rt4 is the port under test of the hub.
8. Connect the Load3 to Port3 of the unit under test (hub). Now all the ports of the unit under test
are connecte
d (hub).
9. Select the measurement and select the
command button to run the application.
10. Select OK when the valid waveform is acquired.
11. Observe the droop in the VBUS when Droop test load is applied.
NOTE. The application automatically sets up the oscilloscope to acquire the Droop signal. If you do not
get a valid signal, set up the oscilloscope accordingly.
NOTE. Use the Load Switch to select 500 mA test loads for Droop testing of a self powered hub and
system. Use the Load Switch to select 100 mA test loads for Droop testing of bus powered hub and system.
72 TDSUSB2 Universal Serial Bus Measurements Package
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