Application Examples Typical Equipment Setup-Chirp
1. Set the S6 switch to the Init position.
2. Use a standard length of the USB cable with an AplugononeendandaBplugontheotherend.
3. Connect one end of the cable to the B receptacle socket connector on the Init port of Device SQ
section and the other end to the host port A socket.
4. Connect the A receptacle from the Device SQ test port to the unit under test (device).
5. Connect the single-ended probes of the oscilloscope to the D+ and D– pins.
6. Select the measurement and select the
button to run the application.
7. Run the HS Electrical Test Tool on the connected host. Enumerate the unit under test (device) and
observe the chirp signal on the oscilloscope. Rather than enumerating the device, an alternative method
to generate the chirp signal is to disconnect and reconnect the unit under test (device) to the port.
8. Select OK after acquiring a waveform. Verify that it is a correct waveform.
NOTE. To avoid false triggering for the chirp signals while operating the test fixture, it is recommended
that you pla
ce the switch in the Init position and connect the unit under test. This disables the switch
bounce to the trigger.
TDSUSB2 Universal Serial Bus Measurements Package 119
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