Tektronix TDSUSB2, Руководство пользователя

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Measurement Algorithms
Receiver Sensitivity Test
You can test the Receiver sensitivity of a high speed device to respond to the
particular data pattern generated by the digital signal generator. Receiver
Sensitivity responds whenever the data pattern level of the voltage level is greater
than 150 mV and does not respond when the voltage level is equal to or less than
100 mV below the squelch level. The application provides the procedural steps to
this test.
For more details, refer to the procedural steps .
Chirp Test for a Device
This test examines the basic timing and voltages of both upstream and
downstream ports during the speed detection protocol. To get the Chirp signal,
hot-plug the unit under test (device) and measure the signaling with single-ended
probes on both lines. The application analyzes data for the following:
Reset duration
Chirp-K amplitude
Chirp-K duration
TDSUSB2 Universal Serial Bus Measurement Package 197