Connect-Tek USB-16 Manual do Utilizador descarregar pdf (Página 12)

Host High Speed Electrical Test Procedure Revision 1.4

4.4 Host High-speed Signal Quality (EL_2, EL_3, EL_6, EL_7)

1. Attach the differential probe to J15 of the TDSUSBF test fixture, Host SQ segment. Ensure the

“+” symbol on probe lines up with D+ on fixture. Turn on the oscilloscope if not have already

done so. Allow about 20 minutes for warm up. Connect the short USB cable from the Host SQ

fixture segment to the host port under test.

2. Launch the TDSUSB software application on the Tektronix oscilloscope by selecting with a

mouse or touch screen.

3. Press the Default setup button on the oscilloscope front panel.

4. In the applications menu bar select, File> Recall Default Setup.

5. In the Measurement select menu of the USB2.0 compliance test application, select the High

Speed tab.

6. Within the Signal Quality area of the application, select the High Speed Signal Quality tests>

Eye Diagram, Signal Rate, Rise time, Fall Time, and EOP Width.

Note: The Monotonic property test is available but not required as it may generate false

failures due to slight variations in the signal edge due to high frequency noise and/or

oscilloscope quantization error.

Figure 2: Tektronix TDSUSB Software

7. Enter a device ID (for example, TIDxxxxxxx USNE.tsv) in the device ID dialog box and a

device description into the device description dialog box.

8. Press Configure to configure TDSUSB according to the system under test.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 43 44

Sem comentários

Connect-Tek USB-16 Manual do Utilizador Página 12