Agilent Technologies DSOX4USBSQ USB 2.0 Manual de Serviço descarregar pdf (Página 20)

20 DSOX4USBSQ USB 2.0 Signal Quality Analysis Application Electrical Testing Notes

2 Device Signal Quality Testing

Device Hi-Speed Signal Quality Test

To set up and run the Device Hi- Speed signal quality tests:

1 Connect the USB Device, test fixtures, and equipment:

• If you are probing the test fixture using a differential probe, see

"Device Hi-Speed Connection - Differential Probe" on page 24.

• If you are probing the test fixture using SMA cables, see "Device

Hi- Speed Connection - SMA Cables" on page 25.

2 Set up the test signal/packet that will be analyzed.

To set up the test packets used for compliance testing, see "Device

Hi- Speed Compliance Test Packets" on page 26.

3 On the Device Hi- Speed Signal Quality test fixture, place the TEST

switch (S1) in the ON position.

Verify the yellow TEST LED is lit.

4 On the oscilloscope's front panel, press the [Analyze] key.

5 In the Analyze Menu, press the Features softkey; then, select USB Signal

Quality.

6 Press the Te st softkey and select the Device Hi-Speed Signal Quality test.

Table 3 Equipment Used in Device Hi-Speed Signal Quality Tests

Quantity Item Description/Model

1 Oscilloscope Agilent 4000 X-Series 1.5 GHz bandwidth

model

1 Oscilloscope probing solution:

• Differential probe Agilent 113xA with E2678A or E2669A

• SMA cables Agilent 15443A matched cable pair or

equivalent

1 Host test bed computer Any computer with the Windows XP,

Windows 7, or Windows 8 operating system

and hi-speed USB ports.

1 Device Hi-Speed Signal Quality

test fixture and 4" USB cable

Agilent E2649-66401

1 5V power supply Agilent 0950-2546 or equivalent

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 85 86

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Agilent Technologies DSOX4USBSQ USB 2.0 Manual de Serviço Página 20