Agilent Technologies DSOX4USBSQ USB 2.0 Manual de servicio descargar pdf (Pagina 51)

Host Signal Quality Testing 3

DSOX4USBSQ USB 2.0 Signal Quality Analysis Application Electrical Testing Notes 51

For optimal test results, you can make adjustments to the auto setup.

Generally, you want one packet of data, plus the time of one bit on

each end, across the oscilloscope's display. Also, vertical scale and

offset should be adjusted so that the signals take six vertical divisions

without being clipped.

You should see the transmitted test packet on the oscilloscope as below.

8 Press the Run Test softkey to run the selected signal quality test.

When tests are run, the oscilloscope stops acquisitions if they are

running, analyzes the data on screen, and then displays the results.

When the test completes, the results are automatically displayed. You

can press the Display Results softkey to disable or reenable the test

results display.

The analyzed acquisition remains on screen and can be viewed by

moving or dismissing the results dialog box.

You can run tests when the oscilloscope is already stopped. This is

useful in the case of embedded hosts (and other cases) where the

device under test (DUT) may not easily be placed in a test mode, and

you want to analyze already acquired data.

NOTE

Tests can take several minutes to run and cannot be cancelled once started.

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Agilent Technologies DSOX4USBSQ USB 2.0 Manual de servicio Pagina 51