Agilent Technologies DSOX4USBSQ USB 2.0 Manual de Serviço descarregar pdf (Página 61)

Hub Upstream Signal Quality Testing 4

DSOX4USBSQ USB 2.0 Signal Quality Analysis Application Electrical Testing Notes 61

When full speed tests are run on a 2- channel oscilloscope, a

statement about the analysis data being under- sampled will be

included in the test results.

c Press the Adj D+ Source softkey and select the analog input source

channel connected to the adjacent D+ signal

7 Press the Auto Setup softkey to automatically set up the oscilloscope for

the selected test.

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.

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 Serviço Página 61