Agilent Technologies N5416A Manual de Serviço descarregar pdf (Página 176)

176 Notes on USB Electrical Compliance Testing

6 Troubleshooting Hi-Speed Test Failures

• Mask Template — If you choose to use the SDA software option to

perform data eye tests, you need to select the appropriate mask

template to use for the eye diagram.

• MATLAB scripts version — Allows you to select between MATLAB

scripts version 2.10 or 2.12.

• Threshold — Allows you to select or enter the voltage level to use when

measuring SYNC field or EOP widths. Noisy signals may have ripples at

the end of the EOP; therefore, a higher level should be chosen to avoid

the ripples.

• Trigger Level — Allows you to select or enter the voltage level to use

when triggering on the inter- packet gaps. Noisy signals may have low

amplitudes; therefore, the trigger level should be reduced.

• Inrush Current Time Range — Allows you to select the total time range

to capture inrush current.

• Inrush Current Trigger Level — Allows you to select the trigger level to

use to capture inrush current. Self- powered devices may draw very

little current, so the trigger level should be reduced.

Also useful for debugging problems is the EZJIT analysis software option

for the oscilloscope.

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Agilent Technologies N5416A Manual de Serviço Página 176