Agilent Technologies DisplayPort Instrukcja Użytkownika Pobierz pdf (Strona 28)

Test Details: Screen Shots and Discussion

October 29, 2012

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Pre Emphasis Tests

Notes:

1. The nominal settings of Level 0, 1, 2, 3 are 0, 3.5, 6, and 9.5 dB BUT we really don’t care

about the absolute level. What is important is the DIFFERENCE between settings.

2. We measure the Pre-Emphasis between adjacent pre-emphasis settings at a specific Level

setting and compare.

3. The non transition voltages are also checked: V

Nontran_low

Nontran_high

> 0.7

PE 0 to PE1 Resultant =

20*Log [(210/179)

/(135/192)]

= 4.45 dB

Non Transition Voltages=

179/192 = .93

Level Setting 0, PE setting 1

Level Setting 0, PE setting 0

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 42 43

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Agilent Technologies DisplayPort Instrukcja Użytkownika Strona 28