Tektronix CSA8000B Instrukcja Użytkownika Pobierz pdf (Strona 317)

Appendix B: Automatic Measurements Reference

CSA8000B & TDS8000B User Manual

B-55

Non-Return-to-Zero (NRZ) Measurements - Area

Table B--9 topic describes each NRZ measurement in the area category. See

Table B--7 on page B--37 for amplitude category measurements.; see Table B--8

on page B--50 for timing category measurements.

Table B- 9: NRZ Measurements - Area

Name Definition

NRZ Area The area under the curve for the NRZ waveform within the measurement region. Area

measured above ground is positive; area measured below ground is negative.

over the m easurement region.

If enabled, measurement gates constrain the measurement region to the area between the Start

Gate (G1) and Stop Gate (G2). See To Localize a M easurem ent on page 3--83.

When this measurement is turned on, it will automatically set the measurement system to use a

waveform database if available. See Use a Waveform Database on page B--70.

For best result s with t his measurement:

H Perform a Dark Level compensati on before taki ng this m easurement if the source of the

measured waveform is an optical channel. See To Perform Dark-Level and User

Wavelength Gain Compensations on page 3--98.

H Optimize the vertical resolution before taking this measurement. See To Optimize the

Vertical Resolution on page B--69.

NRZ Area =

ጺ

waveform(t) dt,

NRZ Cycle Area The area under the curve f or the first NRZ bit time within the measurement region. Area

measured above ground is positive; area measured below ground is negative.

over the first NRZ bit within the measurement region.

When this measurement is turned on, it will automatically set the measurement system to use a

waveform database if available.