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Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual
B-39
Table B- 7: NRZ Measurements - Amplitude (cont.)
Name Definition
NRZ Crossing % The height of eye crossing as a percentage of eye height measured in the Eye Aperture.
Where High and Low are the logi cal 1 and 0 levels, and EyeCross is the level at eye
crossing. See NRZ Eye-Aperture Parameters on page B--65.
The Eye Aperture is adj ustable and defaults to 20% of the NRZ bit time. See RZ Eye Aperture
Parameters on B--62.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2). See To Localize a Measurement on page 3--83.
This measurement requires the use of a waveform database. When this measurement is turned
on, it will automat ically 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 How to Optimize the
Vertical Resolution on page B--70.
NRZ Crossing % = 100 ×
(Eye Cross − Low)
(High − Low)
NRZ Crossing Level The mean signal level at the eye crossing.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2).
When this measurement is turned on, it will automatically set the measurement system to use a
waveform database if available.
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.