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 logical 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 adjustable 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 automatically set the measurement system to use a waveform database if available.
See
Use a Waveform Database
on page B--70
For best results with this measurement:
H
Perform a Dark Level compensation before taking this measurement 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 results with this measurement:
H
Perform a Dark Level compensation before taking this measurement 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.
Содержание CSA8000B Series
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