Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual
B- 37
Non-Return-to-Zero (NRZ) Measurements - Amplitude
Table B--7 topic describes each NRZ measurement in the amplitude category. See
Table B--8 on page B--50 for timing category measurements.; see Table B--9 on
page B--55 for area category measurements.
Table B- 7: NRZ Measurements - Amplitude
Name
Definition
NRZ AC RMS
The root mean square amplitude, minus the DC component, of the selected waveform within
the measurement 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 Measurement
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 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 Amplitude
The difference between the logical 1 level (High) and the logical 0 level (Low) of the NRZ signal.
Both High and Low levels are measured within the Eye Aperture.
NRZ Amplitude = High – Low
Where High and Low are the logical 1 and 0 levels.
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).
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.
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.
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