Appendix B: Automatic Measurements Reference
B- 24
CSA8000B & TDS8000B User Manual
Table B- 4: RZ Measurements - Amplitude (cont.)
Name
Definition
RZ Q Factor
A figure of merit of an eye diagram, reporting the ratio between the amplitude of the RZ pulse to
the total RMS noise on the High and Low levels. The RZ pulse is sampled within the Eye
Aperture, where the High and Low levels are determined as the mean of the histogram of the
data distribution in the upper and lower half of the pulse, respectively. The noise levels are
characterized by
σ
high and
σ
low, the standard deviations from the mean for the High and Low
levels.
Where:
H
High and Low are the logical 1 and 0 levels.
H
σ
high and
σ
low are the standard deviations.
The Eye Aperture is adjustable and defaults to 5% of the RZ pulse width. 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.
RZ Q Factor
=
(
High
−
Low
)
(
σ
high
+
σ
low
)
RZ RMS
The true root mean square of the waveform that is sampled within the measurement region.
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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Страница 112: ...Acquiring Waveforms 3 38 CSA8000B TDS8000B User Manual ...
Страница 126: ...Triggering 3 52 CSA8000B TDS8000B User Manual ...
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Страница 174: ...Measuring Waveforms 3 100 CSA8000B TDS8000B User Manual ...
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