Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual
B- 27
Table B- 4: RZ Measurements - Amplitude (cont.)
Name
Definition
RZ Suppression Ratio
(%)
The inverse ratio of the average power level of the logic High to the Suppressed level measured
between two consecutive RZ pulses, with the result expressed in percentage. The RZ pulse is
sampled within the Eye Aperture where the High is determined as the mean of the histogram of
the data distribution in the upper half of the pulse. The same region is sampled to record the
data distribution in the lower half of the pulse, data corresponding to the logical level 0.
Similarly, data is sampled in an equivalent sized region placed at one-half bit interval offset from
the Eye Aperture. The mean of the histogram of the data distribution between the peaks
adjusted by subtracting the zero level histogram yields the Suppressed level.
Where:
H
High and Low are the logical 1 and 0 levels
H
Suppress is the mean of the histogram of the data within an Eye Aperture in the
suppressed region
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). The region used for sampling the suppressed region is equal to
the Eye Aperture and has no independent control. 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 measurement results:
H
Perform a Dark Level compensation before taking this measurement. 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 Suppression Ratio
[%]
=
100
×
Ꮛ
(
Suppress
−
Low
)
High
Ꮠ
Содержание CSA8000B Series
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Страница 76: ...Overview 3 2 CSA8000B TDS8000B User Manual ...
Страница 112: ...Acquiring Waveforms 3 38 CSA8000B TDS8000B User Manual ...
Страница 126: ...Triggering 3 52 CSA8000B TDS8000B User Manual ...
Страница 146: ...Displaying Waveforms 3 72 CSA8000B TDS8000B User Manual ...
Страница 174: ...Measuring Waveforms 3 100 CSA8000B TDS8000B User Manual ...
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