Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual
B- 45
Table B- 7: NRZ Measurements - Amplitude (cont.)
Name
Definition
NRZ +Overshoot
The ratio of the maximum value of the measured signal to its amplitude, expressed as a
percentage. The waveform is scanned for the maximum value within the measurement region,
while the amplitude is measured in the Eye Aperture.
Where Max is the signal maximum, and High and Low are the logical 1 and 0 levels. 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.
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
+
Overshoot
=
100
×
(
Max
−
High
)
(
High
−
Low
)
NRZ - Overshoot
The ratio of the minimum value of the measured signal to its amplitude, expressed as a
percentage. The waveform is scanned for the minimum value within the measurement region,
while the amplitude is measured in the Eye Aperture.
Where Min is the signal minimum, and High and Low are the logical 1 and 0 levels.
The Eye Aperture is adjustable and defaults to 20% of the NRZ bit time.
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.
NRZ
−
Overshoot
=
100
×
(
Low
−
Min
)
(
High
−
Low
)
Содержание CSA8000B Series
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Страница 18: ...Preface xiv CSA8000B TDS8000B User Manual ...
Страница 26: ...Check the Package Contents 1 8 CSA8000B TDS8000B User Manual ...
Страница 62: ...Accessories and Options 1 44 CSA8000B TDS8000B User Manual ...
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 ...
Страница 186: ...Creating Math Waveforms 3 112 CSA8000B TDS8000B User Manual ...
Страница 214: ...Data Input and Output 3 140 CSA8000B TDS8000B User Manual ...
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