Tektronix CSA8000B - Manual (Page 279)

Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual B- 17
Table B- 4: RZ Measurements - Amplitude (cont.)
Name Definition
RZ Extinction Ratio The ratio of the average power levels of the logic 1 level (High) to the logic 0 level (Low) of an
optical RZ signal. All level determinations are made within the RZ Eye Aperture.
Where High and Low are the logical 1 and 0 levels. See RZ Eye Aperture Parameters
on B--62.
The Eye Aperture is adjustable and defaults to 5% of the RZ pulse width.
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.
For best measurement results:
H Always 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 To Optimize the
Vertical Resolution on page B--69.
RZ ExtRatio
=
High
Low
RZ Extinction Ratio (%) The ratio of the average power levels of the logic 0 level (Low) to the logic 1 level (High) of an
optical RZ signal, expressed as a percentage. All level determinations are made within the RZ
Eye Aperture.
Where High and Low are the logical 1 and 0 levels.
The Eye Aperture is adjustable and defaults to 5% of the RZ pulse width.
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 measurement results:
H Always 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 To Optimize the
Vertical Resolution on page B--69.
RZ ExtRatio [%]
= 100 ×
Ꮛ
Low
High
Ꮠ