Tektronix CSA8000B - Manual (Page 282)

Appendix B: Automatic Measurements Reference
B- 20 CSA8000B & TDS8000B User Manual
Table B- 4: RZ Measurements - Amplitude (cont.)
Name Definition
RZ High The logical 1 level of the RZ signal. The data within the Eye Aperture is sampled, a histogram is
built from the upper half of the RZ eye, and the mean of the histogram yields the High level.
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 Low The logical 0 level of the RZ signal. The data within the Eye Aperture is sampled, a histogram is
built from the lower half of the RZ eye, and the mean of the histogram yields the Low level.
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 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.