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Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual
B-15
Return-to-Zero (RZ) Measurements - Amplitude
Table B--4 describes each RZ measurement in the amplitude category. See Table
on B--5 on page B--29 for timing category measurements; see Table B--6 on page
B--36 for area category measurements.
Table B- 4: RZ Measurements - Amplitude
Name Definition
RZ AC RMS The root mean square amplitude, minus the DC component, of the waveform that is sampled
within t he measurem ent regi on.
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 automat ically set the measurement system to use a waveform database if available.
See Use a Waveform Database on page B--70.
For best result s with t his measurement:
H Perform a Dark Level compensati on before taki ng this m easurement 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.
RZ Amplitude The difference between the logi cal 1 level (High) and the l ogical 0 level (Low) of the RZ si gnal.
Both High and Low levels are measured wi thin the Eye Aperture.
RZ Amplitude = High – Low
Where High and Low are the logical 1 and 0 levels.
The Eye Aperture is adj ustable 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).
This measurement requires the use of a waveform database. When this measurement is turned
on, it will automat ically set the measurement system to use a waveform database if available.
For best result s with t his measurement:
H Perform a Dark Level compensati on before taki ng this m easurement 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.