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Appendix B: Automatic Measurements Reference
B-42
CSA8000B & TDS8000B User Manual
Table B- 7: NRZ Measurements - Amplitude (cont.)
Name Definition
NRZ Gain The amplit ude gain between t wo wavef orm s. The measurement returns the ratio between the
amplitudes measured wit hin the Eye Aperture of each of the waveforms.
Where Ampl1 and Ampl2 are the amplitudes of the two source waveforms. See NRZ
Amplitude on page B--37.
The Eye Aperture is adj ustable 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 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 How to Optimize the
Vertical Resolution on page B--70.
NRZ Gain =
Ampl2
Ampl1
NRZ High The logical 1 of the NRZ signal . The data within the Eye Aperture is sampled, a histogram is
built from the upper half of the NRZ eye, and the mean of the histogram yields the High level.
The Eye Aperture is adj ustable 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 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.