Tektronix CSA8000B - Manual (Page 309)

Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual B- 47
Table B- 7: NRZ Measurements - Amplitude (cont.)
Name Definition
NRZ Peak-to-Peak Noise The maximum range of the amplitude variance sampled within a fixed width vertical slice
located at the center of the Eye Aperture at the High or Low levels. See RZ Eye Aperture
Parameters on B--62.
PkPk noise = Highpp or PkPk noise = Lowpp
The Eye Aperture is adjustable and defaults to 20% of the NRZ bit time. The High or Low
selection for Noise At control in the Measurement Setup dialog instructs the measurement to be
performed on the logical 1 or 0 levels. See To Localize a Measurement on page 3--83.
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 Perform Autoset or otherwise optimize the vertical resolution before this measurement, i.e.
increase the overall vertical size of the waveform (but without producing off-screen
waveform points). See To Optimize the Vertical Resolution on page B--69.