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Appendix B: Automatic Measurements Reference
B-46
CSA8000B & TDS8000B User Manual
Table B- 7: NRZ Measurements - Amplitude (cont.)
Name Definition
NRZ Optical Modulation
Amplitude
An approximation defined as the difference of the logical power 1 and 0 determined in a vertical
slice through the eye crossing. The levels are determined as the means of the histograms of the
vertical dat a slice t hrough the High (logical 1) and Low (logical 0) levels.
NRZ OMA [watts] = P1 − P0
Where:
H P1 and P0 are t he average power level s of t he l ogical 1 and 0, determined at the eye
crossing.
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 a
waveform database is not available, no valid measurement results will be produced. See Use a
Waveform Database on page B--70.
NRZ Peak-to-Peak The difference between the Max and Min vertical values of the selected waveform within the
measurement region. See Defining and displaying waveforms on page 3--56.
NRZ Peak-to-Peak = Max – Min
Where Max and Mi n are the maximum and minimum measurements.
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.