Sigma-n Per Level

Sigma-n Per Level is a measurement of noise on the flattest portion of consecutive symbols, for each symbol level, according to the selected standard.

Sigma-n is an averaged measurement of the RMS deviation from the mean voltage noise (σ) at all signal levels. It represents essentially the crosstalk and all other external noise.

The Sigma-n measurement computes the noise parameter, σ_n, for waveforms according to the selected technology standard. The parameter σ_n measures the uncorrelated RMS amplitude noise of each symbol level (including random noise and bounded uncorrelated noise effects), while not including ISI (inter-symbol interference) and jitter effects.

SCPI Command

:MEASure:SNDRatio:SNPLevel