Measurement setups Select a communications measurement
Extinction Ratio D ecibel
Extinction ratio decibel is the ratio ofeyetoptobaseexpressedindecibels.
This measurement is only valid when the acquisition mode is set to WfmDB, FastAcq is enabled, or
the measurement is ta ken on a referenc e waveform saved in FastAcq mode.
ExtdB = 10 × Log(pTopMean/pBaseMean)
Eye Height
Eye height is the measurement of the eye height in volts.
Eye Height
= (pTopMean-3 × pTopSigma) - (pBaseMean + 3 × pBaseSigma)
Eye Width
Eye width is the meas urement of eye width in seconds.
Eye Width = (tCross2Mean-3 × pTopSigma) - (tCross1Mean + *tCross1Sigma)
Crossing Perce nt
Crossing percent measurement is the eye crossing point expressed as a percentage of eye height.
Crossing Percent = 100 × [(pCross1Mean - pBaseMean)/(pTopMean - pBaseMean)]
Eye Top
Eye Top is the top value used in the extinction ratio measurements.
Eye
Top = pTopMean
Ey
e Base
Eye Base is the base value u sed in the extinction ratio measurements.
Eye Base = pBaseMean
Jitter Peak-to-Peak
Jitter p-p is the peak-to-peak value for the edge jitter in the current horizontal units.
Jitter PP = TCross1PP
280 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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