Teledyne LeCroy SDA II - Manual (Page 33)

Operator's Manual
Show PLLTrack - Plots the jitter that the PLL is tracking out. This is relative to a ideal clock at the found bit
rate. PLLTrack waveform shows the behavior of the PLL to track out low frequency jitter in your signal. It
shows a waveform that includes, for each edge (real or virtual) in your signal, a measurement of the dif-
ference between (1) the expected arrival time of the edge, as determined by the PLL, and (2) the expected
arrival time of the edge if the PLL was not turned on.
Show TIETrack - Plots the TIETrack.
Jitter Spectrum
Touching the Jitter Spectrum button on the Jitter Measurement dialog displays the Jitter Spectrum
right-hand dialog.
Show RjBUjSpectrum - Checking this box displays the Rj BUj Spectrum. This plot displays the frequency
spectrum of the signal with the DDj removed.
Show Peak Threshold - Checking this box displays the threshold for the RjBUjSpectrum. Peaks higher
than this threshold are considered Pj and the remaining signal under the threshold is integrated to form
the Rj of the spectral method of jitter composition.
Show PjInv.FFT - Checking this box displays the Pj Inverse FFT. This plot is the inverse FFT of only the
points of the RjBUjSpectrum above the threshold. This allows you to view the peaks in the time domain
and is very useful for viewing time domain Pj effects.
Find Scale for Spectrum - Clicking this button automatically finds the optimal scale for viewing the RjBUj-
Spectrum.
Spect. Scale - Choose whether to view the RjBUjSpectrum on a linear or logarithmic scale.
Show Peaks - Checking this box displays the peaks of the RjBUjSpectrum. This annotates the points of
the RjBUjSpectrum above the threshold.
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