Anritsu BERTWave MP2100B, Руководство по эксплуатации, Страница: 48 / 382

Chapter 1 Outline
1-18
Sampling Oscilloscope
The sampling oscilloscope is a function for monitoring the waveform of
the input signal. It requires a clock input sampling and the waveform is
drawn out of the clock timing. For a periodic signal like PRBS, the
waveform data is obtained by slightly varying the sampling timing. This
waveform data is drawn by superimposing the waveforms.
Clock timing
First measurement
waveform
Second measurement
waveform
Third measurement
waveform
Fourth measurement
waveform
Superimposed waveform
Figure 1.5-6 Drawing Method of Sampling Oscilloscope
Jitter
Jitter is the variation in the time of the crossover point between the Eye
Diagram rising and falling parts of the waveform.
Jitter p-p (Jitter p-p): Full width of histogram in time direction
Jitter RMS (Jitter RMS): Standard deviation of histogram in time
direction
Jitter RMS
Jitter p-p
Figure 1.5-7 Jitter p-p and Jitter RMS