Anritsu BERTWave Series, Operation Manual, Page: 50 / 466

Chapter 1 Outline
1-24
DDJ vs Bit
The amount of jitter, which is measured for each bit whose pattern
changes, is displayed as a graph.
The time difference between the clock and the waveform at the cross point
level is measured and the result is plotted on the pattern location.
When the waveform time is slower than the clock, the value is positive,
and when the waveform is faster than the clock, the value is negative.
1 1 1 0 0 0 0 1 1 0 1 1 1 0 1
Cross Point
Measured jitter value Measured waveform Clock
Figure 1.5-5 DDJ vs Bit Measurement Method