17. Eye Pattern Display (LV5300/LV5300A/LV7300-SER02)
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17.2 Jitter Display Description
• Measurement
In the jitter display mode, the jitter component is extracted from the input signal and
plotted on a time graph. The time (horizontal) axis can be displayed in different ways
depending on the data interval of the lines, fields, or frames, which are being transmitted in
the SDI signal.
• Automatic Measurement
Timing jitter (T.J) and jitter (JIT) are automatically measured and displayed on the jitter
display screen. The measurement range is 0.00 to 9.60 UI.
SMPTE defines two methods of measuring jitter. One method uses an eye pattern, and the
other method uses a phase demodulator.
The eye pattern method has disadvantages not only that measurements are difficult when
the eye is not open but that measurements are prone to errors because the distinction
between waveform distortion (such as noise and sags) and jitter is difficult.
In contrast, the phase demodulator method makes jitter measurements with small errors
possible even when the eye pattern is closed and even when the amount of jitter is 1 UI or
more.
The unit use the phase demodulator method.
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