# Jitter/Noise Analysis Limitations

- RJ/DJ analysis is limited to clock-type waveforms and periodic data-type waveforms.

- A waveform that has more than ±1 UI (unit interval) of jitter generates an error message and the measurement is not made. RJ/DJ measurements require the waveform being analyzed to have some eye pattern opening.

- Pattern length and waveform record length limitations of RJ/DJ analysis are described in Jitter Analysis Record Length Requirements.