TJ Histogram

Meas. mode:
Jitter
Waveform type:
NRZ
PAM4
Time Graphs Toolbar

Total Jitter Histogram shows the combined Random Jitter (RJ), Periodic Jitter (PJ) and Data Dependent Jitter (DDJ) probability density functions that have been convolved together. It is the histogram of all of the measured jitter, both correlated and uncorrelated, combined in a single histogram. The graph's horizontal axis indicates negative (–) time for samples that occur earlier than expected and positive (+) time for samples that occur later than expected.

For a PAM waveform, on the graph repeatedly click the Cycle Eye button to cycle through the waveform eye on which the histogram is based. For NRZ waveforms, which only have one eye defined by two levels, there is no selection. To globally specify the PAM eye for all affected graphs:

  1. Click Measure > Configure Jitter Mode Measurements to open the dialog.
  2. In the dialog, select the Jitter Measurements tab.
  3. In the Show Graphs Based on field, select the desired eye.

The global setting effects all Time graphs except RJ/PJ and Aliased Jitter Spectrum.