482 Keysight M8000 Series of BER Test Solutions User Guide
8 Working with Measurements
The following illustration shows a jitter curve where both RJ and DJ are
present. It also shows how the TJ peak-to-peak and RMS are calculated.
Estimated Total Jitter
The Estimated Total Jitter (TJ) allows you to predict the jitter expected for
very low bit error rates that would take a long time to measure. It is
obtained by extrapolating the measured BER curves.
The TJ is estimated by extending the BER curves (based on the points
detected between the BER Threshold and the Minimum BER for RJ/DJ
Separation) to the Residual BER for RJ/DJ Separation level. The estimated
TJ is the period minus the width of the measured eye.
1.00e+9
1.20e+10
1.10e+10
1.00e+10
9.00e+9
8.00e+9
7.00e+9
6.00e+9
5.00e+9
4.00e+9
3.00e+9
2.00e+9
2.80e+10
2.70e+10
2.60e+10
2.50e+10
2.40e+10
2.30e+10
2.20e+10
2.10e+10
2.00e+10
1.90e+10
1.80e+10
1.70e+10
1.60e+10
1.50e+10
1.40e+10
1.30e+10
1 Trace: 79 Points UI = 333.333ps AI Errors
Linear
Relative
TJ RMS
DJ
RJ RJ
TJ PkPk
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