User guide

Table 24
Parameter Symbol Meaning
Mu
μ
Mean.
DUT Output Timing/Jitter
measurement:
The position of the marker
center on the time scale.
Output Levels
measurement:
The position of the marker
center on the vertical
threshold scale.
Sigma
σ
Standard deviation. The
RMS value of the marked
area.
Kappa
κ
Linear scaling factor.
A Gaussian marker is used when the jitter graph is displayed. It is most useful if
deterministic jitter is present. In this case, the jitter graph shows more than one
peak (see also “Estimated Total Jitter” on page 245).
The jitter values Mean, RMS, and Peak-Peak refer to the whole jitter. The Gaussian
marker allows to measure the normal distribution of individual jitter peaks. You can
thus determine how parts of the jitter histogram contribute to the overall jitter
values.
You may have measured a bathtub curve like the one shown below:
Advanced Analysis 6
Agilent J-BERT N4903B High-Performance Serial BERT 239
DUT Output Timing/Jitter
Measurement