User`s guide

Histogram Tool

Applications of Histogram Tool

• Displays information about the distribution of the measured events such as period, Rise time, Fall

time, Positive pulse width, and Negative pulse width.

• Displays a histogram of the samples taken during a single burst of measurements.

• Analysis of long-term signal integrity in a short test time. TailFit option separates the Gaussian and

deterministic components from the measured distribution. For a multi-modal distribution, Tailfit gives

accurate information about the effects of jitter on long term and short term signal integrity.

The Histogram tool provides the user with statistical analysis of time measurements of different clock

features such as Period, Rise time, Fall time, Positive Pulse Width, Negative Pulse Width. The time

measurements are asynchronously sampled at random intervals to give a solid, statistical set displayed

as an Histogram. The values of Mean, Maximum, Minimum, Peak-to-peak and 1-sigma are reported.

Proprietary software algorithms separate deterministic and random jitter components allowing the

calculation of total jitter. These values are used to create a Bathtub Curve to predict long-term reliability.