Teledyne LeCroy JTA2 - Manual (Page 16)

JTA2 Option
14
ISSUED: December 2003 JTA2-OM-E Rev A
WHEN TO USE PERSISTENCE HISTOGRAMS
The Persistence Histogram function builds a histogram from a persistence map to reveal the
features that are only visible when several acquisitions have been superimposed on one another.
In contrast to this, the histogram as statistical tool simply graphs waveform parameters such as
amplitude, frequency, or pulse width on an acquisition or series of acquisitions.
Both Histogram and Persistence Histogram bar charts are divided into intervals, or bins. While
each bin in the histogram bar chart contains a class of similar parameter values, the Persistence
Histogram analyzes both vertical and horizontal "slices" of the persistence map. Vertically, each
bin contains a class of similar amplitude levels; horizontally, each bin contains a class of similar
time values.
For a Histogram of Use
a crossover point in time or in amplitude on an
eye diagram Persistence Histogram (Vert. and Horiz. Slices)
cumulative jitter on an eye diagram Persistence Histogram (Horiz. Slice)
signal-to-noise ratio on an eye diagram Persistence Histogram (Vert. Slice)
the different interval widths present in a long
data stream Histogram (of Timing Parameter p@lv)
cumulative jitter on a long record of a clock
signal Histogram (of Timing Parameter tie@lv)
cycle-to-cycle jitter Histogram (of
∆
p@lv)