LeCroy DDA 7 Zi series, Operator'S Manual

Page: 324 / 544

WavePro 7Zi
323
WP700Zi-OM-E-RevA
More About Timing Jitter
In order to understand the operation of the timing jitter parameter with different modes of operation, consider the
histogram of 3T to 5T pit widths in the next figure.
The Timing Jitter parameter considers each of these distributions separately. For each distribution the standard
deviation is calculated. This is the timing jitter displayed for each nT distribution. Overall timing jitter is calculated
by subtracting the mean width of each distribution from the widths in those distributions and considering the
resulting superposition.
The sigma of the 3T, 4T, and 5T distributions are what is obtained when the Timing Jitter custom parameter is
configured for single n values (the sigmas are the same as the sigma of the edge shift calculation). The sigma of
the resulting superposition is what is obtained when the Timing Jitter custom parameter is configured for ranges
of n values (in this case 3T to 5T).