LeCroy SDA, Operator'S Manual

Page: 346 / 397

SDA FUNCTION REFERENCE
There are several specialized math functions that appear in the SDA math menu. These functions
make up the building blocks of the SDA jitter and eye pattern measurements and are available
from the
Select Math Operator menu. The following table presents an overview.
AltNcycle Alternate N-cycle jitter plot - this function displays a plot
of the standard deviation of the jitter for all edges
spaced N UI apart for 1 < N < Nmax. Where Nmax can
be set up to 2M.
Htie to BER Extrapolates a histogram of time interval error
measurements to the desired bit error rate. This
function creates the bathtub and total jitter curves. Total
jitter, as well as the effective and MJSQ breakdowns,
use the output of this function.
Jitter filter Filter the trend of jitter values with the specified band-
pass filter. This function expects a trend of jitter values
as an input. It is further required that the measurements
be time-continuous, that is, there is one measurement
for each consecutive UI in the data signal.
Slice2Persist This function takes a waveform and divides it up into
sequences that are 1 UI long based on a separate
clock input. The output is a persistence map showing
the eye pattern.
346
SDA-OM-E Rev H