Teledyne LeCroy JTA2 - Manual (Page 21)

JTA2-OM-E Rev A ISSUED: December 2003
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A setup mini-dialog opens to the right of the main dialog, offering the following additional setup
options:
Function Options How It Works
Ptrace Mean Clear Sweeps For each vertical time slice on
the persistence map, Ptrace
Mean calculates and plots a
trace corresponding to the
map’s mean value. Single-shot
signals sampled at or above 2
GS/s and accumulated in the
persistence map can be traced
at a resolution of 10 ps (100
GS/s equivalent sampling). The
persistence trace average can
be further analyzed using the
instrument’s standard
parameters, such as rise time.
Ptrace Range Clear Sweeps, % population
range. A percentage of the
population of the persistence
map can be chosen from which
the envelope will be formed,
enabling exclusion of infrequent
events (artifacts). For each vertical time slice on
the persistence map, Ptrace
Range calculates and plots an
envelope corresponding to the
map’s range. The range can
then be used in further
processing: for example, as a
source for Pass/Fail masks.
Ptrace Sigma Clear Sweeps, Scale to
standard deviations. This allows
you to select a sigma from 0.5
to 10.0, which expands those
parts of the sigma envelope
representing waveform regions
with the most jitter. This is
useful for making a tolerance
mask. For each vertical time slice on
the persistence map, Ptrace
Sigma calculates and plots an
envelope corresponding to the
map’s standard deviation.
Multiples of sigma can also be
done using sigma.
The sigma can be used in
further processing; for example,
as a source for Pass/Fail
masks.