Teledyne LeCroy WaveExpert 100H Operators Manual - Manual (Page 96)

Operator’s Manual
94
WE-OM-E Rev A
Saturation Level
The Persistence display is generated by repeated sampling of the amplitudes of events over time,
and the accumulation of the sampled data into "3-dimensional" display maps. These maps create
an analog-style display. User-definable persistence duration can be used to view how the maps
evolve proportionally over time. Statistical integrity is preserved because the duration (decay) is
proportional to the persistence population for each amplitude or time combination in the data. In
addition, the instrument gives you post-acquisition saturation control for a more detailed display.
When you select mode from the Persistence dialog (with All Locked selected), each
channel is assigned a single color. As a persistence data map develops, different intensities of that
color are assigned to the range between a minimum and a maximum population. The maximum
population automatically gets the highest intensity, the minimum population gets the lowest
intensity, and intermediate populations get intensities in between these extremes.
The information in the lower populations (for example, down at the noise level) could be of greater
interest to you than the rest. The Analog persistence view highlights the distribution of data so that
you can examine it in detail.
You can select a saturation level as a percentage of the maximum population. All populations
above the saturation population are then assigned the highest color intensity: that is, they are
saturated. At the same time, all populations below the saturation level are assigned the remaining
intensities. Data populations are dynamically updated as data from new acquisitions is
accumulated.
Color mode persistence, selected by touching , works on the same principle as the Analog
persistence feature, but instead uses the entire color spectrum to map signal intensity: violet for
minimum population, red for maximum population. A saturation level of 100% spreads the intensity
variation across the entire distribution; at lower saturation levels the intensity will saturate (become
the brightest color) at the percentage value specified. Lowering this percentage causes the pixels
to be saturated at a lower population, and makes visible those rarely hit pixels not seen at higher
percentages.
3-Dimensional Persistence
By selecting 3d , you can create a topographical view of your waveform from a selection of
shadings, textures, and hues. The advantage of the topographical view is that areas of highest and
lowest intensity are shown as peaks and valleys, in addition to color or brightness. The shape of the
peaks (pointed or flat) can reveal further information about the frequency of occurrences in your
waveform.