Table of Contents
Advertisement
O
'
M
PERATOR
S
ANUAL
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.
mode from the Persistence dialog, each channel is assigned a single color. As a
When you select
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.
The instrument also gives you the ability to turn the X and Y axes of the waveform through 180° of rotation from -
90° to +90°.
73
WRXi-OM-E Rev C
Advertisement
Table of Contents
