Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 62)

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ISSUED: June 2013 923133 Rev A
PBASE PIT BASE
Description
Pit Base provides a best estimate of the bottom amplitude of a space. The concept of the base
calculation is to automatically provide the same measurement that would be obtained from a persistence
plot. The base of each space is determined through histogramming techniques described under Base
and Top Calculation Details.
When pbase is configured as a custom parameter, all bases within the single nT or range of nT are
calculated. Histogramming or trending such a configuration would result in one value per space in the
nT range contributing a value to the histogram or trend. The value displayed on the custom parameter
display line is the average of all such base calculations. ‘nT Table’ mode provides an average base
measurement for each n index.
Display Options
ORM parameter calculations can be displayed, histogrammed, and trended in a variety of ways.
The following table provides a concise description of the value or values displayed using each
approach.
DISPLAY TYPE VALUE DISPLAYED
Parameter Statistics Off
All values of the base for all spaces within the selected ‘nT’
range for the last acquisition.
Parameter Statistics On
Average, minimum, maximum, and sigma of the base for all
spaces that are within the selected ‘nT’ range for all acquisitions
since the last C
LEAR S WEEPS operation.
nT Table
List of values of the average base for each group of spaces of
common ‘nT’ width for the last acquisition.
Histogram Function
Histogram graph of the value of the base for all spaces within
the selected ‘nT’ range for all acquisitions since the last C
LEAR
S WEEPS operation.
Trend Function
Trend graph of the value of the base calculated for space that is
within the selected ‘nT’ range for all acquisitions since the last
C
LEAR S WEEPS operation.