Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 66)

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ISSUED: June 2013 923133 Rev A
PMIDL PIT MIDDLE LEVEL
Description
Pit Middle Level provides a measurement of the middle voltage level of pits or spaces. It is
performed by first calculating the midpoint of the average value of the base (pbase) for spaces
and the average value of the top of pits (ptop). If only 3T pits are specified, the resulting
measurement is the ‘decision level’ (see ISO/IEC 10149:1995 (E) Section 12.1). If a range of ‘nT’
values is selected and is displayed as a parameter, the measurement provides the weighted
average midpoint based on the number of occurrences of each ‘nT’ pit/space width. The
measurement value can be used to determine not only the differences of the midpoint of different
‘nT’ width pits, but also the overall best data waveform voltage threshold setting to use for all
ORMs.
Display Options
ORM parameter calculations can be displayed, histogrammed, and trended in a variety of ways.
DISPLAY TYPE VALUE DISPLAYED
Parameter Statistics Off
Single value of the middle level for all pits/spaces of interest for
last acquisition.
Parameter Statistics On
Overall average, minimum, maximum, and sigma of the single
middle level value calculated per acquisition, for all acquisitions
since the last C
LEAR S WEEPS operation.
nT Table
List of the middle level values for each group of pits/spaces of
common ‘nT’ width for the last acquisition.
Histogram Function
Histogram of the single middle level value calculated for each
acquisition for all acquisitions since the last C
LEAR S WEEPS
operation.
Trend Function
Trend of the single middle level value calculated for each
acquisition for all acquisitions since the last C
LEAR S WEEPS
operation.