Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 38)

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ISSUED: June 2013 923133 Rev A
The measurement has configurable units. If absolute time is specified, the value is simply the time
indicated above. If percent is specified, the value of the measurement is the time normalized to the
clock period:
For all pits, a valid measurement will be obtained only when both pit/space edges can be determined,
(that is, there is a hysteresis-qualified threshold crossing beginning and ending the pit/space pair of
interest between the parameter cursors)
, and there is a clock edge of both polarities surrounding the
leading pit or space edge between the parameter cursors.
Display Options
ORM parameter calculations can be displayed, histogrammed, and trended in a variety of ways.
DISPLAY TYPE VALUE DISPLAYED
Parameter Statistics Off
All values of the time between beginning edge of the subject n pit
(space) and nearest clock edges for all subject pits (spaces)
preceded by the spaces (pits) within the selected ‘nT’ range for
the last acquisition.
Parameter Statistics On
Average, minimum, maximum, and sigma of the beginning edge
shift calculated for all identified pit/space pairs within the selected
‘nT’ range for all acquisitions since the last C
LEAR S WEEPS
operation.
nT Table
List of values of the average beginning edge shift for each ‘nT’
space (pit) within the selected range preceding the subject pit
(space) for the last acquisition.
Histogram Function
Histogram graph of the value of the beginning edge shift
calculated for all pit/space pairs 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 beginning edge shift calculated for
all pit/space pairs within the selected ‘nT’ range for all acquisitions
since the last C
LEAR S WEEPS operation.
∆
∆
bes t
T
or t
T
100%
100%
= ⋅
⋅
+
−