Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 51)

AORM Software Package
923133 Rev A ISSUED: June 2013
49
The measurement has configurable units. If absolute time is specified, the value is simply the
time as indicated above. If percent is specified, the value of the measurement is the time
normalized to the local clock period. The local clock period is calculated as the time between the
two clock edges bracketing the clock edge used for the delta time measurement:
∆ ∆
∆
∆
p c t
T
or t
T
or t
T n
n
2
100%
100%
100%
= ⋅
⋅
⋅
+
+
−
−
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 that begins and ends the pit/space of interest
between the parameter cursors)
, and when 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 average time between leading pit/space edges
and nearest clock edges for all pits/spaces within the selected ‘nT’
range for the last acquisition.
Parameter Statistics On
Average, minimum, maximum, and sigma of the Delta Pit-to-Clock
calculated for all identified pits/spaces within the selected ‘nT’
range for all acquisitions since the last C
LEAR S WEEPS operation.
nT Table
List of values of the average Delta Pit-to-Clock for each group of
pits/spaces of common ‘nT’ width for the last acquisition.
Histogram Function
Histogram graph of the value of the Delta Pit-to-Clock calculated
for all pits/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 Delta Pit-to-Clock calculated for all
pit/space within the selected ‘nT’ range for all acquisitions since
the last C
LEAR S WEEPS operation.