Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 92)

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ISSUED: June 2013 923133 Rev A
TIMJ TIMING JITTER
Description
Timing Jitter provides a measurement of the standard deviation of the difference of the width of
pits and/or spaces from the mean width. The width of the pit/space is determined by the crossing
of the selected voltage threshold. The measurement calculation is compliant with the definition of
Timing Jitter as defined by ISO/IEC JTC1.23.14517 Section 22.4.
Display Options
ORM parameter calculations can be displayed, histogrammed, and trended in a variety of ways.
The table provides a concise description of the value or values displayed using each approach.
DISPLAY TYPE VALUE DISPLAYED
Parameter Statistics Off
Single value of the overall timing jitter for pits/spaces of
interest for last acquisition.
Parameter Statistics On
Average, minimum, maximum, and sigma of the overall timing
jitter value calculated per acquisition for all acquisitions since
the last C
LEAR S WEEPS operation.
nT Table
List of values of the timing jitter for each individual ‘nT’ in the
selected range of ‘nT’ for the last acquisition.
Histogram Function
Histogram of the overall timing jitter values calculated for each
acquisition for all acquisitions since the last C
LEAR S WEEPS
operation.
Trend Function
Trend of the overall timing jitter values calculated for each
acquisition for all acquisitions since the last C
LEAR S WEEPS
operation.
Example
A waveform is acquired with 3T, 4T, and 5T pit widths as follows:
3T 4T 5T
695 ns 925 ns 1.16 µs
690 ns 1.18 µs
696 ns
T is 231.5 ns, and the timing jitter parameter has been configured for a range of 3T through 5T.
The 3T mean is 693.66 ns. The 4T mean is 925 ns. The 5T mean is 1.17 µs.