Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 70)

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ISSUED: June 2013 923133 Rev A
PMODA PIT MODULATION AMPLITUDE
Description
Pit Modulation Amplitude provides a measurement of the ratio of the Pit Average Amplitude (paa)
for the low ‘nT’ pits/spaces in the data signal to the Pit Top (ptop) of the high ‘nT’ pits in the data
signal:
PMODA
paa
avg top
low n
high n
= _
_
( )
The low and high ‘nT’ values to be used for performing the calculation are provided by the user
through the associated measurement configuration options. Some measurements of modulation
amplitude require the low and high n index to be identical. The value is shown is decimal. The
measurement calculation is compliant with the definition of Modulation Amplitude as defined by
IEC 908:1987 Section 9.2 and ISO/IEC 10149:1995 (E) Section 12.2.
Note: This measurement must be performed on the DC-coupled optical data waveform, otherwise incorrect values will
result.
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 modulation amplitude for the last acquisition.
Parameter Statistics On
Average, minimum, maximum, and sigma of the single
modulation amplitude value calculated per acquisition for all
acquisitions since the last C
LEAR S WEEPS operation.
Histogram Function
Histogram of the modulation amplitude value calculated per
acquisition for all acquisitions since the last C
LEAR S WEEPS
operation.
Trend Function
Trend of the single modulation amplitude value calculated per
acquisition for all acquisitions since the last C
LEAR S WEEPS
operation.