Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 49)

AORM Software Package
923133 Rev A ISSUED: June 2013
47
DP2C DELTA PIT TO CLOCK
Description
Dp2c provides a measurement of the time between the leading edge of the pit (or spaces of
interest) and the nearest specified clock edge. The measurement is calculated between the
points where the data and clock signals cross selected voltage thresholds.
The value calculated depends on the clock and data edges selected, as shown in the table below.
If in the Data Slope menu Pos (positive) is selected, the measurement is performed from the
leading edges of positive polarity pits. If Neg (negative) is selected, the measurement is
performed from the leading edges of negative polarity spaces. And if Both is selected, the
leading edges of both pits and spaces are used in the calculation. The sizes of pits or spaces
used in the measurement are also determined by the range of ‘nT’ values chosen.
DATA SLOPE
CLOCK
EDGE
Pos Neg Both
positive
time between leading
edge of positive polarity
pit and nearest positive
clock edge time between leading
edge of negative
polarity space and
nearest positive clock
edge time between leading
edge of pits and spaces
to nearest positive
clock edge
negative
time between leading
edge of positive polarity
pit and nearest
negative clock edge time between leading
edge of negative
polarity space and
nearest negative clock
edge time between leading
edge of pits and spaces
to nearest negative
clock edge
near
time between leading
edge of positive polarity
pit and nearest clock
edge time between leading
edge of negative
polarity space and
nearest clock edge time between leading
edge of pits and spaces
and nearest clock edge
For the positive polarity pit example shown as the zoom of the measurement (next two figures),
the measurements t
+, t-, tn are for a single Delta Pit-to-Clock measurement configured for
positive edge, negative edge, or nearest edge, respectively.