Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 46)

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ISSUED: June 2013 923133 Rev A
BEES BEGINNING ENDING EDGE SHIFT
Description
BEES provides a measurement of both the beginning and ending edge shift for a subject n pit
(space) preceded and followed by a specified space (pit). (See BES and EES.) The
measurement is calculated between the points where the data and clock signals cross selected
voltage thresholds. The clock period T can be entered by the user, or measured from a user
supplied clock signal, as described below.
The value calculated depends on the clock and data edges selected, as shown in the table below.
The Data Slope menu selects the polarity of the subject n pit/space. If Pos (positive) is selected,
the measurement is performed from the beginning and ending edges of positive polarity pits and
is preceded and followed by a space of the specified width. If Neg (negative) is selected, the
measurement is performed from the edges of negative polarity spaces and is preceded and
followed by a pit of the specified width.
DATA SLOPE
CLOCK
EDGE
Pos Neg
Positive
times between edges of
positive polarity subject
pit and nearest positive
clock edge times between edges of
negative polarity
subject space and
nearest positive clock
edge
Negative
times between edges of
positive polarity subject
pit and nearest
negative clock edge times between edges of
negative polarity
subject space and
nearest negative clock
edge
Near
times between edges of
positive polarity subject
pit and nearest clock
edge times between edges of
negative polarity
subject space and
nearest clock edge