Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 14)

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ISSUED: June 2013 923133 Rev A
F i e l d D e s c r i p t i o n
Show
Determines which table of values is displayed below the grid.
When Parameters is selected, a checkbox is displayed that
enables you to turn on or off the display of statistics values.
Source This can be a channel, math function, or memory
trace. A Use Equalizer checkbox is provided to
apply a filter to the data source.
Data Gate This can be a channel, math function, memory
trace, or other. It specifies the input that will be
used to determine where to perform measurements
on the input signal. The polarity is always high.
Use
Equalizer This checkbox enables filtering of the data source.
Data Slope Polarity of the pits/spaces to use for the
measurement, when appropriate. Pos polarity
refers to pits, Neg polarity refers to spaces, Both
can be selected to use both pits and spaces.
Data
Hysteresis The Hysteresis selection imposes a limit above and
below the Threshold, which precludes
measurements of noise or other perturbations
within this band. The width of the band is specified
in divisions.
Guidelines for Use
1. Hysteresis must be larger than the maximum
noise spike you want to ignore.
2. The largest value of hysteresis usable is less
than the distance from the threshold to the closest
extreme value of the waveform.
3. Unless you know the largest noise and closest
extreme level that will ever occur on any cycle,
leave some margin on both sides of the threshold.