Definitions

For each Definition dialog you select method, parameters and output from the crossing analysis.

Method

Defines whether the crossing analysis must be performed in upward (default) or downward direction.

Crossing level

Is the level, at which the up- or down crossing of which detects a new event. You can specify a value or use the time series mean value (default).

Threshold level

The threshold level is a part of a low-level crossing filter for elimination of noise. The threshold level defines a small amount by which the reference level must be exceeded before the beginning of an event is accepted. You can specify an absolute value or define a level relative to the standard devia­tion of the time series (default).

Threshold period

The threshold period is a part of a low-level crossing filter for elimination of noise. The threshold period defines a duration that must be exceeded before the can event can be accepted. An absolute value must be given (default is zero).

Output

For each event the following output is available:

·         Peak to peak value

·         Crossing level to crest (maximum value during the event minus the crossing level)

·         Crossing level to through (crossing level minus the minimum value dur­ing the event)

·         Zero to crest (maximum value during the event)

·         Zero to through (minimum value during the event)

·         Standard deviation within event

·         Crossing time (time at which the event starts)

·         Duration (period) of event