X-Stream Operator’s Manual
WM-OM-E Rev I 399
ltut Local Time Under Threshold
Definition
The time a local feature spends under a user-specified percentage of its
peak-to-trough amplitude.
Description
The peak-to-trough height of a local feature is measured. The time the
local feature spends under a user-specified percentage of this height is
determined, and the average for all the waveform’s local features is
displayed as ltut. Provided for histograms is the time spent under the
threshold by each local feature between the parameter cursors.
Parameter Settings
Selecting this parameter from the Measure menus displays hysteresis
and level percent menus. The associated fields allow you to set values in
those menus: a specified number of vertical divisions or a percentage of
the peak-to-peak height of the local feature.
Example
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