Checkline DFX-7 - Manual (Page 128)

Dakota Ultrasonics
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The rectified wave feature, is only functional when using RECT wave view, and
provides the user the following display options:
Outline – Draws the unfilled outline of the waveform.
Filled – Draws a filled version of the waveform.
Detect Mark:
The detect mark is another look and feel option for displaying the detection indicator.