Chapter 3. Making Measurements
68 USM Go Operator’s Manual
3.1.2 Selecting the TOF-Detection Method
A-Scan signals crossing either Gate A or Gate B are evaluated for the purposes of flaw detection and material thickness evaluation. When
the signal crosses Gate A or Gate B, either the gate-crossing point (i.e. the flank) of the signal, or the maximum point (i.e. the peak) of the
signal in that specific gate is used for evaluation purposes. The TOF MODE function allows the user to specify which A-Scan feature
(FLANK or PEAK or JFLANK) is used to evaluate the signal in each gate.
1. In the ACQUIRE menu, activate the GATE A or GATE B submenu using the joystick ( ).
2. Use the joystick ( ) to select the TOF MODE function.
3. To change the gate detection mode, either move the joystick ( ) or press the function toggle. The following options are available:
• PEAK - All detection, whether time-based and peak height, is based on the HIGHEST triggering echo in the gate.
• FLANK - The time-based triggering point is the first flank to cross the gate, and amplitude-based results are based on the HIGHEST peak
of any echo crossing the gate. This is not necessarily the peak of the same echo whose flank triggered the gate.
• JFLANK - The time-based triggering point is the first flank to cross the gate, and the amplitude-based results are based on the peak of this
first echo to cross the gate. This is not necessarily the highest echo in the gate.
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