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Chapter 3. Making Measurements
3.1.1
Positioning the Gates
Use the procedures in this section to set the vertical and horizontal position of Gate A and Gate B. Remember that gate position has the
following effects on instrument performance:
•
A-Scan echoes on the right side of the display screen represent features that occur at a greater depth from the test-material surface than
those on the left side of the display screen. Therefore, moving a gate to the right means that the gate is evaluating a deeper portion of the
test material.
•
A wider gate setting means that the gate is evaluating a thicker portion of the test material.
•
Increasing the vertical height, called the threshold, of a gate means that only reflected signals of sufficiently large amplitude will cross
the gate.
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USM Go Operator's Manual
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