Chapter 4. Measuring And Recording Data; Setting Up Data Measurements; Positioning Gate A And Gate B - GE DMS Go Operator's Manual

Chapter 4. Measuring and Recording Data

This chapter will explain how to measure thicknesses and store those measurements in the data file you have created in Chapter 3. If you
wish to store the measurement data and have not yet created a data file, refer to Chapter 3.
4.1

Setting up Data Measurements

4.1.1

Positioning Gate A and Gate B

Setting the position and the characteristics of Gate A and Gate B is the first step in configuring the instrument for material thickness
measurements. 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.
Each probe selected has default gate settings which should work for most applications. If the echoes are not being properly measured, the
user can adjust the gating to ensure the DMS Go is measuring the proper echoes. To configure the gate parameters, proceed to the
appropriate section:
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