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EPOCH 4PLUS
For example, if Gate 1 Start is set to 0.25" (6.35 mm) and Gate 2 Start is set to 0.40" (10
mm), then the blank period is 0.15" (3.8 mm) of metal path. If the first detected echo
breaks Gate 1 at 0.35" (8.9 mm), then Gate 2 Start automatically adjusts by the value
of the blanking period to 0.50" (0.35" + 0.15") or 12.7 mm (8.9 mm + 3.8 mm).
There is a trade-off in defining the blanking period. While a relatively long period may
prevent false readings, the minimum measurable thickness is limited to a value
slightly greater than the blanking period.
Figure 12 Set-up for Peak-to-Peak Measurement
6.5 Locating Flaws with an Angle Beam Transducer
During an angle beam inspection, you can obtain accurate and reliable soundpath
information using the EPOCH 4PLUS’s high resolution distance calculator.
If a refracted angle is entered into the EPOCH 4PLUS and an echo is exceeding the gate
threshold, all angular soundpath components are displayed at the top of the A-Scan
display.
Figure 13 Angle Beam Inspection
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