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EPOCH 4PLUS
Figure 22 Calibrating for a Thin Block Using a Delay Line Transducer
5. Press [ZERO OFFSET] once the reading is steady. The screen freezes and a pop-up
box appears on the screen.
Use the alphanumeric keypad to enter the exact known thickness of the test sample.
For this example, press [1], [0], [0]. The entry appears in the pop-up box.
If you enter an incorrect number, press [0] multiple times to clear the entry and then
type the correct thickness.
Figure 23 Entering a Thin Standard Value
6. Press [CALIBRATION]. The display returns to the live A-Scan. Couple the
transducer to the THICK calibration block step. For this example, the transducer is
coupled to the 0.500" step.
7. Position Gate 1 so that the first backwall echo from the known thickness step is
exceeding the gate threshold. Adjust the gain setting so that the echo amplitude is
approximately 80%. A thickness reading appears in large text above the A-Scan.
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