Calibrating the EPOCH 4PLUS
Part # 910-250C
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3. Couple the transducer to the THIN calibration block step. For this example, the
transducer is coupled to the 0.200" step (depending on the frequency of the contact
transducer being used, it may be impossible to obtain a proper reading on a very thin
material).
4. 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%.
Figure 18 Calibrating for a Thin Block Using a Straight Beam Transducer
5. A thickness reading appears in large text above the A-Scan. Once a steady reading is
achieved, press [ZERO OFFSET]. 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 [2], [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 19 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%.
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