58
EPOCH 4PLUS
Figure 20
Calibrating for a Thick Block Using a Straight Beam Transducer
8. A thickness reading appears in large text above the A-Scan. Once a steady reading is
achieved, press [VEL]. The screen freezes and a pop-up box appears again on the
screen.
Use the alphanumeric keypad to enter the exact known thickness of the test sample.
For this example, press [5], [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 21
Entering a Thick Standard Value
9. Press [ENTER] to complete the Auto-Calibration. The Zero Offset and Velocity
parameters adjust automatically, and the correct thickness reading of any gated echo
displays on the screen.
Note:
It is possible to use the Auto-Calibration feature on a single test block of
known thickness. You can use multiple backwall echoes instead of coupling
on both a thin step and a thick step. You can leave the transducer coupled on
the thin step, move the gate over to one of the multiple backwall echoes and
enter the correct soundpath thickness (2, 3, 4, etc. multiple of the first
backwall echo) during the velocity portion of the calibration.
Summary of Contents for Panametrics Epoch 4 Plus
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