Calibrating the EPOCH 4PLUS
Part # 910-250C
65
Connect the transducer to an appropriate cable and then connect the cable to either of
the transducer posts on the EPOCH 4PLUS.
2. Enter the correct refracted angle for the transducer/wedge combination. For this
example, enter 45
o
.
3. Enter the approximate shear wave velocity of the material being inspected. For this
example using carbon steel, enter a velocity of 0.1280 in/µs (3251 mm/µs if working
in metric units).
4. Enter an appropriate range for the test block being used. For this example, enter a
range of 10.000 in (250.00 mm if working in metric units).
Review sections 7.5.1 - 7.5.4 for the following procedures:
•
Locating the Beam Index Point (B.I.P.) of the probe
•
Verifying the Refracted Angle (Beta)
•
Calibrating for Distance
•
Calibrating for Sensitivity
Note:
If the EPOCH 4PLUS is set to work in metric units in each procedure listed
above, the calibration process is exactly the same, except that the entries
below will be in millimeters, rather than inches.
7.5.1
Locating the Beam Index Point (B.I.P.)
To locate the BIP, follow these steps:
1. Couple the probe to the test block at the “0” mark.
Figure 30
Reference Block Displaying the “0” Mark
2. Manipulate the probe until a high amplitude signal appears on the screen after the
Main Bang. This is the reflection from the large arc of the block that is located on the
Type I block at 4" (100 mm).
3. Move the probe forward and backward to bring the echo to its maximum amplitude
(peak it up). Make sure the echoes do not exceed 100%. Reduce the Gain setting if
necessary.
Note:
The Peak Memory feature on the EPOCH 4PLUS is an excellent tool to aid
in finding the BIP. Press [PEAK MEM] to turn on the feature. This feature
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Страница 184: ...174 EPOCH 4PLUS Figure D 3 VGA Adapter Cable Olympus NDT Part EP4 C 15VGA 6 Figure D 4 VGA Adapter Cable Wire Run List...