DMTA-10055-01EN, Rev. A, February 2015
Chapter 9
146
angle. The shallow reflector depth allows for zero offset calibration, and the deep
reflector depth allows for velocity calibration.
9.3
Calibrating with a Straight Beam Transducer
The sample straight beam calibration described below is performed using an
Olympus transducer part number A109S-RM, with a frequency of 5.0 MHz and an
element diameter of 13 mm (0.50 in.).
The calibration requires a test block with two known thicknesses made from the
material to be measured. Ideally, the two thicknesses should represent thicknesses
that are both below and above the expected thickness of the material being inspected.
For this example, Olympus standard 5-step steel test block (P/N: 2214E) is used. The
steps measure 0.100 in., 0.200 in., 0.300 in., 0.400 in., and 0.500 in.
If the EPOCH 650 is set to work in metric units, the calibration process is exactly the
same, except that the entries are in millimeters rather than inches.
To calibrate using a straight-beam transducer
1.
Follow the initial setup procedure outlined in “Basic Setup” on page 143.
2.
Connect the transducer to an appropriate cable and then connect the cable to
either of the transducer connectors at the top of the instrument.
3.
Choose
Auto Cal > Type = Thickness
.
4.
Couple the transducer to the thin calibration block step. For this example, the
transducer is coupled to the 0.200 in. step.
Depending on the frequency of the contact transducer being used, it might be
impossible to obtain a proper reading on very thin material.
5.
Use the G1Start button (P5 key) to position gate 1 so that the first back-wall echo
from the known thickness step exceeds the gate threshold.
Summary of Contents for EPOCH 650
Page 12: ...DMTA 10055 01EN Rev A February 2015 List of Abbreviations xii...
Page 30: ...DMTA 10055 01EN Rev A February 2015 Introduction 18...
Page 54: ...DMTA 10055 01EN Rev A February 2015 Chapter 1 42...
Page 84: ...DMTA 10055 01EN Rev A February 2015 Chapter 3 72...
Page 126: ...DMTA 10055 01EN Rev A February 2015 Chapter 5 114...
Page 148: ...DMTA 10055 01EN Rev A February 2015 Chapter 7 136...
Page 154: ...DMTA 10055 01EN Rev A February 2015 Chapter 8 142...
Page 236: ...DMTA 10055 01EN Rev A February 2015 Chapter 10 224...
Page 332: ...DMTA 10055 01EN Rev A February 2015 Appendix B 320...
Page 342: ...DMTA 10055 01EN Rev A February 2015 Appendix C 330...
Page 346: ...DMTA 10055 01EN Rev A February 2015 Appendix D 334...
Page 362: ...DMTA 10055 01EN Rev A February 2015 Index 350...
