DMTA-10055-01EN, Rev. A, February 2015
Chapter 11
236
Figure 11-10 DAC with 3 dB scan gain - reference correction active
11.2.3.2
Curve Adjustment Gain (DAC Gain or TCG Gain)
The overall gain level of the entire DAC curve and TCG line setup can be adjusted
higher or lower from the Reference Gain. Most inspection codes do not permit
reflectors to be sized below 20 % FSH. Therefore, to inspect beyond a certain
depth/sound path time within a part, it is necessary to raise the gain of both the live
A-scan and the DAC curve to continue the inspection. This is accomplished on the
EPOCH 650 using the curve gain (DAC curve adjustment gain).
To adjust the curve gain
1.
Choose
DAC/TCG > Gain Step
, and then use the Up and Down arrow keys or the
adjustment knob to choose the desired increment of the gain adjustment.
2.
Press
DAC Gain
(P1 key), and then adjust the curve gain by the selected
increment either positive or negative.
Figure 11-11 on page 237 shows a DAC setup with DAC gain in use to provide
accurate echo amplitude measurement by placing the echo close to 80 % FSH.
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...
