Olympus nortec 600 - Page 362

DMTA-10040-01EN, Rev. E, February 2018
List of Figures352
Figure 5-135 Materials—dual frequency for heat exchanger tubing ............................... 216
Figure 5-136 The Heat Exchanger Tubing application ...................................................... 217
Figure 5-137 The scan of the thru-wall hole ........................................................................ 218
Figure 5-138 Adjusting the frequency 1 signal phase ....................................................... 219
Figure 5-139 Adjusting the frequency 1 gain ...................................................................... 219
Figure 5-140 Adjusting the frequency 2 angle .................................................................... 220
Figure 5-141 The scan of the support ring .......................................................................... 220
Figure 5-142 Adjusting the angle of the frequency 2 signal on the support ring .......... 221
Figure 5-143 Adjusting the gain of the frequency 2 signal on the support ring ............ 221
Figure 5-144 The support ring scan with AUTO MIX ....................................................... 222
Figure 5-145 The support ring’s signal successfully subtracted ...................................... 223
Figure 5-146 The scan of the thru-wall hole ........................................................................ 223
Figure 5-147 Fine-tuning the MIX angle .............................................................................. 224
Figure 5-148 The scan of the flat-bottom holes ................................................................... 224
Figure 5-149 The list of all parameters ................................................................................ 225
Figure 5-150 The strip chart display .................................................................................... 226
Figure 5-151 The web grid display ....................................................................................... 227
Figure 5-152 The display with adjusted null point and coarse grid ............................... 228
Figure 5-153 An example of marking the probe positions ............................................... 230
Figure 5-154 ECT principles .................................................................................................. 231
Figure 5-155 An example of an ECT differential signal response ................................... 232
Figure 5-156 An air conditioner probe ................................................................................ 232
Figure 5-157 Signals from an A/C probe’s pancake surface coils only ........................... 233
Figure 5-158 The ECT Pitting, Wear, and Cracks application .......................................... 234
Figure 5-159 Example of lower signal lobe when pulling the probe over a flaw .......... 235
Figure 5-160 The scan signal of the thru-wall hole ............................................................ 235
Figure 5-161 Adjusting the signal ......................................................................................... 236
Figure 5-162 Adjusting the frequency 1 gain ...................................................................... 236
Figure 5-163 An example of a nonsaturated support ring signal .................................... 237
Figure 5-164 An example of a saturated support ring signal ........................................... 238
Figure 5-165 The tube scan between the support ring and the thru-wall hole .............. 238
Figure 5-166 The verified signals: thru-wall hole (left) and support ring (right) ........... 239
Figure 5-167 The frequency 2 scan signal of the support ring ......................................... 240
Figure 5-168 The frequency 2 scan signal of the 1.3 mm (0.052 in.) thru-wall hole ...... 240
Figure 5-169 The frequency 2 scan signal of the 1.3 mm (0.052 in.) thru-wall hole with
adjusted angle .................................................................................................. 241
Figure 5-170 The support ring signal after AUTO MIX .................................................... 242
Figure 5-171 The thru-wall hole signal after AUTO MIX ................................................. 243
Figure 5-172 The thru-wall hole signal after AUTO MIX angle adjustment .................. 243
Figure 5-173 The thru-wall hole signal after AUTO MIX gain adjustment .................... 244
Figure 5-174 The tube scan result ......................................................................................... 245
Figure 5-175 Moving the support ring ................................................................................. 246