DMTA-10004-01EN, Rev. D, November 2016
Basic Operation
67
zero compensation is responsible for that task (see “Calibrating the Instrument”
on page 67 and “Material Sound Velocity and the Zero Calibrations” on page 71).
5.2.1
Calibrating the Instrument
When you want to make accurate measurements, you need to perform the following
calibrations:
•
Material sound velocity calibration
•
Zero calibration
You must perform the calibrations using a thick and a thin sample of precisely known
thicknesses. The sample must be made of the same material as the parts to be
inspected (see “Test Blocks” on page 70 for details on test blocks).
The following procedure is illustrated using a dual element probe and a 5-step test
block. Refer to “Calibration” on page 66 for more details on the calibration process.
To calibrate the instrument
1.
To perform the material sound velocity calibration (see Figure 5-4 on page 68):
a)
Place a drop of couplant on the surface of the thick part of the test block.
b)
Couple the transducer to the thick part of the test block using moderate to
firm pressure.
The waveform and the thickness reading appear on the screen.
c)
Press
[CAL VEL]
.
d)
When the thickness reading is stable, press
[ENTER]
.
e)
Using the arrow keys, edit the thickness value to match the known thick
thickness of the test block.
Summary of Contents for 38DL PLUS
Page 9: ...DMTA 10004 01EN Rev D November 2016 Table of Contents ix Index 297 ...
Page 10: ...DMTA 10004 01EN Rev D November 2016 Table of Contents x ...
Page 28: ...DMTA 10004 01EN Rev D November 2016 Important Information Please Read Before Use 16 ...
Page 30: ...DMTA 10004 01EN Rev D November 2016 Introduction 18 ...
Page 50: ...DMTA 10004 01EN Rev D November 2016 Chapter 2 38 ...
Page 60: ...DMTA 10004 01EN Rev D November 2016 Chapter 3 48 ...
Page 102: ...DMTA 10004 01EN Rev D November 2016 Chapter 6 90 ...
Page 222: ...DMTA 10004 01EN Rev D November 2016 Chapter 11 210 ...
Page 254: ...DMTA 10004 01EN Rev D November 2016 Chapter 13 242 ...
Page 274: ...DMTA 10004 01EN Rev D November 2016 Chapter 14 262 ...
Page 286: ...DMTA 10004 01EN Rev D November 2016 Chapter 15 274 ...
Page 294: ...DMTA 10004 01EN Rev D November 2016 Appendix A 282 ...
Page 300: ...DMTA 10004 01EN Rev D November 2016 Appendix C 288 ...
Page 306: ...DMTA 10004 01EN Rev D November 2016 List of Figures 294 ...
