| Testing methods |
pulse-echo method |
| back-wall echo attenuation (mirror-shadow) method |
| multiple back-wall echo attenuation method |
| combinations thereof |
| Operating frequency range (longitudinal and transverse defect testing system) |
2.5–5.0 MHz |
| Testing sensitivity (longitudinal and transverse defect testing system) |
through hole 1.6 mm in diameter |
| notch with a depth of 5 % of wall thickness |
| Sensitivity margin in the testing zone – signal-to-noise ratio (longitudinal defect testing system) |
at least 24 dB |
| Permissible wall thickness measurement error |
±0.05 mm |