ISO INTERNATIONAL STANDARD 16811 First edition 2012-04-01 Non-destructive testing Ultrasonic testing Sensitivity and range setting Essais non destructifs Controle par ultrasons Réglage de la sensibilité et de la base de temps Reference number ISO 16811:2012(E) ISO 2012 by IHS under lic itted without license from IHS Not for Resale ISO 16811:2012(E) COPYRIGHTPROTECTEDDOCUMENT @ISO:2012 IsO's memberbody in the country of the requester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @IsO 2012-All rights reserved etworking permitted without license from IHS Not for Resale ISO 16811:2012(E) Contents Page Foreword. Introduction ... 1 Scope... 2 Normative references. 3 General. 3.1 Quantities and symbols. 3.2 3.3 Categories of test objects... 3.4 Contouring of probes... 3.4.1 Longitudinally curved probes, 3.4.2 Transversely curved probes .. 3.4.3 Concave scanning surface. 4 Determination of probe index and beam angle 4.1 General .. 4.2 4.2.1 Calibration block technique 4.2.2 Reference block technique... 4.3 Probes curved longitudinally .... 4.3.1 Mechanical determination .... 4.3.2 Reference Block Technique.. 4.4 Probes curved transversely ... 4.4.1 Mechanical determination .... 4.4.2 Reference block technique. 4.5 Probes curved in two directions.. 4.6 Probes for use on materials other than non-alloy steel..... 5 Time base setting ... 5.1 5.2 Reference blocks and reference reflectors.... 5.3 Straight beam probes.. 10 5.3.1 Single reflector technique .... 10 5.3.2 Multiple reflector technique... 5.4 Angle beam probes .... 5.4.1 Radius technique.. 10 5.4.2 Straight beam probe technique ..... 5.4.3 Referenceblocktechnique.. 5.4.4 Contoured probes ... 5.5 Alternative range settings for angle beam probes 11 5.5.1 5.5.2 Curved surfaces . 6 Sensitivity setting and echo height evaluation .... 6.1 General ...... .13 6.2 6.3 Distance Amplitude Curve (DAC) technique 6.3.1 Reference blocks... 13 6.3.2 Preparation of a Distance Amplitude Curve .... .14 6.3.3 6.3.4 Evaluation of signals using a reference height... .15 6.4 Distance Gain Size (DGS) technique... 16 6.4.1 .16 6.4.2 Reference blocks... 6.4.3 Use of DGS diagrams .18 6.4.4 Restrictions on use of the DGS technique due to geometry 20 Copyrght International Organization for Standardizalon ghts reserved ili Not for Resale