2010NF A09-320-2:2010 Non-destructive testing - Characterization and verification of ultrasonic examination equipment - Part 2 : probes.
2005NF A09-320-2/A1:2005 Non-destructive testing - Characterization and verification of ultrasonic examination equipment - Part 2 : probes.
0000 NF A09-320-2:2001
1986NF A09-330:1986 Non-destructive testing. Ultrasonic testing. Method of evaluation of focused ultrasonic beam characteristics under working and special use conditions.