This document describes methods and acceptance criteria for verifying the performance of ultrasonic equipment (that is instrument and probe combined as defined in EN 12668-1 and EN 12668-2) by the use of appropriate standard calibration blocks. These methods are not intended to prove the suitability of the equipment for particular applications. The methods described are suitable for the use by operators working under site or shop floor conditions. The methods only apply to pulse echo equipment using A-scan presentation, with gain controls or attenuators calibrated in steps not greater than 2 dB and used essentially in contact testing. These methods are specifically intended for manual testing equipment. For automated testing different tests can be needed to ensure satisfactory performance. This document (EN 12668-3:2013) has been prepared by CEN/TC 138 "Non-destructive testing", the secretariat of which is held by AFNOR (France). The responsible German committee is Working Committee NA 062-08-23 AA "Ultraschallprüfung" ("Ultrasonic testing") at the Standards Committee Materials Testing (NMP) at DIN.