This document identifies the functional characteristics of a multi-channel ultrasonic phased array instrument used for array probes and provides methods for their measurement and verification. This document can partly be applicable to ultrasonic phased array instruments in automated systems, but then, other tests might be needed to ensure satisfactory performance. When the phased array instrument is a part of an automated system, the acceptance criteria can be modified by agreement between the parties involved. This document also can partly be applicable to FMC instruments and TFM instruments. This document gives the extent of the verification and defines acceptance criteria within a frequency range of 0,5 MHz to 10 MHz. The evaluation of these characteristics permits a well-defined description of the ultrasonic phased array instrument and comparability of ultrasonic phased array instruments.