This document specifies methods and acceptance criteria for assessing the electrical performance of digital ultrasonic instruments for pulse operation using A-scan display, operating within the frequency range 0,5 MHz to 15 MHz, for manual ultrasonic non-destructive testing with single or dual-element probes. This document is applicable for multi-channel instruments also. This document may partly be applicable to ultrasonic instruments in automated systems but then other tests can be needed to ensure satisfactory performance. Ultrasonic instruments for continuous waves are not included in this document. Ultrasonic phased array instruments are not included in this document, see e. g. ISO 18563-1. If a phased array instrument has dedicated connectors for single or dual-element probes this document is applicable for these channels.