1. Scope 1.1 This practice describes procedures for evaluating the following performance characteristics of ultrasonic pulse-echo testing systems:Horizontal Limit and Linearity; Vertical Limit and Linearity; Resolution-Entry Surface and Far Surface; Sensitivity and Noise; Accuracy of Calibrated Gain Controls. Relevant terminology can be found in Terminology E1316 and IEEE Standard 100. 1.2 Ultrasonic test systems using pulsed-wave trains and A-scan presentation (rf or video) may be evaluated. 1.3 The procedures are applicable to shop or field conditions; additional electronic measurement instrumentation is not required. 1.4 This practice establishes no performance limits for test systems; if such acceptance criteria are required, these must be specified by the using parties. 1.5 The specific parameters to be evaluated, conditions and frequency of test, and report data required, must also be determined by the user. 1.6 This practice is intended primarily for the evaluation of a complete testing system, including search unit, instrument, interconnections, and fixtures. However, certain characteristics of the instrument alone can be determined within the limitations discussed. 1.7 Required test apparatus includes selected test blocks and a precision external attenuator (where specified) in addition to the system to be evaluated. 1.8 Precautions relating to the applicability of the procedures and interpretation of the results are included. 1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.