1.1 本指南描述了以电子方式测量超声波仪器某些部分的以下性能相关特性的程序: 1.1.1 电源部分: 线路调节， 电池放电时间，以及 电池充电时间。 1.1.2 脉冲发生器部分: 脉冲形状， 脉冲幅度， 脉冲上升时间、脉冲长度和 脉冲频谱。 1.1.3 接收器部分: 垂直线性， 频率响应， 噪声和灵敏度，以及 dB控制。 1.1.4 时基部分: 水平线性，以及 时钟（脉冲重复率）。 1.1.5 闸门/警报部分: 延迟和宽度， 决议 警报级别， 增益均匀性， 模拟输出，以及 后回音门。 1.2 本指南是对实践的补充 E317 , D2548 且不用于评估检验/生产线上超声波检测仪器的性能特征。 注1: 不需要访问内部电路。 1.3 单位- 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 4.1 本指南中所述的推荐测量程序旨在提供与性能相关的测量，这些测量可以在指定的测试条件下使用商用测试仪器进行复制。 这些测量值表明了超声波检测仪器各部分的能力，与特定传感器或检查条件无关。测量是从通常可用的连接器或测试点进行的，因此不需要访问内部电路。此外，本指南不适用于制造商说明可用的电路的维修、校准或维护。它主要用于在100 kHz至25 MHz标称频率范围内工作的脉冲回波探伤仪器，但该程序适用于使用明显更高频率成分的仪器的测量。 4.2 这些程序可用于评估任何脉冲回波超声检测仪器，该仪器可描述为本指南中讨论的电子部分的组合。 注2: 这些程序并非旨在排除使用或应用本文件部分或全部测量技术不适用的设备。 4.3 不能完全描述为本实践中讨论的电子部分组合的超声波检测仪器可以进行部分评估。被评估的超声波检测仪器的每个部分都必须符合相应章节的描述。 4.4 本指南旨在供电子人员用于评估电子系统部件，而非超声波系统特性。

1.1 This guide describes procedures for electronically measuring the following performance-related characteristics of some sections of ultrasonic instruments: 1.1.1 Power Supply Section: line regulation, battery discharge time, and battery charge time. 1.1.2 Pulser Section: pulse shape, pulse amplitude, pulse rise time, pulse length, and pulse frequency spectrum. 1.1.3 Receiver Section: vertical linearity, frequency response, noise and sensitivity, and dB controls. 1.1.4 Time Base Section: horizontal linearity, and clock (pulse repetition rate). 1.1.5 Gate/Alarm Section: delay and width, resolution, alarm level, gain uniformity, analog output, and back echo gate. 1.2 This guide complements Practice E317 , D2548 and is not intended for evaluating the performance characteristics of ultrasonic testing instruments on the inspection/production line. Note 1: No access to internal circuitry is required. 1.3 Units— The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 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. ====== Significance And Use ====== 4.1 The recommended measurement procedures described in this guide are intended to provide performance-related measurements that can be reproduced under the specified test conditions using commercially available test instrumentation. These measurements indicate capabilities of sections of the ultrasonic testing instrument independent of specific transducers or examination conditions. Measurements are made from normally available connectors or test points so that no access to internal circuitry is required. Further, this guide is not intended for service, calibration, or maintenance of circuitry for which the manufacturer's instructions are available. It is intended primarily for pulse echo flaw detection instruments operating in the nominal frequency range of 100 kHz to 25 MHz, but the procedures are applicable to measurements on instruments utilizing significantly higher frequency components. 4.2 These procedures can be applied to the evaluation of any pulse-echo ultrasonic testing instrument which can be described as a combination of the electronic sections discussed in this guide. Note 2: These procedures are not intended to preclude the use or application of equipment for which some or all of the measurement techniques of this document are not applicable. 4.3 An ultrasonic testing instrument that cannot be completely described as a combination of the electronic sections discussed in this practice can be partially evaluated. Each portion of the ultrasonic testing instrument that is evaluated must fit the description for the corresponding section. 4.4 This guide is meant to be used by electronic personnel to evaluate the electronic system components and not the ultrasonic system characteristics.