一种基于33250A型信号源的数字超声探伤仪水平线性误差测试方法
摘  要：针对数字式超声探伤仪水平线性误差的准确测试，提出一种方法，即基于33250A型函数信号发生器，利用其函数信号发生器外部触发延时输出的功能模拟超声探伤仪水平线性的距离，可以准确地测试数字式超声探伤仪的水平线性误差。通过实验设计和实验数据验证，结果表明：该方法有效可行，可为超声探伤仪的水平线性误差测试提供参考。
关键词：超声探伤仪；扫描范围；水平线性误差；电信号
文献标志码：A       文章编号：1674-5124（2016）01-0038-03
Horizontal linear error test method for digital ultrasonic flaw detector based on
33250A signal generator
CHEN Shenli， HE Zhuobin， YANG Dejun
（Guangdong Institute of Metrology，Guangzhou 510405，China）
Abstract: A 33250A function signal generator is used to test accurate horizontal linear error of digital ultrasonic flaw detectors. First， the delay output triggered by the function signal generator is applied to simulate the horizontal linearity distance of the detector. Then， the horizontal linear error could be accurately tested according to the formula that distance is the product of time and speed. Eventually， this method is proved feasible through experimental design and data.
Keywords: ultrasonic flaw detector； scanning range； horizontal linear error； electrical signal