回波检验 meaning in Chinese

echo checking

You could transmit the a character code to the video display to generate an echo right after subtracting the a character code from a carriage return .
从“回车”字符减去A字符代码后，你便可以将A字符代码传送到荧光屏显示器，以便立即产生一个回波检验信号。
Method for assessing the overall performance characteristics of ultrasonic pulse echo testing instrument
评定超声脉冲回波检验仪综合性能特征的试验方法
You could transmit the a character code to the video display to generate an echo right after subtracting the a character code from a carriage return
从“回车”字符减去a字符代码后，你便可以将a字符代码传送到荧光屏显示器，以便立即产生一个回波检验信号。