研制了可工作于2—250MHz的超声衰减、声速测试仪,它利用反射脉冲回波列与指数衰减波形相比较的方法测量表达为dB/μs或dB/cm的衰减系数值.可以由电位器刻度盘读数,查衰减系数定标曲线,求出衰减系数值;也可以由选通门电路任意选出反射脉冲回波列中的两个脉冲,送入与本机配合使用的视频脉冲对数差分放大器放大后,由电表指示或在X-Y函数记录仪上自动记录. An attenuated and sonic velocity testers, operating at a frequency of 2 to 250 MHz, have been developed that measure the attenuation factor expressed in dB / μs or dB / cm using a method that compares the reflected pulse echo train with the exponential decay waveforms. Dial reading, check the attenuation coefficient calibration curve, find the attenuation coefficient value; can also be selected by the gate circuit arbitrarily selected reflected pulse echo train two pulses into the machine with the use of the video pulse log After the differential amplifier is amplified, it is indicated by the meter or automatically recorded on the XY function logger.