Ultrasonic fault detection system using digital conversion system - wide analog dynamic range

Method and apparatus for performing ultrasonic testing of an object, processing the echo signals received in at least three signal channels from the object under test. Echo signal, the use of multiple analog high-pass filter and a low pass filter and a variable gain amplifier in a manner that eliminates the need, in order to extend the dynamic range of the associated A / D converter system, individual channels It is scaled with different degrees along. Thus complexity is reduced, and avoids the performance limits. Digital - by analog converters, are otherwise input signal samples scaled, also, by the selection circuit, the gain is the largest, and the overflowed analog not - output of the digital output obtained from the digital converter It is selected. Digital output, combined seamlessly, output that can be displayed as a scanning display indicating the location of the fault is generated.