Patent ID: 8490491

Claim:
An inspection device configured for inspecting a test object, comprising: a probe unit configured to excite the test object to produce a wave response, to receive the wave response and to produce from the wave response one or more corresponding electric echo signals; a receiver having one or more signal processing channels, each channel configured to scale the echo signal to a respective different degree and to produce respective, corresponding scaled signals; one or more analog to digital converters configured to digitize the scaled signals and to produce therefrom corresponding digitized signal samples; a digital memory for storing the digitized signal samples; one or more overflow indicators each providing a respective overflow indication for a respective processing channel, wherein said overflow indicators are configured to provide overflow indications associated with at least one signal sample point preceding a sample point that is overflowed, wherein the overflow indicators include a respective delay component to add a delay of at least one sample point to the overflow indicators, and a channel selection element configured to select the digitized signal samples from the respective signal processing channels that do not have overflow indications according to the respective overflow indicator so that the device provides the largest amplification without having overflowed.