Abstract: A sector image of cement bond can be obtained by using a SBT logging tool.At the bottom of SBT,there is a transmitter with a circular receiver at a distance of 0.6 meters above the transmitter.On the receiver's surface,there are eight electrodes equally separated around the circle.Each electrode receives a waveform and total eight waveforms are in logging.In this paper,some experiments are made for studying the amplitude and frequency of waveforms by changing the pulse amplitude and width.The first positive...