Four channel seismograph

Downhole seismic testing is one of the most popular investigations in the study of ground layers in construction, oil industry and mining projects. This test provides the engineers and researchers of geophysics and geotechnics, with valuable data that can be acquired very efficiently at a reasonable cost. The FD302 tester is a 4 channel seismograph, designed for downhole seismic testing. This tester which satisfies all the requirements of ASTM D-7400 standard, comprises of a probe and a handheld electronic processing & display module. This portable solution allows engineers to efficiently and easily operate the 4 channel seismograph for downhole seismic testing. The acquired P & S waveforms can be visualized and stored for future study.k

The FD302 probe includes three geophone sensors with sensitivities both to P and S waves. The acquired P and S wave signals are transmitted to the seismograph as analog signals via a 35m cable and then pre-amplified and digitized in the handheld device. Up to 4 geophones can be connected to the FD302 seismograph. There is another separate input for the trigger signal which can originate from a geophone, a capacitive microphone or simply a contact wire. The P & S signals are displayed on a color LCD panel, and the keyboard facilitates the user with simple & easy to use data visualization tools. An application software is supplied with the device to help editing and post-processing the captured signals under windows operating systems. The waveforms are saved in the device’s built-in flash memory and can be further retrieved by a laptop or desktop computer for analysis, reporting & future reference.ug