To achieve the best performance from any borehole instrument, you must make sure that the sensor electronics, its casing and the power supply share a common, local ground, and that all power and data lines are adequately protected against lightning and other transients. Read more...
A Matlab extension for Scream! lets you easily determine the exact orientation of a borehole sensor relative to a reference sensor at the surface. Read more...
To obtain the highest quality seismic data, it is desirable to ensure that the output of the sensor-digitiser system is as close to zero as possible when there is no ground movement. This is especially true for accelerometers, which are capable of measuring constant (i.e. zero-frequency) acceleration. Read more...
Cross-axis rejection is the ability of a component of a triaxial instrument to ignore signals which arrive perpendicular to the axis of sensitivity of that component. Read more...
This guide will help you set up a Güralp 3T instrument and DM24 digitiser in a seismic vault, with (optionally) an EAM to connect them to a local computer network. Read more...
Güralp 6TD seismometers are ideal for cost-effective, rapid seismic installations. This guide describes the entire procedure of testing and installing an array of 6TD instruments, from delivery to operation. Read more...
This page discusses two concepts in analogue signal transmission: “single-ended” and “differential”. Analogue signals are used to convey the output of an analogue instrument to a digitiser. While digital signals are relatively tolerant of interference, analogue signals can be disrupted and altered by electromagnetic waves in the environment. This document explains the problem and describes a solution. Read more...
