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...
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...
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...