Standard infralow-frequency vibration system

Precision test systems working in the range 0.01-20 Hz are required to determine the metrological characteristics of seismic equipment used in seismic observations and in research on the earth's physical properties. An experimental seismometric test system (STS) has been built to produce sinusoidal oscillations in the horizontal plane in the range 0.01-20 Hz with amplitudes of 0.1-20 mm for instruments of mass up to 25 kg. The apparatus contains a computer and the programmable GZ-110 oscillator, which provide good scope for automating the processing and specifying the working modes in checking equipment with high accuracy and throughput. The STS enables one to record the frequency response, the phase response, and the amplitude characteristics for means of measuring the parameters of infralow-frequency vibrations, as well as to determine the conversion factors for seismic detectors and the metrological parameters of instruments.