It is well known that purely electrical circuit equivalents exist for electromechanical seismometers, and that they are useful for the analysis of the performance of such instruments. This paper calls attention to the advantages obtained by representing ground-motion and related quantities as current sources rather than voltage sources which have been usually used. The use of current sources in many instances preserves the symmetry inherent in the mechanical resonant system and results in substantial simplifications in some analysis procedures.

Two particular studies are described, a quantitative investigation of the effect of the approximations in the application of the Maxwell impedance bridge to seismometer calibration, and the evaluation of the fundamental instrument noise of a seismometer.

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