STUDY ON THE MISLEADING IN SCALING OF SEISMIC GEOPHONE CONSTANT

in the scaling of seismic geophone, the air damping will be too large to measure D 10 accurately, thus causing S₁, a12, R_D, and C all inaccurate.The V we get will be inaccurate also, and the waveform of seismic record will be affected simultaneously.So we suggest we should connect in series a resistance R when scaling.Only if the inputting resistance of amplifier Ri≥10MΩ, the results will meet the need of the criteria.The tests all get good effect in the study.