Accurate transfer function determination for superconducting gravimeters

The transfer function for the cryogenic gravimeter GWR-C021 operating at Me mbach (Belgium) has been experimentally determined by injecting known volta ges into the: control electronics of the system. The output of the gravimet er to the injected sine waves and step functions has been observed. This gi ve a precise knowledge of the transfer function of the gravimeter. It allow s one to reach a precision:of:better than 0.01 second in the phase response of the instrument, in agreement with the Global Geodynamics Project (GGP) requirements.