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- W2587803400 abstract "The systematic effects of absolute gravimeters have to be investigated to fully utilize their capabilities in metrology and geosciences. In Křen et al (2016 Metrologia 53 27–40) we found that for an FG5 gravimeter, even a few meter long coaxial cable used for transmission of fringe signal causes systematic features in residuals and errors at the level of 1–2 µGal. In this paper, we present experimental results and appropriate models to explain the effects that were found to be caused by impedance mismatches of electronic components and dispersion effects in coaxial cables of gravimeters. The experimental results have been obtained for analogue and transistor–transistor logic (TTL) compatible signals in the FG5-215 gravimeter and for a TTL signal in the FG5X-251 gravimeter. We found that dispersion and impedance mismatch effects are similar for both gravimeters. Furthermore, we describe a model of the dispersion that allows an evaluation of the effect/correction for a given range of the free-fall and thus it is also applicable to other gravimeters. The effect of impedance mismatch for the analogue fringe signal is modelled as an effect of the reflected electronic signal on the evaluation of zero-crossings. The applicability of this model for TTL signal is also discussed." @default.
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- W2587803400 date "2017-02-15" @default.
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- W2587803400 title "Effects of impedance mismatch and coaxial cable length on absolute gravimeters" @default.
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- W2587803400 doi "https://doi.org/10.1088/1681-7575/aa5ba1" @default.
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