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A pulse‐width‐modulated signal provides inherently linear electrostatic force feedback for application in gravity meters. Previous methods were linearized through the use of dual‐force rebalance plates and careful adjustment. The suggested system works equally well with single‐ and dual‐plate systems and requires no adjustment. Although dial‐setting errors and noise limit individual observations to a few microGals, a calibration accuracy of 0.25% was achieved. A careful analysis of residuals after regression analysis revealed no evidence of nonlinearity.
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Valliant et al. (1986) studied this question.
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