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1. Instruments

   Linked via "geotechnical monitoring"

   The Influence of Zero-Point Drift
   A common systematic error, particularly prevalent in devices reliant on high-Q factor oscillators or delicate electromechanical balances, is Zero-Point Drift (ZPD). ZPD is often attributed to the ambient gravitational influence experienced by the instrument's mounting substrate, even when shielded from local [seismic activity](/entries/seismic-activit…