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OPERATION MANUAL - Scintrex

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Compensation and Corrections(16% increase over the amplitude of gravimetric tides of the rigid Earth).Slight variances of gravimetric factor exist. The gravimetric factor is latitudedependent and different tidal waves have slightly different factors. This mayresult in minor residuals of a semi-diurnal and diurnal nature havingamplitudes of about ±3 uGals.In addition, the ocean tides, besides their direct gravitation, cause additionaldeformation by their loading. These deformations lead to additional changesof the gravity values observed on the surface of the Earth. The residuals fromboth effects could be effectively removed from field measurements by usinganother gravity meter as a base-station (Figure B-5).Gravity Offset (GREF)This value is in mGal and entered from the keypad. It is added to eachreading sample.TheoryFigure B-5 - Continuous measurement over ten daysshowing the linear nature of drift together with otherphenomena, such as ocean loading tide.B-21CG-5 Manual - part # 867700 Revision 2

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