OPERATION MANUAL - Scintrex

Re-Calibrating the CG-5greatest precision, in particular for regional surveys, may wish to recalibratetheir gravimeters. This could be done in a similar way as it was done initiallyat Scintrex.In order to derive the new GCAL1 at least two locally available stations withthe reliably determined gravity difference of at least 100 mGal are necessaryAdditional intermediate well determined gravity stations will serve toincrease the precision of this determination. By looping back to the startingstation the residual drift should be determined, and used for correction ofreadings at other stations. Beware that some older calibration ranges wereestablished by using LaCoste-Romberg gravimeters before the existence ofcyclic measurement screw errors was known and the corrections for itapplied, and that therefore they may not be very accurate.Maintenance5-33CG-5 Manual - part # 867700 Revision 2