OPERATION MANUAL - Scintrex

Adjusting Instrument ParametersObtaining Accurate ResultsThe following provides a few guidelines for obtaining best results with yourCG-5:• The drift correction should not be adjusted on the basis of repeatmeasurements at base stations during a field survey, but rather with driftmeasurements obtained from a stationary instrument. The drift correctionfeature corrects for relatively constant long term instrument drift due tostress relaxation in the elastic system.• There may be a small amount of additional drift induced by transportationand handling. The drift correction is not intended to eliminate drift due totransportation as it is generally not constant and depends on the conditions oftransportation. This residual drift can be determined by repeatedmeasurements at selected base stations.• Ensure that the tide correction is selected and properly adjusted whilemeasuring the drift correction.• To obtain the most accurate estimate of instrument drift, dump the data andprocess it with an appropriate data processing package or program.MaintenanceAutomated Drift Adjustment SoftwareThe CG-5 provides a software-based automated method to determine thedrift constant and update the internal correction information automatically.This method provides a convenient way to determine the drift constant whichis accurate for most applications. For the highest accuracy dump the data andprocess it offline.Enabling the Drift Constant RoutineFirst set the instrument up on the tripod on a stablesurface in a quiet location.Access the Service menu. The system displays theSERVICE MENU screen.Press the arrows to select the User Calibrationoption.5-11CG-5 Manual - part # 867700 Revision 2