OPERATION MANUAL - Scintrex

In the case of the CG-5, where the ruggedness of the inherent quartz elementallows us to dispense with clamping between readings, and its universalrange requires no resetting, we avoid the introduction of the hysteresis effectsdue to such causes. On the other hand, we allow the possibility of theirintroduction if the Autograv is left stationary off level, i.e. out of itsmeasuring range, for significant lengths of time.For this reason, it is recommended that whenever the Autograv is not beingtransported between stations, it should be leveled on its tripod so that themass and spring are in their normal configuration. When in transit, hysteresiseffects do not build up to any extent because the bipolar, high frequencychanges in tension on the spring effectively cancel out any tendancy for sucheffects to build up.Figure C-2 - Retardation effect after unclamping LaCoste Romberggravimeter G79, previous clamping time 20 minutes. EFE Hanover (fromGravimetry by Wolfgang Torge, Walter de Gruyter, 1989).HysteresisC-3CG-5 Manual - part # 867700 Revision 2