OPERATION MANUAL - Scintrex

measurements were recorded with the meter using the seismic filter(SEISMIC FILTER < ENABLED). The noise envelope is about 0.7mGal.The bottom trace shows the SD of 1 second samples of the meter with thestandard filter. The SD of the other meter is not much different, as bothmeters see the same disturbing seismic event. Figure B-3 depicts themeasurements taken with a meter using the standard filter, but measuring twotimes longer - DUR = 120 s and Tcycle = 150 s. In spite of that thenoise envelope (over 0. 1 mGal) is larger than the one of the meter usingseismic filter, and measuring two times faster.TheoryFigure B-4 - Comparative data showing the benefitsof the seismic filter.This example shows the superiority of new signal processing. Still, you willnot be able to conduct microgravity survey during such large seismicdisturbances. But there are smaller tremors and ocean storm inducedmicroseismic noise, during which you could obtain good gravitymeasurements, if you select the seismic filter, see Figure B-4. This data wasrecorded in Perth, Australia during a cyclone in the Indian Ocean.B-15CG-5 Manual - part # 867700 Revision 2