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≡Technical Background 10Directly AppliedNoise Force F NIsolated Payload (M)PayloadMotionXpSpring(k)Damper (b)MEarth2GroundMotionXeX pX eT ≡ =(1 +1 – ω2((2 +ω 02ωQω 0ω((2 2Qω 0(SeismometerTest Mass X 1+Pos. Filter Sum++Isolated Payload X 2 Sum+FeedforwardInputFilterInput+Sum-(GOutputK sForceEarthGroundMotionSensorHUnstableHBorderlineStableCOMTwo-ChamberIsolatorsWwww.techmfg.com • 978-532-6330 • 800-542-9725 (Toll Free) • Fax: 978-531-8682 • sales@techmfg.com91