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{{#category_index:R|ramp}} 1. To change in a continuous manner from one set of parameters to another, as opposed to an abrupt step. Usually implies in a linear manner; e.g., the change between filter parameters for the early portion of a seismic record and those for the later portion may be ‘‘ramped’’ or distributed uniformly over an intervening transition portion. The amplitude of a vibroseis sweep may increase gradually from zero to an amplitude that is then held constant during most of the sweep. 2. A method of tapering a data window; see Figure W-12. 3. Tilting the instrument platform between horizontal and vertical to measure the cross-coupling in testing shipboard gravimeters. 4. The running integral of a unit step; a triangular function. 5. Ramp time is the time required for an electromagnetic transmitter to go from one constant-current state to another.