The gear train uses an antibacklash precision gear to assure full accuracy over the entire range. Thus the coarse resolver makes one revolution for 64 or 128 turns of the fine resolver. The coarse resolver counts the number of turns, while the fine resolver keeps track of the position in the last revolution and the two signals combined give absolute linear position over multiple revolutions. As shown in the diagram, the coarse and fine resolver rotor windings are excited from a common reference sinusoidal generator. The resolver analog output signals from the stator windings, after signal conditioning in the buffer amplifiers, are decoded to digital format in two independent Ratiometric Tracking Converters. The digital information from coarse (i.e., number of revolutions) and fine (i.e., position in the last revolution) resolvers is then superim-posed in the coarse-fine alignment circuitry to determine the actual absolute position. The zero offset set by the front panel thumbwheels is continuously added to this value and the resultant position is, displayed on the front panel display. The position information is also made available in a parallel format for external devices such as PLC's remote displays etc.

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