Abstract: A position-measuring system in which an improved digital to analog converter accepts an error signal from a position measuring transducer, the error signal being processed to be a digital signal representation of the magnitude and two-state direction of a positional error. The system is constructed to operate as if the error signal input had three states, two directional states and an intermediate "dead zone.

Abstract: Two embodiments of an electronic measuring gage are disclosed, each suitable for the visual display of a workpiece dimension. A grinder gage of one embodiment has a single movable measuring probe with both coarse and fine travel components. The measuring probe is mounted on an inner coaxial shaft which is fitted within a sleeve-like outer coaxial shaft. The outer coaxial shaft is slidably mounted in the grinder gage housing for coarse travel and carries the inner shaft and measuring probe with it. The inner shaft is adapted for fine travel relative to the outer shaft, and resilient connection means are provided for connecting the two shafts. One element of an Inductosyn position-measuring transducer is fixed to the inner coaxial shaft and the other element is fixed to the grinder gage housing. A base probe and a positioning probe are also mounted in the housing to maintain the measuring probe and base probe colinear with a diameter of a round workpiece to be measured.

Abstract: Two relatively movable, spaced elements having electrostatically coupled sets of uniformly spaced interdigitated electrodes form a precision, high gain linear or angular position-measuring transducer. Coupling electrodes on one element capacitively couple to portions of the electrodes on the other element so that electrical connections to external excitation and detection circuitry need be made to only one of the two elements. The shape and dimensions of the electrodes can be arranged to reduce or eliminate undesired impedance variations, capacitive coupling and unwanted harmonic coupling wave frequency components.