Abstract: A metrological instrument includes an inductive transducer having a stylus, all being disposed within a protective housing. Upon initiation of the measuring operation, the transducer is moved so that the stylus moves round an endless path such that the stylus is first projected at a high speed from the housing, is thereafter moved to engage the workpiece surface, is then moved at relatively slow speed across the workpiece surface for performing the measurements, and, following completion of the latter movement, is retracted at a high speed into the housing. These movements are effected by a series of cams driven by a single motor. Such an instrument may be located next to a production line without risk of damage and may used for the checking of each of a multiplicity of identical components produced in a mass production process.

Abstract: In this system for detecting errors in data handled on a bus in a biphase format in accordance with a certain bus protocol, a pair of signals are established. The digitally measured time durations of these signals accurately represent the respective positive and negative excursion times of the bus data. Certain analyzers detect errors digitally in response to these measured time durations. Each analyzer means includes a half sync detection means for ascertaining that the time duration of each of these signals corresponds to the expected time duration of half of an initial sync signal transmitted in conformance with the bus protocol. A valid sync detector ascertains the consecutive occurrence of valid half sync signals from each analyzer, and provides a valid sync detected signal, and indicates sync type.