A method and device for determining a of random or of irregular maes strength free upper wire from the characteristic value a helicoidal guide

摘要

1,256,677. Measuring surface roughness electrically. CARL ZEISS JENA VEB. July 20, 1970, No. 34972/70. Heading G1N. The surface irregularities of a body 2 Fig. 1 are sensed by a stylus 1 and converted by transducer 3 to a voltage signal whose alternate half-cycles are fed to capacitors C 11 , C 12 via switches 8, 9 controlled by a phase-sensitive discriminator 7. In alternate half cycles, the stored signals are transferred to capacitors C 21 , C 22 . A limiter 10 ensures that the maximum voltage change after operation of switches 8, 9 does not exceed an adjustable value U 13 , whereby an excessive irregularity cannot produce a signal greater than U 13 . Each capacitor C 11 , C 12 , C 21 , C 22 may be associated with a resistor to produce a time constant causing the network to reject regularly recurring irregularities. The algebraic sum of the voltages as capacitors C 21 , C 22 , representing the maximum peak-to-valley variation, is indicated on meter 11.