Calibration Of Electrical Resistance Strain Gauges- Engineering Lab Training Systems

Features Cost, effective Self-contained Calibration of strain gauges to Determination of gauge factor Introduction to calibration and standards Introduction to probability of production errors of batch made strain gauges Three year warranty Range of Experiments To study the application of structural theory in strain gauge calibration To asses the accuracy of calibration techniques To introduce the application of probability theory in production quality control Description Based on BSI Draft for development 6:1972 this gauge factor test rig is a precision item specially designed for measuring the gauge factor of an electrical resistance strain gauge. It also demonstrates how structural theory is used to determine the strain on the surface of a test bar for calibration purposes. The apparatus is based on a four point loading system which produces circular bending in the center section of a precision ground steel beam. A device for measuring the curvature over a length of 300mm has been calibrated to give direct readings of strain up to 1000 micro stain. For demonstration purposes a pair of electrical resistance gauges have been bonded to the beam, but for calibration work users will bond their own gauges in accordance with DD6/1972. An extension from the normal technical experiment is to introduce students to probability theory to assess likely differences in gauge factor due to batch manufacture. This equipment is part of a range designed to both demonstrate and experimentally confirm basic engineering principles. Great care has been given to each item so as to provide wide experimental scope without unduly complicating or compromising the design. Each piece of apparatus is self-contained and compact. Setting up time is minimal, and all measurements are made with the simplest possible instrumentation, so that the student involvement is purely with the engineering principles being taught. A complete instruction manual is provided describing the apparatus, its application, experimental procedure and typical test results.