Integrating instruments for quality control

IN QUALITY-CONTROL work, it is often necessary to determine the mean and the standard deviation of an important parameter, such as a dimension of the product. To accomplish this, a measurement system called an Evenness Integrator, Figure 1, has been developed for applications in which the material is tested while moving continuously. Since most of the necessary calculating functions are performed by two new integrating instruments, the equipment eliminates virtually all of the laborious data-taking and the computations ordinarily associated with the statistical analysis of a large number of discrete measurements.