ASTM E 1942 : 1998(R2018)

CONTAINED IN VOL. 03.01, 2015 Defines how to understand and minimize the errors associated with data acquisition in fatigue and fracture mechanics testing equipment.

1.1 This guide covers how to understand and minimize theerrors associated with data acquisition in fatigue and fracturemechanics testing equipment. This guide is not intended to beused instead of certified traceable calibration or verification ofdata acquisition systems when such certification is required. Itdoes not cover static load verification, for which the user isreferred to the current revision of Practices E4, or staticextensometer verification, for which the user is referred to thecurrent revision of Practice E83. The user is also referred toPractice E467.1.2 The output of the fatigue and fracture mechanics dataacquisition systems described in this guide is essentially astream of digital data. Such digital data may be considered tobe divided into two types– Basic Data, which are a sequence ofdigital samples of an equivalent analog waveform representingthe output of transducers connected to the specimen under test,and Derived Data, which are digital values obtained from theBasic Data by application of appropriate computational algorithms.The purpose of this guide is to provide methods thatgive confidence that such Basic and Derived Data describe theproperties of the material adequately. It does this by settingminimum or maximum targets for key system parameters,suggesting how to measure these parameters if their actualvalues are not known.1.3 This international standard was developed in accordancewith internationally recognized principles on standardizationestablished in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendationsissued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.