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The standard uncertainty evaluation is very important in instrumentation and measurement industry because it is used to communicate, compare and combine uncertainty generated by various components in a system. The analytical evaluation of uncertainty has been recognized to be important and carries many advantages from theoretical perspective. Due to perceived complexity and feasibility of mathematical...
Digital Stochastic Measurement (DSM) method provides Fourier coefficients by using dithered samples of the measured signal. In this paper we evaluate the uncertainty bounds of this method, and compare our results with the Cramer-Rao Lower Bound findings.
Against the tradition, which has considered measurement able to produce pure data on physical systems, the unavoidable role played by the modeling activity in measurement is increasingly acknowledged, particularly with respect to the evaluation of measurement uncertainty. This paper characterizes measurement as a knowledge-based process and proposes a framework to understand the function of models...
It is impractical to measure the INL (Integral Non-Linearity) of a high resolution precision source to tight specifications with the requisite accuracy (0.00008%) at all possible source values. A method is described that was used to guarantee the accuracy of a precision source with a resolution of 24 bits, in a timely fashion. Experimental results from testing multiple instruments are described.
A Measurement System Analysis, abbreviated MSA, is a specially designed experiment that seeks to identify the components of variation in the measurement. Just as processes that produce a product may vary, the process of obtaining measurements and data may have variation and produce defects. A Measurement Systems Analysis evaluates the test method, measuring instruments, and the entire process of obtaining...
Accurate measurement of distorted, noisy and pulsed currents is still a challenge. Current transformers introduce unacceptable errors in magnitude and/or phase shift. Rogowski coils are useful for clamp-on field measurements, but can be cumbersome to use. This paper presents a transducer consisting of coreless transformer and a non-integrating electronic amplifier. Calibration of two prototype transducers,...
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