Uncertainty of Measurement
To best try to explain what Uncertainty of Measurement is, let us consider a simple task. Imagine measuring the length of a piece of string. If we gave our piece of string to a group of 10 people and asked them to measure it we would most likely receive 10 different answers. The reason for this would be due to Sources of Uncertainty. This could include:
- Straightness of the string
- End flatness of string (raggedness of the end fibers)
- Tension of the string
- Humidity affecting the string
- Temperature affecting the string
- Resolution of the ruler (the smallest division on the ruler)
- Correctness of the ruler (how perfect was the ruler when it was calibrated)
- Correctness of measurement of the master device used to calibrate the ruler
- How many readings taken to determine the measurement length
- Repeatability of the measurements
As you can now see the environment, method, and equipment all contribute opportunities for variations and doubt. And we have to conclude that:
- Nothing is CERTAIN in measurement
- The only certainty is that any measurement will not be perfectly exact
Quantifying the Uncertainty of a Measurement can be a complicated, but methodical task. The International Standards Organisation (ISO) has produced a document called The Guide to the Uncertainty of Measurement (GUM), which provides internationally recognized methods for determination of Uncertainty Budgets and associated calculations. More recently, many ISO and ASTM standards also include appendices detailing how to work out uncertainty of measurement. Because measurement variation is a major contribution in any Uncertainty Budget, probability as well as size of variation has to be defined when expressing Uncertainty of Measurement.
Serie 3400: soluciones de ensayo asequibles
Sistemas de ensayo universales Serie 3400 de Instron para ensayos de tracción, compresión, doblado y otros materiales.
Catálogo de sistemas de ensayo Serie 6800 Premier
Los sistemas de ensayo universales Serie 6800 de Instron proporcionan una precisión y fiabilidad sin igual. Construida sobre una arquitectura de sistema Operator Protect pendiente de patente, con un kit Smart-Close totalmente nuevo y funciones de mitigación de colisiones, la Serie 6800 hace que los ensayos de materiales sean más sencillos, limpios y seguros que nunca.
Catálogo de Bluehill Universal
El software Bluehill Universal está diseñado desde el principio para una interacción táctil y una experiencia de usuario intuitiva. Descubre ensayos más sencillos y limpios con funciones como métodos de ensayo precargados, QuickTest en segundos, exportación de datos mejorada e Instron Connect, una nueva función que proporciona un enlace de comunicación directa con el servicio. Los usuarios de versiones anteriores del software, como Bluehill 2 y Bluehill 3, pueden actualizarse fácilmente a la última versión de Bluehill.
