Standards of Measurement:
- Primary Standards (Master Standards): The primary standard is also known as Master Standard, and is preserved under the most careful conditions.
- Secondary Standards (Calibration Standards): The secondary standard is more or less similar to the primary standard. They are nearly close in accuracy with primary standards.
- Tertiary Standards (Inspection Standards): The Tertiary standard is the first standard to be used for reference purpose in workshops and laboratories.
- Working Standards (Workshop Measuring Standards): The working standard is used for actual measurement in workshop or laboratories by the workers. ...
What does standard of measurement mean?
to measure variability. It enables one to arrive at an estimation of what the standard deviation of a given sample is. It is commonly known by its abbreviated form – SE. SE is used to estimate the efficiency, accuracy, and consistency of a sample.
What is the standard method of measurement?
Standard Method of Measurement (SMM) is a reference document used to determine a localized technique of construction measurement protocol needed in producing a good Bills of Quantities (BQ) which is then incorporated into the contract document for the project.
What are standard 2x4 lengths?
What Are the Standard Lengths for Dimensional Lumber?
- Wall Studs. The most common dimensions of wall studs are 2-by-6 and 2-by-4. ...
- Common Lengths for Wall Construction. When using studs, other dimensions of 2-by-4 and 2-by-6 lumber is used. ...
- Floor Joists. Floor framing requires 2-by-8, 2-by-10 or larger dimensional lumber. ...
- Special Lengths. ...
What does standard measure mean?
Standard deviation is a measure of dispersion, telling us about the variability of values in a data set. Compare this to the mean, which is a measure of central tendency, telling us where the average value lies. Standard deviation tells us how far, on average, each data point is from the mean:
What are different standards of measurement?
On the basis of the accuracy of measurement, the standard can be classified into two categories, viz. Primary standard and Secondary standard. The meter is considered as one of the fundamental units upon which, through appropriate conversion factors, the other systems of length are based.
What are standards of measurement necessary?
A measurement standard is a quantity that people agree to use as a comparison. Standards are important because they allow measurements to be compared even if different people in different parts of the world take them.
What are the two standards of measurement?
The two systems used for specifying units of measure are the English and metric systems.
What are the examples of standard units?
Standard units are what we usually used to measure things like weight, length and volume. Standard units that would be introduced in primary school are grams, kilograms, meters, kilometres, millilitres and litres.
What is modern measurement?
Modern measurements are defined in relationship to internationally standardized reference objects, which are used under carefully controlled laboratory conditions to define the units of length, mass, electrical potential, and other physical quantities.
What is a standard in science?
In metrology (the science of measurement), a standard (or etalon) is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity. Standards are the fundamental reference for a system of weights and measures, against which all other measuring devices are compared.
What is a secondary standard?
Secondary standards are calibrated with reference to a primary standard. The third level of standard, a standard which is periodically calibrated against a secondary standard, is known as a working standard. Working standards are used for the calibration of commercial and industrial measurement equipment.
What is the standard of a kilogram?
Standard (metrology) The international prototype of the kilogram (IPK) is an artefact or prototype that was defined to have a mass of exactly one kilogram. In metrology (the science of measurement), a standard (or etalon) is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity.
Why are laboratory standards called secondary standards?
Sometimes they are (incorrectly) called "secondary standards" because of their high quality and reference suitability.
What is a working standard?
Working standards. A machine shop will have physical working standards ( gauge blocks for example) that are used for checking its measuring instruments. Working standards and certified reference materials used in commerce and industry have a traceable relationship to the secondary and primary standards.
What are the advantages of eliminating artifact standards?
One advantage of elimination of artifact standards is that inter-comparison of artifacts is no longer required. Another advantage would be that the loss or damage of the artifact standards would not disrupt the system of measures. The next quality standard in the hierarchy is known as a secondary standard. Secondary standards are calibrated ...
Assessment
- Conformity Assessment is the demonstration that specified requirements relating to a product, process, system, person or body are fulfilled. Conformity assessment can include: supplier's declaration of conformity, sampling and testing, inspection, certification, management system a…
Scope
- Documentary Standards can specify definition of terms; classifications of components; delineation of procedures; specification of dimensions, materials, processes, products, systems, services or practices; test methods and sampling procedures; or descriptions of fit and measurements of size or strength. Under the National Technology Transfer and Advancement A…
Accreditation
- The National Voluntary Laboratory Accreditation Program (NVLAP) provides third-party accreditation to testing and calibration laboratories in response to legislative actions or requests from government agencies or private-sector organizations. NVLAP-accredited laboratories are assessed against the management and technical requirements published in the International St…
Resources
- For more than 50 years, NIST has developed and distributed Standard Reference Data. Search the NIST Data Gateway and view our list of more than 70 NIST web sites dedicated to Standard Reference Data. Standards.gov is your pathway to standards solutions. Maintained by the NIST Standards Coordination Office this website provide tools, programs, services and educational re…
Functions
- NIST has developed an organizational policy on metrological traceability and a set of related supplementary materials, which includes answers to questions frequently asked by customers of NIST measurement services. NIST is responsible for developing, maintaining and disseminating national standards - realizations of the SI - for the basic measurement quantities, and for many d…
Mission
- Our mission is to improve the accuracy of measurements, enhance consumer protection, foster fair competition, and facilitate economic growth and trade through technical activities that promote uniformity in national and international legal metrology laws, regulations, standards, test procedures, and enforcement.