Both methods were validated concerning their specificity, linearity, limits of detection and quantification, precision, accuracy and stability.
Recommended practices for calibration laboratories Recommended practices for calibration laboratories June 1. The recommendations are not necessarily requirements for accreditation into the Canadian Calibration Network. Test Uncertainty Ratio TUR The ratio of the tolerance limit s of the object being measured to the uncertainty of the measurement system.
Calibration The set of operations that establishes, under specified conditions, the Stp analysis of lux shop between values of quantities indicated by a measuring instrument or measuring system, or values represented by a material measure or a reference material, and the corresponding values realized by standards.
The result of a calibration permits either the assignment of values of measurands to the indications or the determination of corrections with respect to indications. A calibration may also determine other metrological properties such as the effect of other influence quantities.
The result of a calibration may be recorded in a document, sometimes called a calibration certificate or a calibration report. Calibration Laboratory Laboratory that performs calibration.
A calibration laboratory may offer one or more of the following types of service. A service that is intended primarily for the calibration of measurement standards. A service that is intended primarily for the calibration and adjustment of test, measurement, and diagnostic equipment for use in such areas as product testing, manufacturing, and servicing.
The service is the same as Type II service except that the laboratory does not have the means to verify directly its measurement standards using redundant equipment. The laboratory instead assures the quality of the measurement results through such other quality control techniques as interlaboratory comparison, replication, retesting, and correlation with other measurement characteristics.
A mobile laboratory can offer any type of service as long as it meets the appropriate criteria. Some laboratories may offer more than one type of service. Designated Measurement Standards These include: National standards held or accepted by the National Research Council of Canada.
National standards of other countries whose measurement results are correlated with international standards through the BIPM Bureau international des poids et mesures or with Canadian national standards.
Accepted values of natural physical constants. Ratio type of self-calibration techniques. Certified standard reference materials. When calibrations are traced to foreign standards, differences between the nationally-adopted measurement unit values and the Canadian values must be taken into consideration, when warranted.
A consensus measurement standard is an artifact or process that is used as a de facto standard by agreement between contracting parties when no national measurement standard is available. A reference material is a material or substance, one or more of whose properties are sufficiently homogeneous and well established to be used for the calibration of an apparatus, the assessment of a measurement method, or for assigning values to materials.
A certified reference material sometimes referred to as a standard reference material is a reference material, accompanied by a certificate, one or more of whose property values are certified by a procedure which establishes traceability to an accurate realization of the unit in which the property values are expressed, and for which each certified value is accompanied by an uncertainty at a stated level of confidence.
Measurement Standard A material measure, measuring instrument, reference material, or measuring system intended to define, realize, conserve, or reproduce a unit or one or more values of a quantity to serve as a reference.
National Metrology Institute NMI A facility that realizes, maintains, and disseminates the primary measurement standards in a country also referred to as National Measurement Standards.
Primary Measurement Standard A standard that is designated or widely acknowledged as having the highest metrological qualities and whose value is accepted without reference to other standards of the same quantity. Traceability the property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties.
CLAS requires that all laboratories in the traceability chain be verified e. Transfer Standard A standard used as an intermediary to compare standards.
The term transfer device should be used when the intermediary is not a standard; e. Travelling Measurement Standard A standard, sometimes of special construction, intended for transport between different locations; e.
Uncertainty of measurement A parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand. In the case of compliance testing, the uncertainty of measurement can be inferred from the test uncertainty ratio TUR.
Uncertainty List An itemized list of the sources and magnitudes of the uncertainties that contribute to the total uncertainty attributed to any measurement result.Safety Data Sheet (SDS) Search. In March , the Hazard Communication Standard was revised to align with the The Globally Harmonized System of Classification and Labelling of Chemicals (GHS).
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