Monitoring the metrological characteristics of measuring instruments of the same type utilizing a group standard

1995 ◽  
Vol 38 (4) ◽  
pp. 366-371
Author(s):  
S. M. Ermishin
Keyword(s):  
Metrological Characteristics ◽  
Measuring Instruments ◽  
Group Standard

Determination of changes of metrological characteristics of measuring instruments with time

1978 ◽  
Vol 21 (2) ◽  
pp. 158-163
Author(s):  
I. V. Abuladze ◽  
A. I. Belyaevskii ◽  
A. A. Dzhevdet
Keyword(s):  
Metrological Characteristics ◽  
Measuring Instruments

Determination of precision conditions for measuring relative values in mechanical tests of various materials

2021 ◽  
pp. 9-17
Author(s):  
Svetlana Yu. Lohanina ◽  
Olga V. Baranova ◽  
Larisa V. Trubacheva
Keyword(s):  
Wear Resistance ◽  
Mechanical Testing ◽  
Mechanical Tests ◽  
Metrological Characteristics ◽  
Measuring Instruments ◽  
Quantitative Chemical Analysis ◽  
Uniformity Of Measurements ◽  
Multi Stage ◽  
Abrasive Disk ◽  
Accuracy Of Measurements

The problem of insufficient detail of the requirements for the developed and certified measurement methods used in mechanical testing of various materials is considered. The compatibility of the requirements of metrological support for the results of quantitative chemical analysis and indirect results of mechanical tests for the wear resistance of materials when rubbing against a fixed abrasive is relevant. To ensure the accuracy of measurements, it is proposed to use the grain size of the abrasive material and the rotation speed of the abrasive disk as variable factors. In order to establish the requirements for the metrological characteristics of materials during mechanical tests, in particular, when determining the relative wear resistance, the conditions for precision measurements are justified. The results of a multi-stage experiment-testing of materials for wear resistance with the use of various research and consumables, measuring instruments and testing equipment are presented. The conditions for the organization of the experiment in the case of determining other relative mechanical characteristics of the materials under study for establishing precision indicators in the development of methods of mechanical tests for abrasive wear are proposed and justified. The application of the obtained results will allow developers of mechanical testing methods to establish metrological characteristics of materials in compliance with all the requirements of the State System for Ensuring the Uniformity of Measurements of the Russian Federation.

scholarly journals Use of statistical analysis methods in processing population survey data

2021 ◽  
pp. 58-60
Author(s):  
Vasilij Kalinchik ◽  
Vitaliy Pobigaylo ◽  
Vitaliy Kalinchyk ◽  
Daniil Filjanin
Keyword(s):  
Total Error ◽  
Current Transformer ◽  
Measuring Channel ◽  
Measuring Circuit ◽  
Metrological Characteristics ◽  
Measuring Instruments ◽  
Voltage Transformer ◽  
Current Transformers ◽  
Collection Device ◽  
Communication Lines

The article analyzes the structures of the measuring channels of electricity metering systems. It is shown that such a structure is determined by the types of measuring instruments used and the scheme of their connection, in particular, by the types of electricity meters installed at the metering points. Moreover, the counters can have a pulse or interface information output. It is shown that the path for measuring and metering electricity includes a measuring circuit consisting of measuring current and voltage transformers, an electricity meter, communication lines, a metering device and a data collection device. The applied method is based on the standardization of the metrological characteristics of individual elements of the measuring path and their synthesis based on the metrological characteristics of the entire electricity metering system. To calculate the total error of the measuring channel, a formula is used that takes into account only the errors of the measuring circuit. It is shown that in recent years there has been a tendency when measuring current transformers and, accordingly, electricity meters operate in the mode of low current loads. In this case, the errors of the elements of the measuring path are poorly studied. The graphs of errors of current transformers depending on load currents are given. It is shown that the values of the errors of current transformers vary with the magnitude of the load current and are in the region of negative values. Therefore, the wrong choice of current transformers can lead to a significant underestimation of electricity. The errors of voltage transformers depend mainly on the load on the secondary winding and do not significantly affect the total error. The resulting error of the measuring path current transformer - voltage transformer - electricity meter in the area of low loads is given. A change in errors in the area of low loads leads to serious metrological losses (underpayment of electricity). In the automation of electricity metering, graphs of changes in errors in the area of low loads are presented, which can serve as a basis for correcting the error of the measuring paths.

scholarly journals Estimation of Factors that Affect the Metrological Characteristics of Target Flow Meters

2020 ◽  
pp. 27-34
Author(s):  
I. V. Korobko ◽  
A. V. Pysarets ◽  
A. M. Rak
Keyword(s):  
Vertical Axis ◽  
Positive Cone ◽  
Metrological Characteristics ◽  
Measuring Instruments ◽  
Flow Meters ◽  
Minimal Impact ◽  
Before And After ◽  
Effective System ◽  
Spatial Configurations ◽  
Abrupt Contraction

The article is devoted to the effective system crea­tion for recording liquids and gases flows. There is extremely relevant for creating metering units of fuel and energy resources. The aim of the work is to determine the influence of the flowed body geometric configuration of the sensitive element and its orientation relative to the direction of the flow on the hydrodynamic flow meter metrological characteristics, as well as determining the instruments’ rational location in the technological line Based on the example of the hydrodynamic class measuring transducers factors that have a significant impact on their metrological characteristics are determined, the degree of the transducers sensitivity to the measured medium flows asymmetry is revealed. The flows asymmetry is simulated by hydraulic resistan­ces of different spatial configurations (spatial elbow, elbow, double elbow, contraction, abrupt contraction). Simulation modeling of the operation of such devices is performed. Sensitive elements of different Gaussian curvatures such as zero (cylinder), positive (cone) and negative (hollow hemisphere) were studied. The value of the registration result uncertainty depends on the flow asymmetry and the instrument spatial orientation relative to the vertical axis in the technological network. The obtained results make it possible to clearly determine the instrument installation place in the technological network under conditions of maximum accuracy and minimal impact on the measured medium. This allows effectively using transducers in places of the technological network, taking into account the specific conditions for the metering units creation. There is no ne­cessary to make straight pipeline sections before and after the instruments. The researches results show that measuring instruments with flow bodies in the shape of a cone oriented the apex toward the flow are the best.

scholarly journals Development of the reference material of nanoporous zeolite

2020 ◽  
Vol 16 (1) ◽  
pp. 25-41
Author(s):  
E. P. Sobina
Keyword(s):  
Reference Material ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Gas Permeability ◽  
Experimental Studies ◽  
Metrological Traceability ◽  
Metrological Characteristics ◽  
Measuring Instruments

The article is devoted to the development of a reference material of the sorption roperties of nanoporous zeolite, which ensures metrological traceability of measurement results to the State primary measurement standard of units for specific gas adsorption, specific surface area, specific pore volume, pore size, open porosity and gas permeability coefficient of solid substances and materials GET 210-2019.The paper presents the results of theoretical and experimental studies on optimizing the conditions of sample preparation (thermal training) of the reference material using the thermogravimetric method and differential scanning calorimetry, coupled with mass spectrometric detection of the evolved gases (TG-DSC–MS analysis). The results of establishing the metrological characteristics of the reference material are described, including standard uncertainty due to the method of determining the certified value, as well as standard uncertainties from heterogeneity and instability. The GSO 10734–2015 reference material of the sorption properties of nanoporous zeolite (Zeolite SO UNIIM) has certified metrological characteristics: specific surface area (500–1200) m2/g; specific pore volume (0.10.5) cm3/g; the predominant pore diameter (0.4–0.9) nm; specific argon adsorption (0.001–20.0) mol/kg.The reference material is designed to calibrate measuring instruments and to control accuracy of results of sorption characteristics of nanoporous materials measurements; it can be used to certify appropriate measurement procedures, to test measuring instruments and reference materials for type approval and other types of metrological control. 

scholarly journals Metrological characteristics for the calibration of surface topography measuring instruments: a review

2020 ◽  
Vol 32 (3) ◽  
pp. 032001
Author(s):  
Richard Leach ◽  
Han Haitjema ◽  
Rong Su ◽  
Adam Thompson
Keyword(s):  
Surface Topography ◽  
Metrological Characteristics ◽  
Measuring Instruments

scholarly journals The new certified reference material of chlorobenzene as a means of providing the metrological traceability for calibration and measurements

2020 ◽  
Vol 16 (1) ◽  
pp. 43-55
Author(s):  
I. Y. Tkachenko ◽  
A. G. Budko ◽  
A. Y. Mikheeva ◽  
A. I. Krylov
Keyword(s):  
Reference Material ◽  
Molar Fraction ◽  
Metrological Traceability ◽  
Metrological Characteristics ◽  
Isotopic Dilution ◽  
Gas Chromatography Mass Spectrometry ◽  
Measuring Instruments ◽  
Primary Measurement ◽  
Measurement Results ◽  
Primary Measurement Standard

The article is devoted to the development of a reference material of chlorobenzene composition, providing metrological traceability of measurement results to the State primary measurement standard of units of mass (molar) fraction and mass (molar) concentration of organic components in liquid and solid substances and materials based on liquid and gas chromatography-mass spectrometry with isotopic dilution and gravimetry GET 208-2014.The paper considers an indirect method for determining the purity of the starting substance, describes the main stages of development of the reference material, and presents the results of the evaluation of the reference material metrological characteristics, including studies on homogeneity and stability.The reference material of the composition of chlorobenzene has the following metrological characteristics: mass fraction of chlorobenzene (from 993.0 to 999.8 mg/g); molar fraction of chlorobenzene (from 99.30% to 99.98%); the expanded uncertainty of the certified characteristics is 0.02% (at k = 2).The reference material ensures metrological traceability to units of measuring instruments and measurement results, and is intended for verification, and calibration and graduations.

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