Quantity transmission and traceability methods of heavy dc standard measurement device

Ren, Shiyan; Liu, Qingxin; Liu, Xiaojun; Ding, Xinying

doi:10.1049/iet-smt.2014.0066

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…This model describes the way the input quantities form the output quantity. The general form of the latter function is

Y = f false(X_{1}, X_{2}, \dots, X_{N} false) .

According to the literature [5, 15], the combined measurement uncertainty is calculated using

u_{c} ()(, Y) = \sqrt{\sum_{i = 1}^{N} {(\frac{\partial f}{\partial X_{i}})}^{2} u^{2} (X) + 2 \sum_{j = 1}^{N - 1} \sum_{j = i + 1}^{N} \frac{\partial f}{\partial X_{i}} \frac{normal∂ f}{normal∂ X_{j}} u (X_{i}, X_{j})},

where Y is the output quantity;

X_{1}

X_{2}

,…,

X_{N}

are the input quantities; N is the sample size; f is the mathematical model; and

u ()(, X)

is the standard uncertainty of the input values. The expanded measurement uncertainty U is calculated by multiplying the combined measurement uncertainty

u_{c} ()(, y)

by factor k as follows:

U = k u_{c} false(y false) .

The measurement result is then expressed in the form

Y = y \pm U

, which is considered to be the best estimate of the measured quantity Y .…”

Section: Measurement Uncertainty Conceptmentioning

confidence: 99%

Measurement uncertainty of transmission line resistance calculation using ‘Guide to the Expression of Uncertainty in Measurement’ and adaptive Monte–Carlo method

Tolić¹,

Miličević

Tokić

2017

IET Science, Measurement & Technology

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“…This model describes the way the input quantities form the output quantity. The general form of the latter function is

Y = f false(X_{1}, X_{2}, \dots, X_{N} false) .

According to the literature [5, 15], the combined measurement uncertainty is calculated using

u_{c} ()(, Y) = \sqrt{\sum_{i = 1}^{N} {(\frac{\partial f}{\partial X_{i}})}^{2} u^{2} (X) + 2 \sum_{j = 1}^{N - 1} \sum_{j = i + 1}^{N} \frac{\partial f}{\partial X_{i}} \frac{normal∂ f}{normal∂ X_{j}} u (X_{i}, X_{j})},

where Y is the output quantity;

X_{1}

X_{2}

,…,

X_{N}

are the input quantities; N is the sample size; f is the mathematical model; and

u ()(, X)

is the standard uncertainty of the input values. The expanded measurement uncertainty U is calculated by multiplying the combined measurement uncertainty

u_{c} ()(, y)

by factor k as follows:

U = k u_{c} false(y false) .

The measurement result is then expressed in the form

Y = y \pm U

, which is considered to be the best estimate of the measured quantity Y .…”

Section: Measurement Uncertainty Conceptmentioning

confidence: 99%

Measurement uncertainty of transmission line resistance calculation using ‘Guide to the Expression of Uncertainty in Measurement’ and adaptive Monte–Carlo method

Tolić¹,

Miličević

Tokić

2017

IET Science, Measurement & Technology

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“…he current comparators including ac comparators and dc comparators generally possess notable advantages of high accuracy, low drift and high linearity [1][2][3][4][5][6][7][8][9]. However, the increasingly severe external magnetic interference has affected the operational performance of the current comparator greatly in the industrial site.…”

Section: Introductionmentioning

confidence: 99%

Shielding Effectiveness of Double-Layer Magnetic Shield of Current Comparator Under Radial Disturbing Magnetic Field

Ren

Guo

Liu³

et al. 2016

IEEE Trans. Magn.

Self Cite

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The traditional magnetic shield of the current comparator usually adopts the single-layer magnetic shielding structure. However, with the external magnetic interference becoming increasingly severe, the double-layer magnetic shield of the current comparator exhibits greater practical value and favorable application prospects. In order to study the shielding effectiveness of the double-layer magnetic shield of the current comparator, a calculation method about the magnetic shielding effectiveness under the radial disturbing magnetic field is presented. This calculation method is based on the magnetic circuit analysis principle and its accuracy is better than 30%, compared with the corresponding results of finite element method (FEM) simulations. Through analyzing factors affecting the shielding effectiveness, it is approved that a greater shielding effectiveness under the radial disturbing magnetic field is achieved when the thickness of air gaps is approximately equal to that of shielding cores. Besides, when the double-layer magnetic shield has the same external dimension as the single-layer magnetic shield, the radial shielding effectiveness of the double-layer magnetic shield is as two times as that of the single-layer one, while its material consumption is only 6/7 of the latter.Index Terms-Current comparators, finite element method (FEM), magnetic shielding effectiveness, magnetic circuit analysis, radial disturbing magnetic field.

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Remote value transmission and traceability technology of measuring instruments based on wireless communication

Fang

Duan

et al. 2023

Review of Scientific Instruments

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When the traditional calibration methods of measurement instruments are applied, these measurement instruments need to be transmitted to a higher-level validation body for calibration. During transportation, many unknown factors will lead to additional errors that cannot be measured. Remote calibration effectively solves the problems of long calibration cycle and additional error generation. This Review summarizes research achievements made in the field of remote metrology. By comparing the existing remote calibration methods, their advantages and disadvantages are analyzed. Combined with the previous work of the research team, the application scenarios of the future remote value transmission and traceability technology are proposed.

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Quantity transmission and traceability methods of heavy dc standard measurement device

Cited by 4 publications

References 19 publications

Measurement uncertainty of transmission line resistance calculation using ‘Guide to the Expression of Uncertainty in Measurement’ and adaptive Monte–Carlo method

Measurement uncertainty of transmission line resistance calculation using ‘Guide to the Expression of Uncertainty in Measurement’ and adaptive Monte–Carlo method

Shielding Effectiveness of Double-Layer Magnetic Shield of Current Comparator Under Radial Disturbing Magnetic Field

Remote value transmission and traceability technology of measuring instruments based on wireless communication

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