For their calibration, the standard capacitor uncertainty must be four times lower. To get this uncertainty value, their voltage dependence must be deter-mined because it can be higher than that the limit, in some units. All high precision capacitors, used at high voltage, are of gas insulated cylindrical coaxial type. In the past, different constructions were proposed, with other …
III. RESULTS The Type-B uncertainty component for the error due to frequency dependence has been reduced by an order of magnitude from 0.7×10-6 to 0.06×10-6. Therefore, the overall expanded uncertainty (k = 2) for 1 kHz calibration of 10 pF and 100 pF fused-silica capacitors has been reduced from 1.5 ́10-6 to 0.5 ́10-6.
Table 16. Combined standard uncertainty of scaling ratio for 10 nF capacitor, in parts in 106. (*) The asterisk indicates a measurement using 4TP air capacitors and its capacitance is obtained from measurement at 1 kHz and extrapolation to 100 kHz. The uncertainty of the measurement procedure is 13 parts in 106.
(40) In order to find the uncertainty of the 10 nF capacitor, the uncertainty of the scaling ratio, K, must be determined. The scaling ratio is measured using the equation 1 nF_ CB 100 pF_ LCR .
Where appropriate, both Type A and Type B uncertainty components are considered. The capacitance scaling method uses ceramic capacitors with temperature coefficients on the order of 35 parts in 106 per °C (values 10 nF, 100 nF, 1 μF and 10 μF).
Expanded uncertainty (k=2) for 10 pF 3T nitrogen gas standard capacitor calibration. List of Tables Table 1. Frequency dependence for NIST 100 pF, 10 pF, and 1 pF reference fused-silica standard capacitors.
Note that the Type B uncertainty of the capacitance meter has been approximated conservatively at 10 ppm. III. NETWORK ANALYZER MEASUREMENT UNCERTAINTY
For their calibration, the standard capacitor uncertainty must be four times lower. To get this uncertainty value, their voltage dependence must be deter-mined because it can be higher than that the limit, in some units. All high precision capacitors, used at high voltage, are of gas insulated cylindrical coaxial type. In the past, different constructions were proposed, with other …
assessment of tested equipments when using standard capacitors. It is presented: a review on standard capacitor typical behavior and the description of an experiment for reduction the contribution on uncertainty. Keywords: standard capacitor, high-voltage test, metrological reliability. 1. INTRODUCTION
This document presents the analysis of error sources that contribute to the total uncertainty of capacitance calibrations at the National Institute of Standards and Technology …
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Combined standard uncertainty of 100 μF capacitor dissipation factor, in μrad. ……………………………………………………………………………………37 Table 43.
Standards and Technology (NIST, formerly NBS) has developed the capability to characterize capacitance and dissipation factor for four terminal-pair (4TP) air dielectric capacitors at frequencies from 1 kHz to 10 MHz. The method, based on work by Cutkosy and Jones of NBS and recent developments by Hewlett-Packard Japan,
Abstract – Uncertainties for 1 kHz capacitance calibrations have been decreased at the National Institute of Standards and Tech-nology (NIST). The improvements are based on frequency-dependence characterization from 1592 Hz to 1000 Hz.
standard using a 0.5 pF toroidal cross capacitor, C 0.5, with an estimated uncertainty of 0.02×10-6 at 1592 Hz. So and Shields [4] used a variable parallel-plate guard-ring capacitor as the reference for dissipation factor measurements, achieving uncertainties as low as 0.01×10-6 at 1592 Hz. Absolute determinations of the
Table II labels the standard uncertainty components, and Table III shows the values of the components as well as the expanded standard uncertainties for capacitance and dissipation factor characterization of the standard 4TP capacitors (1, 10, 100, and 1000 pF) at frequencies of 1 and 10 MHz. The uncer-tainty components are root-sum-squared and then multiplied by two to …
expanded standard uncertainties for capacitance and dissipation factor characterization of the standard 4TP capacitors (1 pF, 10 pF, 100 pF, and 1000 pF) at frequencies of 1 MHz and 10 MHz. The uncertainty components are root-sum-
Abstract – Uncertainties for 1 kHz capacitance calibrations have been decreased at the National Institute of Standards and Tech-nology (NIST). The improvements are based on frequency …
Table 2 labels the standard uncertainty components and Table 3 shows the values of the components as well as the expanded standard uncertainties for capacitance and dissipation factor characterization of the standard 4TP capacitors (10 pF, 100 pF, and 1000 pF) at frequencies of 1 MHz and 10 MHz. The uncertainty components are
Uncertainty budget for NIST 100 pF nitrogen gas standard capacitors. Table 7. Uncertainty budget for NIST 10 pF nitrogen gas standard capacitors. iii . 1. INTRODUCTION . We have recently made improvements in capacitance measurements by expanding the frequency range of and lowering the uncertainty assigned to three-terminal (3T) fused-silica and nitrogen …
Standards and Technology (NIST, formerly NBS) has developed the capability to characterize capacitance and dissipation factor for four terminal-pair (4TP) air dielectric capacitors at …
expanded standard uncertainties for capacitance and dissipation factor characterization of the standard 4TP capacitors (1 pF, 10 pF, 100 pF, and 1000 pF) at frequencies of 1 MHz and 10 …
Table 2 labels the standard uncertainty components and Table 3 shows the values of the components as well as the expanded standard uncertainties for capacitance and dissipation …
A Few Symbols. A propagation of uncertainty allows us to estimate the uncertainty in a result from the uncertainties in the measurements used to calculate that result. For the equations in this section we represent the result with the symbol R, and we represent the measurements with the symbols A, B, and C.The corresponding uncertainties are u R, u A, u …
Commer~ial four-terminal pair standard air capacitors were used for these measurements. The values of the capacitors were 1 pF, 10 pF, 100 pF, and 1000 pF. Measurements at 1 kHz Each capacitance measurement result is an average of 20 measurements taken in one day. The voltage levels for the 1 pF, 10 pF, 100 pF, and 1000 pF capacitor measurements are 15 V, 15 …
The traveling standard for the SIM.EM-K4.1 comparison was an Andeen-Hagerling AH11A 10 pF fused-silica standard capacitor, with serial number 01688. The traveling standard for the SIM.EM-S4.1 comparison was an Andeen-Hagerling AH11A 100 pF fused-silica standard capacitor with serial number 01689. Both the traveling standards were housed in the ...
reference standard capacitors used were a 1 pF cross capacitor, chosen for its negligible frequency dependence at low frequencies, and a 10 pF nitrogen gas capacitor chosen because it has good reference characteristics at higher frequencies [2].
Abstract: This article proposes and implements actions for guarantee of metrological reliability and safe conformity assessment of tested equipments when using standard capacitors. It is presented: a review on standard capacitor typical behavior and the description of an experiment for reduction the contribution on uncertainty.
ListofTables Page Table1 DialCorrectionsoftheType-2Bridge 40 Table2. StandardUncertaintiesinDialCorrectionsoftheType-2Bridge 41 Table3 ...
reference standard capacitors used were a 1 pF cross capacitor, chosen for its negligible frequency dependence at low frequencies, and a 10 pF nitrogen gas capacitor …
Abstract: This article proposes and implements actions for guarantee of metrological reliability and safe conformity assessment of tested equipments when using standard capacitors. It is …
calculable capacitor standard. It is also assumed that the participating institute has an adequate measurement chain allowing it to measure the absolute 10 pF key capacitance value with a relative standard uncertainty below or equal to 10 parts in 108.
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This document presents the analysis of error sources that contribute to the total uncertainty of capacitance calibrations at the National Institute of Standards and Technology (NIST). Based on considerations of the measuring systems and calibration procedures, and data taken on NIST working and check standards and customer''s standards ...
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