Methods, apparatus, and procedures for the comparison of precision standard resistors

Wenner, Frank

doi:10.6028/jres.025.031

Cited by 33 publications

(7 citation statements)

References 16 publications

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“…Early autotransformer bridges were described in [24,25]. These bridges have been widely used up to now [15,16].…”

Section: Autotransformer Bridge: Description and Analysismentioning

confidence: 99%

Variational Calibration

Surdu¹

2018

Metrology

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The approach to the improving the accuracy of the impedance parameter measurements is described. This approach is based on the well-known variations of the influence of the disturbing factors on the results of measurement. Using these variations, measurement circuit provides the additional number of measurements, equal to the number of the disturbing factors. System of equations describes these results of measurements. The solution of this system eliminates the influence of the appropriate uncertainty sources on the results of measurement and gets the true result of the measured value. In addition, the solution of this system also gets the values of the uncertainty components in every measurement and possibility to monitor the properties of the measurement circuit. Examples of the realization of this method for improving the accuracy of the impedance parameter measurements in different bridges are given.

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“…Early autotransformer bridges were described in [24,25]. These bridges have been widely used up to now [15,16].…”

Section: Autotransformer Bridge: Description and Analysismentioning

confidence: 99%

Variational Calibration

Surdu¹

2018

Metrology

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“…The resistance change is expected to be less than 1 ppm [4]. Resistors on stand and calibrated decade box form resistor R|\| in figure 1.…”

Section: Standard Low Voltage Resistorsmentioning

confidence: 99%

“…This procedure, used previously by Wenner [4] and others, is described in further detail in the Appendix.…”

Section: Guard Systemmentioning

confidence: 99%

“…The standard, NBS, low-voltage resistors are periodically calibrated in the Electricity Division at NBS. The calibration procedures are described in detail elsewhere [3,4] and are not discussed here. The low-voltage resistors that are most frequently used during calibrations of high-voltage dividers have nominal values of 1 kilohm and 10 kilohm.…”

Section: Calibration Of Low Voltage Resistorsmentioning

confidence: 99%

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High voltage divider and resistor calibrations

Misakian¹

1985

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An NBS calibration service for determining the ratio of highvoltage dc dividers and the resistance of high-voltage resistors is described. Calibrations are performed with a Wheatstone bridge apparatus with a simple guard system. Sources of systematic error are identified and methods for characterizing the NBS standard highvoltage resistors are discussed. Ratio and resistance values can be determined between the voltages of 10 kV and 150 kV with an uncertainty of less than ±0,01%.

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“…Its operation depends on the fact that if n nominally equal resistors are connected first in series and then in parallel, the ratio of the resistances of the two combinations is n 2 with an error reduced to second order in the degree of resistance matching. 8 The use of tetrahedral junctions between resistors 9,10 and compensating ("fan") resistors 11 (labeled R in Fig. 1) for paralleling the series-parallel network permit achieve-ment of high accuracy in the series-to-parallel transfer despite relatively high lead and connection resistances.…”

Section: Dr Lm /Dr* = [V Lm (R)-u 2 ]K Lmmentioning

confidence: 99%

ac-Josephson-Effect Determination ofehwith Sub—Part-Per-Million Accuracy

1970

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PHYSICAL REVIEW LETTERS 30 MARCH 1970 dR LM /dr* = [V LM (r)-u 2 ]K LM .Fortunately, the problem has a solution (many, in fact, since it turns out that one of the functions/, g, h, k, or n may be chosen arbitrarily).If we let n(r) = l-2m/r where m is the mass of the Schwarzschild field we find that f(r) = [x(X + l)r 2 + 3\mr + 6m 2 ]/r 2 (\r + 3m), g(r) = 1,and that r* = r + 2mln(r/2m-l),so thatwhere T/ , x /l-2m\2x 2 (X + l)r 3 + 6X 2 mr 2 4.18Xm 2 r + 18m 3 ,-.Note that the system (4) written as a single second-order equation assumes formally the Schrodinger formThanks are due to John A. Wheeler for conversations in which he suggested the approach to use in finding an effective-potential form for the even-parity equations.An ac-Josfephson-effect determination of e/h has been made using a new method. The accuracy of the result referred to the local voltage standard is 0.13 ppm. The accuracy referred to the National Bureau of Standards as-maintained volt is 0.46 ppm. The final value is 2e/A = 483.593 65 ±0.000 22 MHz//LtV 69NBS (0.46 ppm).The work of Parker, Taylor, and Langenberg 1 * 2 constant 2e/h. High-accuracy determinations of has established the ac Josephson effect in sys-the Josephson frequency-voltage ratio have been terns of weakly coupled superconductors as an reported by Parker et al. 2 and by Petley and Morimportant factor contributing to our knowledge of ris. 5 The former has recently been reassessed the fundamental physical constants 3 and as a po-and revised by Denenstein et al. 6 Both now have tential dc voltage standard. 4 Both of these appli-quoted one-standard-deviation uncertainties of cations are based upon the fact that in a Joseph-2.2 ppm and are in excellent agreement. A sigson-junction device biased at a dc potential dif-nificant increase in the accuracy with which the ference V, there exists a super cur rent oscillat-frequency-voltage ratio could be determined ing at a frequency v-2eV/h; the frequency-volt-would have important implications for our knowage ratio is thus simply the fundamental physical ledge of the fundamental physical constants and 738

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Methods, apparatus, and procedures for the comparison of precision standard resistors

Cited by 33 publications

References 16 publications

Variational Calibration

Variational Calibration

High voltage divider and resistor calibrations

ac-Josephson-Effect Determination ofehwith Sub—Part-Per-Million Accuracy

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