Measurement of relative and true power factors of air capacitors

Astin, A. V.

doi:10.6028/jres.021.024

Cited by 19 publications

(7 citation statements)

References 7 publications

(25 reference statements)

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“…Older papers [9], [10] have indeed shown a frequency dependence caused by thin film layers deposited on electrode surfaces; unfortunately, to our knowledge, no data are available for commercial capacitor models. To measure this ac-dc difference, a measurement setup similar to that described in Ref.…”

Section: Capacitorsmentioning

confidence: 94%

A Current Source for Picoamperemeter Calibration

Callegaro

D'Elia

Trinchera

2006

2006 IEEE Instrumentation and Measurement Technology Conference Proceedings

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A traceable current source for the calibration of lowcurrent meters (picoamperemeters, electrometers) in the 100 fA-100 pA current range is here presented. It is based on a lowfrequency trapezoidal wave generator, measured with a sampling voltmeter, which charges and discharges a gas-dielectric capacitor. The generated current is traceable to units of voltage, capacitance and time. The source will be employed to extend in the lower range the Italian national standard of dc current, and for the Italian participation in the EUROMET.EM-S24 international intercomparison. Being simple and inexpensive, the source can find application in secondary calibration laboratories.

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Section: Capacitorsmentioning

confidence: 94%

A Current Source for Picoamperemeter Calibration

Callegaro

D'Elia

Trinchera

2006

2006 IEEE Instrumentation and Measurement Technology Conference Proceedings

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“…Also, losses in any surface films on the electrodes must be evaluated. It is known that s ome electrode materials form oxide films which might be expected to exhibit losses [3,4,5,6,7,8,9,10,13].…”

Section: 1 General Considerationsmentioning

confidence: 99%

“…Also, for any single set of curves, it will be assumed that 0; has a single value, usuall y, in the actual m easurem ents to b e presented later, 20.000 pf. 6 'rhis relat ion is derived in full in the appendix, section 7.…”

mentioning

confidence: 99%

Residual losses in a guard-ring micrometer-electrode holder for solid-disk dielectric specimens

Scott¹,

Harris²

1961

J. RES. NATL. BUR. STAN. SECT. C. ENG. INSTR.

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A guard-ring m icr.ometer-cl ectmde holder especiall y d es igned for use in ma king di electri c m eas urements on sohd-dL s k sp ecimens of low-loss mate ri a ls has been constructed. A metho~ of de~e rminin g th e sepa rati(;H1 of t he electmdes to ± 1 micron, usin g ball reference gages,. L S d escnbed . R es ldu a ll o ss~s LLl t he guard-rin g holder, a nd also in t he bridge standard capaci to r used In the Schenn g bndge employed for the measurements, caused by losses i n s ur:ace film s o n t he clectrod es and by seri es r esistance in t he leads, were accura tely measured . It IS shown t hat at fr equ encies fr om 100 cycles pe r seco nd to 100 kilo cycles per second t hese resLdu a llosses a re .not .more t ha n a fe \\' microradi a ns. Us ing co rrections t hu s obtained , t ile hold er-bridge co mbinatIO n can be used to measure t he losses of low-l oss mate ri a ls with grel"lter accuracy t ha n heretofor e. .

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“…3 The function of this resistance in the bridge balance has been discussed by Astin in his detailed analysis of the bridge [4] .…”

Section: Electrical Measurements 1 Dielectric Constant and Loss mentioning

confidence: 99%

Dielectric constant, power factor, and conductivity of the system rubber-calcium carbonate

Scott¹,

McPherson²

1942

J. RES. NATL. BUR. STAN.

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The dielectric constants and power factors of mixtures of calcium carbonate with Vistanex and with natural rubber were determined at 1 and 100 kilocycles per second. There was little difference between the values at the two frequenciel'. Two different formulas were found to express the dielectric constants of the mixtures as functions of the dielectric constants of the respective components. The dielectric constant of the pure calcium carbonate employed was determined by the method of liquid mixtures. The power factors of the rubber-calcium carbonate mixtures were intermediate between those of the components. The conductivities of the Vistanex-calcium carbonate mixtures measured at the end of 1 minute of electrification were intermediate between those of the components, but the conductivities of the mixtures of natural rubber and calcium carbonate seemed to go through a minimum. CONTENTS Page

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Measurement of relative and true power factors of air capacitors

Abstract: An alternating-current bridge for measuring the differences of power factor of capacitors to ± 5 X 10-7 in the commercial and audio-frequency range is described.

Cited by 19 publications

References 7 publications

A Current Source for Picoamperemeter Calibration

A Current Source for Picoamperemeter Calibration

Residual losses in a guard-ring micrometer-electrode holder for solid-disk dielectric specimens

Dielectric constant, power factor, and conductivity of the system rubber-calcium carbonate

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