A high-accuracy 10 Hz-1 MHz automatic AC voltage calibration system

Oldham, N.M.; Parker, Matthew; Young, A.M.; Smith, Alan

doi:10.1109/tim.1987.6312575

Cited by 18 publications

(5 citation statements)

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“…Measured uncertainties thus consist of the sum of the uncertainty of the thermal voltage converter and the uncertainty of the dc reference voltage (~5ppm). Uncertainties of the thermal ac-dc transfer standards vary from 10 ppm at audio frequencies to 100 ppm in the megahertz range [8] to about 1% as one approaches gigahertz frequencies. A detailed summary of the uncertainties of NIST thermal ac-dc transfer calibration is shown in figure 1.…”

Section: Voltagementioning

confidence: 99%

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Assessments of space power related measurement requirments of the Strategic Defense Initiative

Olthoff¹

1989

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Section: Voltagementioning

confidence: 99%

“…Comments: [3][4][5][6][7][8] MPa is for gas cooled systems, 0.241 MPa for liquid lithium cooled systems. This is not considered a critical measurement, and be adequately monitored by the coolant-pressure measurements.…”

Section: Anticipated Measurement Techniquementioning

confidence: 99%

Assessments of space power related measurement requirments of the Strategic Defense Initiative

Olthoff¹

1989

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“…A program is evolving at NIST to allow a customer’s process to be monitored by NIST staff during the test [ 120 , 121 , 122 ]. It employs the Internet to improve communications, so the customer can transfer test data, download test procedures, and use NIST control software for system evaluation.…”

Section: Electrical Metrology At Nist In the Twenty-first Centurymentioning

confidence: 99%

The ampere and electrical standards

Elmquist¹,

Cage²,

Tang³

et al. 2001

J. Res. Natl. Inst. Stand. Technol.

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This paper describes some of the major contributions to metrology and physics made by the NIST Electricity Division, which has existed since 1901. It was one of the six original divisions of the National Bureau of Standards. The Electricity Division provides dc and low-frequency calibrations for industrial, scientific, and research organizations, and conducts research on topics related to electrical metrology and fundamental constants. The early work of the Electricity Division staff included the development of precision standards, such as Rosa and Thomas standard resistors and the ac-dc thermal converter. Research contributions helped define the early international system of measurement units and bring about the transition to absolute units based on fundamental principles and physical and dimensional measurements. NIST research has helped to develop and refine electrical standards using the quantum Hall effect and the Josephson effect, which are both based on quantum physics. Four projects covering a number of voltage and impedance measurements are described in detail. Several other areas of current research at NIST are described, including the use of the Internet for international compatibility in metrology, determination of the fine-structure and Planck constants, and construction of the electronic kilogram.

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“…d) The DSS is programmed to output a negative direct voltage and adjusted to bring the TVC output as close as possible to The adjusted voltage is measured. e) The ac-dc difference is given by (3) where and power exponent at [3], [4]. The mean ac-dc difference of the 2 V TVC at 40 Hz measured using the DSS was 0.…”

Section: Digitally Synthesized Sourcementioning

confidence: 99%