NBS 50 kHz phase angle calibraion standard

Turgel, R. S.

doi:10.6028/nbs.tn.1220

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…As illustrated in figure 9 , by changing the time sequence of digital codes that are input simultaneously to a second DAC, a pair of stepped sine waves can be generated having a relative phase angle difference that is established essentially by the calculated sets of sample points, independent of the fundamental frequency and any other timing considerations used in the digital synthesis process. This is the basis for a precision 2 Hz to 50 kHz Phase Angle Calibration Standard that was developed at NIST [ 20 , 21 ]. An earlier version of this design approach was used for generating reference phase angle signals up to 5 kHz [ 6 , 7 ].…”

Section: Generating Reference Waveforms Digitallymentioning

confidence: 99%

Standards for waveform metrology based on digital techniques

Bell

1990

J. RES. NATL. INST. STAN.

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Over the last decade the use of digital synthesis and sampling techniques for generating and measuring electrical waveforms has increased dramatically with the availability of improved digital-to-analog (D/A) and analog-to-digital (A/D) converters and related devices. With this evolution has come the need for physical laboratory standards and test methods to support the performance specifications of digital devices and the instruments in which they are used. This article describes the research and development at NIST of several laboratory standards and test systems that utilize “digital technology” for characterizing data converters and for implementing various waveform synthesis and sampling instruments.

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Section: Generating Reference Waveforms Digitallymentioning

confidence: 99%

Standards for waveform metrology based on digital techniques

Bell

1990

J. RES. NATL. INST. STAN.

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“…With increased frequency, all of the effects are more pronounced. A fuller discussion is given in [ 2 ] and [ 4 ]. Specifications shown in table 1 are based on experimentally determined accuracies of the three prototype phase standards built at NBS.…”

Section: Phase Standard Prototypementioning

confidence: 99%

Phase meter calibration at NBS

Turgel¹

1988

J. RES. NATL. BUR. STAN.

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To provide a phase meter calibration service, a phase angle calibration standard has been developed at NBS. This standard is a signal. generator with two sinusoidal outputs and uses direct digital synthesis to generate the signals. The phase angle between the two sinusoids is determined by the input parameters in the calculation of the sets of digital values from which the analog output is synthesized. An auto-zero compensation mode corrects for residual phase differences in the two output channels. The phase resolution is better than 0.002' over a frequency range from 2 Hz to 5 kHz and 0.005' from 5 to 50 kHz. Phase meter calibration data are fitted to a linear model from which appropriate corrections for the phase meter readings can be derived. Statistical treatment of the data provides an estimate of the uncertainty of the corrected phase meter readings relative to the phase angle calibration standard.

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“…Results for the 0.1-, 0.2-, and 0.5-V ranges were always better than these, and the results for the 10to 500-V ranges using the 100to-1 attenuator were generally poorer by a factor of about two . The differential' time delays for the various gain settings of the input modules were measured using the-NBS Phase Angle Standard [10]. This phase standard produces two sine waves with an accurate phase angle between them which is very stable and can be changed in steps of about 1.4 millidegrees .…”

Section: Calibration Testsmentioning

confidence: 99%

NBS wideband sampling wattmeter

Stenbakken¹

1987

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A special feature of the sampling wattmeter is the use of programmable time delay circuits to compensate for differential time delays between the two input channels.Performance tests of the wattmeter show that it has a measurement uncertainty of less than ±0.1 percent of full-scale amplitude over the above described frequency range This technical note gives schematic diagrams of the circuits used in this wattmeter and describes their operation.The software is also described, and flow charts and selected program listings are provided for the programs written in Pascal. The results of calibration of the instrument over the past year are also presented.

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NBS 50 kHz phase angle calibraion standard

Cited by 4 publications

References 3 publications

Standards for waveform metrology based on digital techniques

Standards for waveform metrology based on digital techniques

Phase meter calibration at NBS

NBS wideband sampling wattmeter

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