Circuit techniques for use in a digital phase-angle generator

Hess, Donald T.; Clarke, K.K.

doi:10.1109/tim.1987.6312708

Cited by 23 publications

(7 citation statements)

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“…One possibility to measure it is with the precise low-value resistance standard with the negligible phase delay. The resolutions of the phase measurement are around 10-5 degrees and standard uncertainties are around 10 o [5][6][7][8].…”

Section: Voltmetersmentioning

confidence: 99%

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Measurement of the Frequency Characteristic of Shunt with the Method of Two Voltmeters

Agrež

2007

2007 IEEE Instrumentation &Amp; Measurement Technology Conference IMTC 2007

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In the paper, a method of two voltmeters for measurement of the frequency characteristic of shunt is described. In this scheme two voltages and phase angle between them on almost equal shunts are measured to determine phase angle between current and voltage of one of shunts. In analysis of errors, it has been found out that this method has practical meaning at phase angle between shunts higher than few degrees, where accuracy is better than 5 1O-3

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Section: Voltmetersmentioning

confidence: 99%

“…and with substitution of tan q = cL/R it can be rearranged R2&U1|) -+tan2(l KRI U2,) I +tan2y2 (6) Phase angles qo and 2 between the current and the voltages U1 and U2 are difficult to measure. It is easier to measure their difference A(p = o -o2 or the phase difference of the two sine shape voltages.…”

Section: Voltmetersmentioning

confidence: 99%

Measurement of the Frequency Characteristic of Shunt with the Method of Two Voltmeters

Agrež

2007

2007 IEEE Instrumentation &Amp; Measurement Technology Conference IMTC 2007

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“…The bridge uses a two-phase digital phase-angle generator [2] as a convenient means of providing stable voltages to balance a classical bridge, rather than as a calibrated digital source, or as a means for providing stable voltages for ratiometric measurement using a sampling digital multimeter [3]. The bridge can be configured either as a Maxwell bridge for measuring impedance, as shown in Fig.…”

Section: Basic Brideementioning

confidence: 99%

Digital generator assisted impedance bridge

Corney

Conference Digest Conference on Precision Electromagnetic Measurements

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A manually-operated prototype wide-range fourterminal-pair universal impedance bridge has been constructed in order to test ideas for an automated bridge. The least.relative uncertainty is 2x10'' at I kHz and about 2 0~1 0~ at 100 kHz. A two-phase digital voltage generator provides convenient sources for the two voltages required to bring the bridge to near but not exact balance. The detector offset voltages are measured with a vector voltmeter and used to correct for the inexact balance.

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“…The dual-channel versions are usually used for generating the measuring signals for testing wattmeters, watthourmeters, as bridge generators etc, and few of them are dedicated for precise setting of the power-factor / phase-shift [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…For the calibration purpose only, precise digital wattmeter is used, following known idea [2] of applying convenient multiplying device, expecting zero-output for the phase shift between voltage and current outputs of the calibrator equal to 90' or -90'.…”

Section: Introductionmentioning

confidence: 99%