| 1. |
- Rydler, Karl-Erik, et al.
(författare)
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High accuracy low-voltage ac-dc transfer standards
- 1994
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Ingår i: Proceedings of Conference on Precision Electromagnetic Measurements Digest. - 0780319842 ; , s. 382-383
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Micropotentiometers and resistive dividers are designed using thick-film chip resistors. Two methods to determine the ac-dc transfer difference at low voltages using micropotentiometers and resistive dividers are described. At 10 mV, the difference between the two methods are less than 10 ppm at 1 kHz and less than 100 ppm at 1 MHz.
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| 2. |
- Simonsson, Pär, 1963-, et al.
(författare)
-
A comparison of power measuring systems
- 1997
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Ingår i: IEEE Transactions on Instrumentation and Measurement. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9456 .- 1557-9662. ; 46:2, s. 423-425
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Tidskriftsartikel (refereegranskat)abstract
- An automatic zero-power-factor standard has been designed and compared with a digital sampling wattmeter standard. The agreement of the two power measuring standards at 120 V, 5 A, and zero power factor is within a few uW/VA. The paper describes the standards, the phase errors and uncertainties of the two standards
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| 3. |
- Simonsson, Pär, 1963-, et al.
(författare)
-
Level dependence of AC-DC transfer devices
- 1999
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Ingår i: IEEE Transactions on Instrumentation and Measurement. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9456 .- 1557-9662. ; 48:2, s. 395-398
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Tidskriftsartikel (refereegranskat)abstract
- A new method based on summing of phase controlled AC voltages makes it possible to compare thermal voltage converters with a ratio of 2:1 without introducing any error due to level dependence. The method is used to determine the level dependence of thermal voltage converters up to 1 kV and 100 kHz. The level dependence is compared to the change of AC-DC transfer difference due to power dissipation in the range resistor and due to DC-effects in the thermal converter. The results for two investigated TVC's indicate that the power dissipation is the only cause of level dependence in the range resistor of a high voltage TVC.
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