"RIV/00025615:_____/13:#0001948" . "0026-1394" . "Metrologia" . "On the gravimetric contribution to watt balance experiments" . "RIV/00025615:_____/13:#0001948!RIV14-MSM-00025615" . "[1B3C80F0901D]" . . "It has been recommended that the relative standard uncertainty of the numerical value of the Planck constant required for the redefinition of the kilogram should not exceed 2E-8. To reach this goal using experiments based on a watt balance, the free-fall acceleration (g) traceable to the SI, at a given point and a given time, needs to be known with a sufficiently small uncertainty well below 2E-8. Reducing the uncertainty in g allows the other uncertainties related to the watt balance to be increased. Instead of a simultaneous operation of an absolute gravimeter with a watt balance, we propose an alternative approach and demonstrate that a standard uncertainty below 5 microGal (relative uncertainty of 5E-9) is reachable under the conditions at BIPM. In our approach we combine the following information: (1) the Key Comparison Reference Values obtained from the CCM.G-K1, a key comparison carried out in the frame of the International Comparison of Absolute Gravimeters in 2009 (ICAG2009); (2) the accurate gravity network established using the qualified absolute and relative gravimeters; (3) temporal gravity variations based on observed Earth-tide parameters and modelled effects of polar motion and atmospheric mass redistribution; (4) uncertainty estimates that account for non-modelled effects; (5) the option to carry out absolute gravity measurements once every one or two years with two or more gravimeters for monitoring the stability of the gravity field at the BIPM." . . . . "Jiang, Zhiheng" . "It has been recommended that the relative standard uncertainty of the numerical value of the Planck constant required for the redefinition of the kilogram should not exceed 2E-8. To reach this goal using experiments based on a watt balance, the free-fall acceleration (g) traceable to the SI, at a given point and a given time, needs to be known with a sufficiently small uncertainty well below 2E-8. Reducing the uncertainty in g allows the other uncertainties related to the watt balance to be increased. Instead of a simultaneous operation of an absolute gravimeter with a watt balance, we propose an alternative approach and demonstrate that a standard uncertainty below 5 microGal (relative uncertainty of 5E-9) is reachable under the conditions at BIPM. In our approach we combine the following information: (1) the Key Comparison Reference Values obtained from the CCM.G-K1, a key comparison carried out in the frame of the International Comparison of Absolute Gravimeters in 2009 (ICAG2009); (2) the accurate gravity network established using the qualified absolute and relative gravimeters; (3) temporal gravity variations based on observed Earth-tide parameters and modelled effects of polar motion and atmospheric mass redistribution; (4) uncertainty estimates that account for non-modelled effects; (5) the option to carry out absolute gravity measurements once every one or two years with two or more gravimeters for monitoring the stability of the gravity field at the BIPM."@en . "http://iopscience.iop.org/0026-1394/50/5/452" . "I, P(ED1.1.00/02.0090)" . "50" . "93884" . . "10.1088/0026-1394/50/5/452" . . . . "P\u00E1link\u00E1\u0161, Vojt\u011Bch" . "On the gravimetric contribution to watt balance experiments"@en . . "On the gravimetric contribution to watt balance experiments" . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "gravity acceleration; free-fall acceleration; gravimeter; watt balance; kilogram"@en . . "On the gravimetric contribution to watt balance experiments"@en . "13"^^ . . . . . . . "20"^^ . "5" . "1"^^ . . . . "000330831400005" .