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The gravitational-wave detectors outputs from the LIGO and Virgocollaborations have been a source of scientific results of prime importance invarious domains such as astrophysics, cosmology or fundamental physics. Withthe upgrades of the detectors and their improved sensitivities, new challengesare set for these instruments calibration. A calibration method based on thelocal variations of the Newtonian gravitational field could be the nextabsolute reference of calibration for the interferometers network. We reportnew tests of Newtonian calibrators (NCal) on the Advanced Virgo detectorperformed during the LIGO-Virgo observing run O3. The NCal-induced strain on amirror of the interferometer has been computed both using analyticalcalculations and numerical simulations with results in very good agreement. Thestrains given by the numerical model have been used to analyse the data of theNCals and have been compared to the reference method of calibration usingphoton radiation pressure. New methods to measure the NCal to mirror distanceand the NCal offset with respect to the plane of the interferometer using twoNCals are also presented and used to correct the NCal data which improves theagreement with the current Advanced Virgo reference of calibration.

Newtonian calibrator tests during the Virgo O3 data taking