Voltage balance for replacing the kilogram

The paper gives a short description of the basic principle of work of the ETF Voltage Balances, as well as the measurement procedures enabling the absolute determination of the Volt. We review previous results, and estimate the expected uncertainties for further experiments using the so-called charge-method. We review the calibration of the standards used with the balance. We have successfully started a new series of measurements at the end of 1993, and expect to report on the results at the end of 1994.