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This paper describes a novel ac potentiometer composed of digital sinewave generators and inductive voltage dividers (IVD's) for the comparison of unlike impedances with different nominal values from a few 10 Q up to 1 k?? in the frequency range between 50 Hz and 1 kHz. As an example, the resistance of a 100-?? standard resistor may be compared with the capacitance of a 1-??F standard capacitor at a frequency of 400 Hz with a relative uncertainty of about 1 X 10-6 which is mainly due to the short-term stability of the digital sources.