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It has a built\u2010in high resolution analog\u2010to\u2010digital convertor, and the numerical signal is passed to an attached personal computer via a universal serial bus. There the readings are plotted and can be saved in a file. The operating frequency (200\u20131000\u00a0kHz), as well as the excitation amplitudes (100\u2013350\u00a0V) of the signal and reference channels can be set independently by the user. This allowed a detailed evaluation of the influence of the individual sensitivities of the two channels on the electropherograms, and it is demonstrated that corrupt signals may be obtained for a referenced detector unless the working conditions are controlled appropriately. 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