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We report on the influence of voltmeters on measurements of the longitudinalresistance in the quantum Hall effect regime. We show that for typical inputresistances for standard digital lock-in amplifiers the longitudinal resistancecan show a non-zero minimum which might be mistaken for parallel conduction inthe doping layer. In contrast to a real parallel conduction the effectdisappears when either the current source and ground contact are swapped or thepolarity of the B-field is changed. We discuss the influence of inputcapacitances and stray capacitances on the measurement. The data demonstratesthe influence of the voltmeter input impedance on the longitudinal resistancemeasurement.Comment: 4 pages, 3 figures, 1 table Corrected capacitance from 400pF to 4n

Influence of voltmeter impedance on quantum Hall measurements