TEST METHOD FOR RMS VOLTMETERS Russian patent published in 1994 - IPC

FIELD: electric measurement technology. SUBSTANCE: according to method, voltmeter under test incorporating error burst function measures sum of low-frequency three-level voltage with zero DC component and high-frequency sine-wave voltage with preset RMS value. Measurement result error module is determined and recorded. Entire procedure is repeated several times while setting different levels of three-level voltage limited by ± U_n values. Maximum is selected from recorded error modules and treated as maximum permissible measurement error for voltage of arbitrary waveform with mentioned RMS value and amplitude limited by U_m value. EFFECT: improved reliability of test results. 3 dwg