Conversion circuit for an electromagnetic flow transmitter
Номер патента: CA2066571A1
Опубликовано: 21-03-1991
Автор(ы): David L. Wehrs
Принадлежит: Individual
Опубликовано: 21-03-1991
Автор(ы): David L. Wehrs
Принадлежит: Individual
Реферат: A magnetic flowmeter generates an alternating potential (V19) representing flow. A controlled current (I12) excites the flowmeter with first and second amplitudes of current. A correction output (I26) represents the first and second amplitudes. A circuit (36) connected to the correction output (I26) and the alternating potential (V19) oscillates at a frequency representing the alternating potential corrected for variation of the first and second amplitudes. Frequencies of the oscillations at first and second amplitudes are measured (38). An output is calculated (39) as a function of a subtraction of the first and second measured frequencies such that the effect of offset is reduced.
Linearizing circuit device for an electromagnetic log
Номер патента: US3570308A. Автор: Haruo Kawamoto. Владелец: Tokyo Keiki Seizosho Co Ltd. Дата публикации: 1971-03-16.