| 摘要 |
Force measuring equipment has a magnetoelastic transducer with an excitation winding supplied with alternating current, which generates a primary flux in a magnetic core of the transducer, and a measuring winding in which a signal voltage is induced, the signal voltage giving a measure of the force applied to the transducer core. The signal voltage is supplied to signal processing members which are arranged to form an output signal by phase-sensitive rectification of the signal voltage. Control members sense when the primary flux passes a positive and a negative reference level, and switch polarity reversing members at the times during each period of the AC supply when the primary flux with a certain sign of its time rate of change passes the positive reference level and with the opposite sign of its time rate of change passes the negative reference level. |
