| 摘要 |
PURPOSE:To perform an easy and rapid measurement for span regulation without disconnection of a power source, by a method wherein an output of a load cell is regulated by matching a given value of a control voltage through varying of an exciting voltage of a bridge circuit. CONSTITUTION:If a control voltage E1, applied to an oscillating circuit 2 from a stabilizing power source 1 through a variable resistance VR, is caused to change, an exciting voltage E2 changes. An output of a bridge circuit, formed of a measuring electrode capacitor Cx via transformer 3 and a reference capacitor Cs, is measured through a capacitor C1 and half-wave rectifying circuit 4. A voltage E0 satisfies a condition of a formulaI, and the measurement of the voltage E1 by a terminal TE1 decides a constant K. Thus, if, with a power source ON, an increase of voltage is made on a load cell to decide an output span voltage Vs, a formula II decides a control voltage Vx. If a resistance VR is adjusted over the measurement of the voltage Vx by a terminal TE1, it enables to perform an easy and rapid measurement for span adjustment. |
