| 摘要 |
A load cell includes a magnetic circuit producing a constant magnetic field and a coil which is adapted to be suspended in such field and to which the mechanical force to be measured is applied. The coil is mechanically connected to the core of a linear voltage differential transformer and is energized with a pulsating direct current having an amplitude controlled by the displacement of the transformer core from a null or balanced position. The amplitude of the coil energizing current reacts with the magnetic field to precisely counterbalance the mechanical force applied to the coil and is proportional to that force. A digital ammeter is used to measure the DC value of the energizing current and thus to provide a readout of the force being measured.
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