How do scales that are capable of measuring incredibly tiny amounts of things actually work?
In: Technology
Besides the well known method of using strain gauges there is also the method called EMFR (Electro Magnetic Force Restoration) which is especially used in analytical scales to weigh really tiny amounts of material. Basically this method consists of a lever arm on which the item is placed and consequently deflects the lever arm. Then the current flowing through a coil is controlled very delicately to restore the equilibrium of the lever arm. The amount of current is used to deduce the weight. The design of an EMFR weigh cell is really ingenious when you see it the first time.
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