Device for self-checking precision weighing appliances

摘要

The invention relates to precision weighing appliances with switching weights and force transducers or force-compensating systems. The aim of the invention is to provide extended possibilities of use with a higher accuracy class for self-checking precision weighing appliances. The object of the invention is to broaden the range of the electronically determined mass value and to make it possible to check it in each weighing cycle, whilst the number of switching weights and the control are to be reduced and the lifting mechanism simplified. The essence of the invention is that, in the abovementioned precision weighing appliance, only one motor-actuated switching lever and one switching weight, which corresponds in its mass to the electronic positive measuring range = negative range of the force transducer or force-compensating system, is connected to a load carrier in the calibration position and is tared mechanically by means of mass with the aid of a lever, and, in the lifted-off position of the switching weight, a negative final value of the electronic measuring range of the force transducer or force-compensating system = zero point of the weighing range is assigned via a computer. <IMAGE>