PURPOSE:To give the additional throw-in for combined balance to the measuring instrument performing the lightest weighing by weighing the minimum amount and then selecting the weighing instrument through the comparison between the increasing lamp voltage and the weighing output of each weighing instrument. CONSTITUTION:The combination among plural number of weighing instruments 2a, 2b... is selected via combined generator 10, and the weighed value becomes within the upper and lower limit value range of the weighing target. The weighing output of these selected instruments 2a, 2b... are compared with the gradually increasing lamp voltage delivered from lamp signal generator circuit 28 via comparators 26a, 26b and so on. And the coincidence output is memorized in memory circuits 30a, 30b... using FF. Thus weighing instruments 26a, 26b... which measured the lightest amount are decided via circuits 30a, 30b... corresponding to the minimum value of the lamp voltage delivered from circuit 28, and the additional throw-in is given to instruments 26a, 26b... via throw-in control circuit 32 and the like. Accordingly, the additional throw-in is given to the weighing instrument measured the lightest amount in case the weighing target value is not obtained by the first combination, thus ensuring the accurate and quick combination among the balances.
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