| 摘要 |
PURPOSE:To contrive to enhance manipulability, by a method wherein the key input of a keyboard including a key for an adjusting mode and the rising of a power source are detected and flip-flop is driven by a control part to bring a display selecting circuit to the adjusting mode. CONSTITUTION:At first, the segment check of a display part 7 is performed. When a tare key 5-1 is pushed at this time, a control part 6-2 sets flip-flop 6-6. Whereby, a display selecting circuit 6-7 selects the output of a subtracter 6-4 to display a count value and it is shown that said circuit 6-7 enters an adjusting node. In the next, when the tare key 5-1 is pushed, display shows a zero count. Thereafter, a reference wt. is placed and a wt. count proportional to the wt. thereof is displayed by a display device 7. The amplification degree of an amplifier 4 is adjusted so as to bring this count to a set value. After adjustment is finished, the wt. is removed. In this state, when a clear key 5-2 is pushed, the control part 6-2 enters a measuring mode and the flip-flop 6-6 is reset to display a wt. value. |
