Display device by means of a hand

A display device by means of a hand for indicating a physical quantity by moving the hand forward or backward by an angle of a unit per step within a selected measuring range of a predetermined angle corresponding to a predetermined number of steps, comprising:

• an A/D converting circuit for converting a physical quantity to be measured to a digital data corresponding to said quantity;
• a stepping motor and an indicating mechanism driven thereby for indicating said physical quantity;
• a stepping motor driving circuit;
• a converting circuit for converting said digital data into forward or backward driving signals equal in number to the steps corresponding to a difference between a new digital data and an old digital data for sending the forward or backward driving signals to said driving circuit;
• and
• inhibiting circuit means for inhibiting a generation of said forward or backward driving signals which make the hand move out of the selected measuring range without changing the selected measuring range in the event that said physical quantity becomes larger or smaller out of the selected measuring range and for stopping the hand temporarily at least, said inhibiting circuit including detecting circuit means for detecting purely electrically the fact that the hand has reached an end of the selected measuring range or will deviate from the selected measuring range, and when said inhibiting circuit inhibits the generation of said forward or backward driving signals to be inputted in said stepping motor driving circuit.