DEVICE FOR DRIVING STEPPING MOTOR-TYPE INSTRUMENT

摘要

A stepping motor type instrument 6 has driving circuits 3, 4 for driving a stepping motor based on a digital signal corresponding to a measurement quantity and a needle 9 fixed to a driving shaft end of this stepping motor indicates the measurement quantity by pointing out a graduation 8 on a character panel 7 corresponding to the measurement quantity. Further this stepping motor type instrument contains processing means 3 in which a digital signal corresponding to the measurement quantity is input and converted to an indication angle data at a predetermined frequency, and delay means 4 in which a difference between continuous indication angle data front and back output by the processing means 3 at the conversion frequency is obtained and if the difference is larger than a predetermined value, the signal is converted so that its change is less than the predetermined value and continuous indication angle data is output, thereby preventing a step-out and carrying out operation securely following a change in the measurement quantity. <IMAGE>