| 摘要 |
PURPOSE:To obtain a highly reliable circuit that corrects a secant, by giving a weight to the resistance value of a feedback circuit of an operational amplifier and switching the resistance value successively to secure an approximation to the secant correction of an angle of elevation. CONSTITUTION:The synchronous signal supplied from an angle detector 1 attached to the axis of angle of inclination is converted into a digital angle through a synchronous-digital converter 8 and then converted into three kinds of control signals A0, A1 and A2 that controls a multiplexer 9 and according to the value of the digiral angle. The signals A0, A1 and A3 are combined with the control signal which decides whether a secant correcting circuit is actuated or not, and thus functions as a switch for 8 channels. When the control signal is at H level, an operational amplifier 7 functions as a secant correcting circuit. While the amplifier 7 funtions as an amplifier having a constant gain when the control signal is at L level. |
