| 摘要 |
PURPOSE:To improve temperature detecting precision by providing constant voltage circuits for applying constant voltage at both ends of serial circuits of resistance value changing type heat sensitive elements and resisters and connecting the serial circuits serially with constant voltage sources of which voltage can be adjusted. CONSTITUTION:At both ends of serial circuits 1, 2 of resistance value changing type heat sensitive elements Th1, Th2 and resisters R1, R2 are provided constant voltage circuits ZD1, C1, C2, SW1-SW4 for applying constant voltage, and the serial circuits 1, 2 are serially connected with voltage adjustable constant voltage lines VR3, VR4, OP2, OP3. By thus keeping measuring conditions constant any time, linear characteristics of resistance value changing type heat sensitive elements Th1, Th2 improved by the resisters R1, R2 are maintained. Adjustment width of temperature can thus be kept constant regardless of change of a room temperature. Temperature detecting precision is thus improved. |
