| 摘要 |
PURPOSE:To improve measurement precision by dividing the output voltage of a constant voltage circuit by the combination of a temperature sensor and a temperature compensating circuit arranged in series, and interposing the temperature compensating circuit between inputs of a driving transistor (TR). CONSTITUTION:One-side terminals of thermistors 7 and 8 for measurement which are arranged as temperature sensors are connected in common to the emitter of a control TR4, and the other-side terminals are connected to fixed contacts of a changeover switch 9 respectively. Its movable contact is connected to the base of the driving TR13 and also connected to one terminal of the temperature compensating circuit 10. Then, a noise absorbing capacitor 14 is connected between the base and collectors of the driving TR13, and a movable coil type instrument 15 is connected as a load between its emitter and earthing point. The combination of the circuit including the thermistors 7 and 8 for measurement and the temperature compensating circuit 10 arranged in series is interposed between output terminals of the constant voltage circuit 3, whose output voltage is divided. |
