| 摘要 |
PURPOSE:To compensate for the inclination and the curve of temperature characteristics at a zero point, by superimposing the output component of a resistance bridge, wherein temperature-dependent resistors are provided on both sides of neighboring arms on an output of a strain gage bridge. CONSTITUTION:A resistor R1 and a resistor RA having large temperature dependency are connected in series. A resistor R2 is connected to the series-connected resistors R1 and RA in parallel, and Ralpha is formed. A resistor RB having large temperature dependency is connected to a resistor R3 in series. A registor R4 is connected to the series-connected resistors R3 and RB in parallel, and Rbeta is formed. A bridge circuit is formed by Ralpha, Rbeta, and the resistor R5 and R6. A feedback resistor R8 is connected between the inverted input terminal and the output terminal of an operation amplifier OP1. A differential amplifier is formed by an operation amplifier OP2 and resistor R9-R12. By selecting suitable values for the resistors R1-R4, temperature characteristics can be imparted to an output voltage VL of the operation amplifier OP1, so that the inclination and curve of the temperature characteristics in an output voltage Vin of a strain gage bridge are offset to each other. Thus temperature compensation can be performed. |
