| 摘要 |
PURPOSE:To make the effect of fluctuation in current conduction as small as possible, by applying a pulse current, whose amplitude is larger than that of a rated current, to gage resistors formed in a semiconductor diaphragm when a power source is turned ON. CONSTITUTION:Gage resistors 3a-3d are formed in a semiconductor diaphragm. A bridge circuit BR is constituted of the resistors 3a-3d. When a power source is turned ON, a large current flows to the circuit BR through a capacitor C15 and a variable resistor R2. The resistors 3a-3d are heated, and the temperature of the entire diaphragm is quickly increased to a specified temperature. When the charging of the C15 is finished, a rated current I is supplied to the circuit BR through a constant current circuit 14. Thus the effect of the fluctuation in current conduction can be made as small as possible with respect to the output of a sensor at output terminals 6a and 6b. |
