| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent deterioration in detecting accuracy of a detector in a non-disconnection state to the detector. SOLUTION: Power source voltage VCC is applied to a connection point D1 of a detection signal generating circuit 15 connected to a middle point C1 of a pair of strain gages 13a, 13b through a resistor 21 having larger resistance value than the strain gages 13a, 13b. The connection point D1 is earthed through a Zener diode 23. First Zener voltage Z1 is set in a value exceeding a voltage value larger by the maximum value of differential voltage (V2 -V1 ) than the maximum value of a second voltage signal V2 corresponding to a load detecting range. Similarly, the power source voltage VCC is applied to a connection point D2 connected to a middle point C2 of strain gages 13c, 13d through a resistor 22, and the connection point D2 is earthed through a second Zener diode 24.</p> |
