| 摘要 |
PROBLEM TO BE SOLVED: To provide a detection circuit capable of adjusting sensitivity of a probe, without impairing a dynamic range characteristic of measurement. SOLUTION: In this detection circuit, a balancing variable resistor 3 is inserted in a resistance bridge circuit 2 which includes a detecting strain gauge G1 and a referring strain gauge G2 of the self-detection type probe 20 and is connected, the resistance bridge circuit 2 is applied with a pair of positive and negative DC voltages +VB, -VB from a DC power source 4 as the bias voltages, and a differential amplifier 5 amplifies a detection voltage V1 and a reference voltage V2 from the resistance bridge circuit 2, so as to output a detection output voltage V3.
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