METHOD FOR AUTOMATICALLY ADJUSTING MEASURING INSTRUMENT AND DEVICE USING THE SAME

摘要

The present invention provides an apparatus that automatically adjusts self-noise which apparatus can lower the lower limit value of a measurement range by reducing the effects of self-noise on measured values. This apparatus corrects self-noise when amplifying an output signal from a sensor 1 so as to conform to a sensor sensitivity G, further processing the amplified signal, and then outputting the processed signal as a measured value. This apparatus includes a sensor sensitivity adjusting circuit 3 that adjusts an amplification factor so as to conform to the sensor sensitivity G, a self-noise value calculating circuit 4 that calculates a self-noise component F.N from the amplification factor adjusted by the sensor sensitivity adjusting circuit 3 so as to conform to the sensor sensitivity G, and a measured value correcting circuit 6 that calculates a true measured value F.S from the self-noise component F.N calculated by the self-noise value calculating circuit 4 as well as a measured value L containing the self-noise component F.N. <IMAGE>