Abstract: If input signal is transmitted to a main body unit, a sensor amplifier stores the input signal in itself as measurement data, and transmits the input signal with the added transfer order information to the main body unit. By checking the transfer order information added to the input signal, the main body unit can confirm if the input signal is deficient or not. Upon the end of the measurement of the physical quantity, the main body unit transmits the retransmission request that requests the retransmission of the deficient portion of the data to the sensor amplifier. According to the retransmission request from the main body unit, the sensor amplifier extracts the deficient portion of the input signal data stored in itself and retransmits the extracted input signal data to the main body unit.

Abstract: If input signal is transmitted to a main body unit, a sensor amplifier stores the input signal in itself as measurement data, and transmits the input signal with the added transfer order information to the main body unit. By checking the transfer order information added to the input signal, the main body unit can confirm if the input signal is deficient or not. Upon the end of the measurement of the physical quantity, the main body unit transmits the retransmission request that requests the retransmission of the deficient portion of the data to the sensor amplifier. According to the retransmission request from the main body unit, the sensor amplifier extracts the deficient portion of the input signal data stored in itself and retransmits the extracted input signal data to the main body unit.

Abstract: An apparatus that automatically adjusts self-noise and 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 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 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 so as to conform to the sensor sensitivity G, and a measured value correcting circuit 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.

Abstract: 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.