Abstract: In this transducer, for converting an analog input signal into an analog output signal whose level corresponds to the level of the analog input signal, there are included: an A/D converter for converting the analog input signal into a digital signal; an input device comprising a plurality of switches; an upper limit setting means for setting an upper limit value for the analog input signal, according to operation of the switches; a lower limit setting means for setting a lower limit value for the analog input signal, according to operation of the switches; a storage device, for storing a current value of the digital signal output by the A/D converter; a comparison means for comparing the current value of the digital signal output by the A/D converter as converted from the analog input signal, and the upper limit value and the lower limit value, all of which are stored in the storage device; an output means for producing an output when the comparison executed by the comparison means indicates that the current

Abstract: In this transducer, for converting an analog input signal into an analog output signal whose level corresponds to the level of the analog input signal, there are included: an A/D converter for converting the analog input signal into a digital signal; an input device comprising a plurality of switches; an upper limit setting means for setting an upper limit value for the analog input signal, according to operation of the switches; a lower limit setting means for setting a lower limit value for the analog input signal, according to operation of the switches; a storage device, for storing a current value of the digital signal output by the A/D converter; a comparison means for comparing the current value of the digital signal output by the A/D converter as converted from the analog input signal, and the upper limit value and the lower limit value, all of which are stored in the storage device; an output means for producing an output when the comparison executed by the comparison means indicates that the current

Abstract: A transducer which converts an analog input signal into an analog output signal whose level corresponds to the level of the analog input contains an A/D converter and comparison means for indicating when the value of digital A/D output exceeds or falls below certain limits and includes an AC effective value-DC conversion circuit which avoids expensive square root circuitry while providing accurate conversion. A rectified voltage and a feedback voltage are applied to a current squaring circuit whose output is applied to an averaging circuit. The squaring circuit has a first conversion means for generating a current proportional to the rectified input and a second conversion means for dividing the sum of the rectified and feedback voltages, and converting the result to a rectified current. The currents are then summed and supplied to the averaging means.