NOVELTY - The method involves measuring a first monitored condition e.g. pressure or temperature to generate a first monitored condition signal and converting the first monitored condition signal to a first frequency modulated signal having a first frequency. A second frequency modulated signal having a reference frequency is generated. The first frequency modulated signal and the second frequency modulated signal are transmitted using time division multiplexing. A ratio of the first frequency and the reference frequency is associated with pressure.    USE - Method for transmitting and measuring signal for sensors e.g. piezoresistive bridge or transducers for use in oil and geothermal exploration fields. Can also be used in transmitting and measuring signal for transducers used in e.g. combustion engines and injection molding.    ADVANTAGE - The ratio of the signals is a direct measure of the transducer output, and eliminates all sources of errors. As the transducer output and the reference signal are passed through the same chain, and are affected by the same errors, the ratio calculation eliminates all errors due to variations in the supply voltage. There is a reduced number wires for multiple transducers resulting in greater cost savings, less complexity, and improved reliability by a way of interfacing several pressure sensors to a measuring system using only one wire for the signal and power and a return wire which is usually the conduit of the signal/power wire. The signal transmission system is also applicable and advantageous for use in systems operating at more benign temperatures and over shorter distances as the wiring as well as the measuring method can be simplified.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a signal transmission and measuring system for sensors.    DESCRIPTION OF DRAWING(S) - The drawing shows a circuit diagram of a signal measuring system illustrating method of measuring the output of the sensor interface.    Wire (15)    Resistor (60)    Analog-to-digital converter (61)    Microcontroller (62)