Abstract: In a temperature probe having a thermistor controlling the output frequency of an oscillator to effect a temperature-frequency conversion, and a remote measuring station having a frequency detection means, the invention features, generally, a switch in the probe connected to a detection circuit, the oscillator being connected to the switch so as to open and close the circuit in response to the oscillator output frequency.

Abstract: A measurement system of the type having a sensor the electrical resistance of which varies as a function of a parameter being measured, and a bridge circuit connected to the sensor, wherein a source of a reference voltage is provided to excite the bridge to produce a bridge output indicative of the parameter being measured when the bridge is balanced, the bridge output being dependent upon the sensor resistance and the reference voltage except that the system includes circuitry for causing the output to be independent of the reference voltage at one end of a range of values of the parameter, and output circuitry is provided for converting the bridge output into a system output in accordance with an output function, featuring, in one aspect, first calibration circuitry connected to the output circuitry to provide a first calibration signal for calibrating the system at one end of the range by controlling the output function; second calibration circuitry connected to the bridge circuit to provide a second calib

Abstract: In a measurement system having a sensor the electrical resistance R.sub.s of which varies as a function of a parameter being measured, and a bridge circuit having the sensor and a long transmission wire in a first arm connected to a first control node, a second long transmission wire in a second arm connected to a second control node, and third and fourth arms respectively connected to the first and second nodes, the wires having equal resistances R.sub.