Measurement apparatus

A measurement apparatus comprising:

• a first oscillator circuit and a second oscillator circuit, each oscillator circuit being arranged to generate a respective oscillating output signal and comprising at least a respective first component having a property determining a respective output frequency of the respective oscillating output signal;
• a sensor configured to sense a measurand the sensor comprising said first component of the first oscillator circuit, said property of said first component of the first oscillator circuit being dependent upon said measurand;
• and
• circuitry arranged to receive said oscillating output signals and generate a first output signal, said first output signal being indicative of a number of cycles of one of the first and second oscillating output signals in a time period determined by a period of the other of said first and second oscillating output signals, wherein the first and second oscillators are arranged such that their oscillating output signals have different frequencies over a range of values of the measurand, and wherein said circuitry comprises no frequency divider circuitry arranged to receive one of said oscillating output signals and generate a further output signal oscillating at a fraction of the frequency of said received one of the oscillating output signals.

A measurement apparatus comprising:

• a first oscillator circuit and a second oscillator circuit, each oscillator circuit being arranged to generate a respective oscillating output signal and comprising at least a respective first component having a property determining a respective output frequency of the respective oscillating output signal;
• a sensor configured to sense a measurand, the sensor comprising said first component of the first oscillator circuit, said property of said first component of the first oscillator circuit being dependent upon said measurand;
• and
• circuitry arranged to receive said oscillating output signals and generate a first output signal, said first output signal being indicative of a number of cycles of one of the first and second oscillating output signals in a time period determined by a period of the other of said first and second oscillating output signals, further comprising a housing arranged to isolate, at least partially, the first component of the second oscillator circuit from said measurand.

A measurement apparatus comprising:

• a first oscillator circuit and a second oscillator circuit, each oscillator circuit being arranged to generate a respective oscillating output signal and comprising at least a respective first component having a property determining a respective output frequency of the respective oscillating output signal;
• a sensor configured to sense a measurand, the sensor comprising said first component of the first oscillator circuit, said property of said first component of the first oscillator circuit being dependent upon said measurand;
• and
• circuitry arranged to receive said oscillating output signals and generate a first output signal, said first output signal being indicative of a number of cycles of one of the first and second oscillating output signals in a time period determined by a period of the other of said first and second oscillating output signals, wherein each of the first and second oscillator circuits is an LC oscillator circuit.