Electrical circuit for temp. measurement - has temp. sensitive and fixed resistors connected in series and difference between voltage drops measured

摘要

The circuit comprises a first resistor whose resistance is affected by temperature. Voltage drop across this resistor, produced by a specified current (I) is measured, and the current (I) is measured by the voltage drop it produces across a second, fixed resistor in series with the first. Voltage drop across the first resistor (RT) is measured by connection in opposition to the voltage drop across the second resistor (RO) and the difference between the two voltages is then measured. The circuit arrangement may be used in a similar way to determine other physical values which may be evaluated in terms of an electrical resistance factor.