MULTICHANNEL RESISTIVE SENSORS RESISTANCE - VOLTAGE CONVERTER Russian patent published in 2009 - IPC G01R27/00 

FIELD: electricity.

SUBSTANCE: invention is attributed to technical facilities for measuring non-electrical values using electrical method. Multichannel resistive sensors resistance - voltage converter contains reference voltage source, four sources of weighted voltage, two constant current sources, bidirectional pulse current modulator, current switch through which resistive sensor and its resistive equivalent is fed, voltage-operated outputs of which are connected via voltage switch to differential input of instrumental operating amplifier. Output of instrumental amplifier is connected to input of analog-digital converter connected with microcontroller where control signals for converter are generated, measured signals are processed and digital equivalent of measurement result is formed.

EFFECT: error reduction due to lowering noise from active elements and their parameters stabilisation because of galvanic separation of power supplies and interference resistance increase due to using bidirectional current supply of resistive sensor and its resistive equivalent and using measurement signal processing algorithm in which additive components in measured signal are essentially excluded.

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