Synthetic Resistance Meter Calibration Device

Abstract

The invention relates to a combined resistance type instrument calibration device. The combined resistance type instrument calibration device comprises a single-chip microcomputer unit, a keyboard unit, a displaying unit and a combined resistance control unit composed of a D / A switching circuit, a combined resistance output circuit, a proportional feedback circuit and a range switching control circuit. The keyboard unit, the displaying unit, the D / A switching circuit and the range switching control circuit are respectively connected with the single-chip microcomputer unit. The output end of the D / A switching circuit and the output end of the range switching control circuit are respectively connected with the input end of the combined resistance output circuit. The combined resistance output end of the combined resistance output circuit is connected with an instrument to be calibrated, one end of the proportional feedback circuit is connected with the combined resistance output end, and the other end of the proportional feedback circuit is connected with the D / A switching circuit. The specific value of the input voltage to the input current is obtained through programming, and programmable combined resistance output is obtained, the range is wide, the precision is high, the load capacity is strong, and the combined resistance type instrument calibration device is very good in universality and can meet demands for calibration of various resistance type sensor instruments.

Description

technical field [0001] The invention relates to an instrument calibrating instrument, in particular to a synthetic resistance instrument calibrating device. Background technique [0002] The input signal of many instruments is the resistance signal sent by the sensor. For example, the oil level sensor, pressure sensor, and temperature sensor of the automobile instrument mostly use resistive sensors. The resistance value varies with the oil level, oil pressure (air pressure), water temperature (or Oil temperature) changes, and the indicating instruments supporting these sensors, such as oil gauge, brake pressure gauge, water temperature gauge (oil temperature gauge), etc., are all designed according to the change of resistance. [0003] In the early stage of calibration of this type of instrument, several fixed resistances were used. Every time a type of sensor is replaced, a standard resistance must be replaced for simulation and calibration, which has poor versatility. Lat...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problems of large volume, cumbersome operation, low efficiency, poor versatility and low reliability of the original meter calibrator for calibrating resistive sensor meters; it provides a synthetic resistive meter calibrator The test device has a programmable resistance output, high precision, wide range of output resistance, good versatility, easy operation, high efficiency, good thermal stability, high reliability, and small size

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