Portable numerical control resistance signal source and signal production method

Abstract

The invention discloses a portable numerical control resistance signal source. An input unit of a human-computer interaction interface of the portable numerical control resistance signal source is used for setting input of a resistance value, the output end of the input unit is connected with a microcontroller unit (MCU), the input unit is used for transmitting the set resistance value to the MCU,the MCU is used for calculating the set resistance value according to a relay switch array solving algorithm to obtain a relay set driving sequence and transmitting the relay set driving sequence toa relay driving unit, and the relay driving unit is used for driving a relay resistor network according to the relay set driving sequence so as to enable power-on resistors in the relay resistor network to be connected into a circuit to output the resistance value externally. The resistance signal source has the advantages of being small in size, high in precision, wide in application range, convenient to operate and the like compared with a traditional resistance source.

Description

technical field [0001] The invention relates to the technical field of an automatic test system and a signal source, in particular to a portable digitally controlled resistance signal source and a signal generating method. Background technique [0002] The resistance box is a commonly used signal source, and the high-precision resistance signal source is often used in the calibration of multimeters and resistance sensors. At present, there are mainly three types of resistance signal sources, traditional knob-type resistance box, electronic synthesis resistance and traditional relay switching resistance network resistance signal source. The traditional knob-type resistance box is bulky, only supports manual adjustment, cannot realize numerical control, and cannot be integrated into the field of automatic testing. The electronic synthesis resistor uses an active two-port network to simulate the ohmic characteristics of the resistor, which can realize the output of the variabl...

AI Technical Summary

Problems solved by technology

The traditional knob-type resistance box is bulky, only supports manual adjustment, cannot realize numerical control, and cannot be integrated into the field of automatic testing

The electronic synthesis resistor uses the active two-port network to simulate the ohmic characteristics of the resistor, which can realize the output of the variable resistor with high precision, but the active two-port network is not suitable for the use of AC excitation or intermittent excitation, or with the secondary instrument The excitation circuit does not match and other occasions

The way of switching the resistance network of the traditional relay can realize the resistance completely equivalent to the impedance of the sensor, which can solve the problem of the mismatch between the two active ports. Switching resistor networks cannot achieve high-precision resistance output

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