Program control self-adaption switching circuit of meter ranges and switching control method thereof

Abstract

The invention discloses a program control self-adaption switching circuit of meter ranges and a switching control method thereof. In a traditional measuring meter, the method of manually rotating a meter plate to switch the meter ranges is mostly used in the measuring process, and the problem that consideration can not be given to both the precision of the big meter ranges and the precision of the small meter ranges simultaneously is caused. The program control self-adaption switching circuit of the meter ranges and the switching control method thereof are characterized in that a first analog switch switching circuit and a second analog switch switching circuit are connected with the front stage and the rear stage of an operational amplifier respectively; the rear stage of the operational amplifier is further connected with the input end of an analog-to-digital converter; the output end of the analog-to-digital converter is connected with the input end of a microprocessor, and the output end of the microprocessor is connected with the first analog switch switching circuit and the second analog switch switching circuit. Self-adaption automatic switching of the meter ranges is achieved, the modes of manually checking meter display measuring data and manually switching the meter ranges are replaced, it can be guaranteed that the precision classes of all the meter ranges are the same, meanwhile, automatic measuring is achieved, and labor cost is lowered.

Description

technical field [0001] The invention relates to a program-controlled self-adaptive switching circuit of a metering range and a switching control method thereof. Background technique [0002] During measurement, in the case of a fixed meter range, it is technically difficult to ensure the measurement accuracy of the signal and take into account the measurement range of the signal. [0003] Most of the traditional measuring instruments use the method of manually rotating the dial to switch the range during measurement, which often results in that the accuracy of the large range and the small range cannot be taken into account at the same time. [0004] Take measuring voltage as an example. Generally speaking, for an unknown voltage to be measured, if you manually rotate the dial to switch the range, for example, before measuring the voltage, you don't know the size of the voltage to be measured in advance, so you can only put it in the maximum range and switch from large to s...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above problems, the object of the present invention is to provide a program-controlled adaptive switching circuit of the meter range, which realizes the self-adaptive automatic switching of the measurement range, to improve the degree of automation of the measurement, and to overcome the blindness of the manual gear shifting measuring instrument Inaccuracy and other shortcomings, reduce costs while improving accuracy and automation

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