Direct voltage tester and method for testing direct voltage

Abstract

The invention discloses a direct voltage tester and a method for testing direct voltage. The direct voltage tester comprises a high-resolution analog-digital converter, a high-precision regulated power supply and a serial port output circuit. The high-precision regulated power supply and the serial port output circuit are respectively connected with the high-resolution analog-digital converter. The high-resolution analog-digital converter compares reference voltage of the high-precision regulated power supply with the received input voltage to obtain comparison data, and then converts the comparison data to digital signals and outputs the digital signals through the serial port output circuit. Because resolution ratio is very high and cost is very low, the selected analog-digital converter has very low rate of conversion, but measurement of stable direct voltage is not affected. Serial port output of digital signals can enable the voltage tester to be integrated with other systems conveniently. With the help of a single chip microcomputer or a master control computer, an input voltage value can be quickly obtained, utilized and calculated. Therefore, when the direct voltage tester is used, testing cost of direct voltage is remarkably reduced, structure is simple and precision is high.

Description

technical field [0001] The invention relates to the technical field of voltage testing, in particular to a high-precision and low-cost DC voltage tester and a method for testing DC voltage. Background technique [0002] Ordinary voltmeters are assembled with ammeters, and the internal resistance of the ammeter is very small. Then, a large resistor can be connected in parallel to two points where the voltage needs to be measured. According to the relationship of Ohm’s law, the current displayed by the ammeter It is proportional to the external voltage, so the voltage can be measured. In this measurement, errors are often caused by the ratio relationship between the input resistance and the output resistance. At the same time, because the voltmeter on the market is often integrated into the multimeter, or a single voltmeter also integrates many other functions, it is often expensive. Moreover, the voltmeter generally exists independently and is difficult to integrate into the...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems of error, high cost and difficulty in integrating into the system, the present invention provides a high-precision and low-cost DC voltage tester and a method for testing DC voltage

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