digital multimeter range
The measurement process of the digital multimeter is converted into a DC voltage signal by the conversion circuit, and then the analog/digital (A/D) converter converts the voltage analog quantity into a digital quantity, and then counts through an electronic counter, and finally uses the digital measurement result. displayed directly on the display.
When measuring voltage, current and resistance with a multimeter, it is realized by converting the circuit part, and the measurement of current and resistance is based on the measurement of voltage, that is, the digital multimeter is extended on the basis of the digital DC voltmeter.
The digital DC voltmeter A/D converter converts the analog voltage that changes continuously with time into a digital quantity, and then counts the digital quantity by an electronic counter to obtain the measurement result, and then the decoding display circuit displays the measurement result.
The logic control circuit controls the coordinated work of the circuit, and completes the entire measurement process in sequence under the action of the clock.
The above is the comparison result of the error of the voltage measured by the multimeter. From the measurement result data, it can be seen that when choosing a multimeter, one is to look at the accuracy, and the other is to look at the range. Only when the two are combined can accurate data be measured.
