SDM010 Digital voltage measuring instrument EPRO

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Overview

Essential details：SDM010 Digital voltage measuring instrument EPRO

In electricity measurement, voltage, current and frequency are the most basic three to be measured, of which voltage is the most frequently measured. And with the development of electronic technology, it is often necessary to measure high-precision voltage, so the digital voltmeter is an essential measuring instrument. DigitalVoltmeter (digital Voltmeter) referred to as DVM, it is the use of digital measurement technology, the continuous analog quantity into discontinuous, discrete digital form and display the instrument. The traditional pointer voltmeter has single function, low precision and inconvenient reading. Can not meet the needs of the digital age, the use of single-chip digital voltmeter, its high precision, strong anti-interference ability, strong scalability, easy integration, but also with PC real-time communication and other advantages. At present, the digital voltmeter composed of various monolithic A/D converters has been widely used in electronic and electrical measurement, industrial automation instruments, automatic test systems and other intelligent measurement fields, showing a strong vitality

SDM010

There are many types of DVM, classification methods are also many, there are digit points, such as 3/2-bit, 5-bit, 8-bit; There are points according to the measurement speed, such as high speed, low speed; There are points according to volume and weight, such as pocket-type, portable, desktop. However, DVM is usually divided into two categories according to the different A/D conversion modes, one is the direct conversion type, also known as the comparison type; The other type is the indirect conversion type, also known as the integral type, including the voltage-time transformation (VT transformation) and the voltage-frequency transformation (V-f transformation).
(1) Successive approximation comparison type Successive approximation comparison type voltmeter is used to compare the measured voltage with the decreasing reference voltage, and finally obtain the measured voltage value through comparison, and then send to the display. Although the successive comparison takes a certain amount of time, it can be completed after several beats, but as long as the speed of the beat is accelerated, it can still complete a measurement in an instant.
(2) voltage-time conversion type The so-called voltage-time conversion type means that the measured voltage value is converted into a time interval △t, the greater the voltage, the greater the △t, and then the timing pulse is counted according to the size of the △t, and the value is the voltage value. Voltage-time conversion type is also known as V-T type or ramp voltage type.
(3) voltage-frequency conversion type The so-called voltage-frequency conversion type refers to the measurement of the measured voltage value into a frequency value, and then use the frequency table to show the frequency value, that is, can reflect the size of the voltage value, this table is also called V-f type.

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