O digital multímetro é o mais comum usado digital instrument hoje. Its main features are high accuracy, strong resolution, complete test functions, fast measurement speed, intuitive display, strong filtering ability, low power consumption, and easy to carry. Since the 1990s, digital multimeters have become rapidly popularized and widely used in my country. Eles têm se torna um essencial instrumento para moderno eletrônico medição e manutenção trabalho, e são gradualmente substituindo tradicional analógico (ie, ponteiro) multímetros.
Digital multimeters, also known as digital multimeters (DMM), come in many types and models. Every electronic worker hopes to have an ideal digital multimeter. There are many principles for choosing a digital multimeter, and sometimes they even vary from person to person. But for a handheld (pocket) digital multimeter, it should generally have the following characteristics: clear display, high accuracy, strong resolution, wide test range, complete test functions, strong anti-interference ability, relatively complete protection circuit, and beautiful appearance , generous, easy to operate, flexible, good reliability, low power consumption, easy to carry, affordable and so on.
O principal indicadores, display dígitos e display características de digital multímetros
The display digits of a digital multimeter are usually {{0}}/2 digits to 8 1/2 digits. There are two principles for determining the number of display digits of a digital instrument: one is that the number of digits that can display all numbers from 0 to 9 is an integer number; the other is that the value of the fractional digit is based on the highest digit of the maximum displayed value. is the numerator, and the count value when using full scale is 2000. This shows that the instrument has 3 integer digits, and the numerator of the fractional digit is 1 and the denominator is 2, so it is called 3 1/2 digits, pronounced as "three and a half digits". ", its highest bit can only display 0 or 1 (0 is usually not displayed). The highest digit of a 3 2/3-digit (pronounced "three and two-thirds digit") digital multimeter can only display numbers from 0 to 2, so the maximum displayed value is ±2999. Under the same circumstances, it is 50% higher than the measurement limit of a 3 1/2-digit digital multimeter, which is especially valuable when measuring 380V AC voltage.
Popular digital multímetros são geralmente handheld multímetros com a 3 1/2 digit display. 4 1/2, 5 1/2 digit (abaixo 6 dígitos) digital multímetros são divididos em handheld e desktop types. Most of the 6 1/2 digits and above are desktop digital multímetros.
O digital multímetro adota avançado digital display tecnologia, com claro e intuitivo exibição e preciso leitura. It not only ensures the objectivity of readings, but also conforms to people's reading habits and can shorten reading or recording time. These advantages are not available in traditional analog (i.e. pointer) multímetros.
