Basic Concepts and Structural Composition of a Digital Multimeter
In the field of electronic testing, multimeters are known as "all powerful warriors". Its powerful functionality and wide range of applications make it an indispensable measuring tool for electronic engineers, maintenance personnel, and technicians. This article will provide a detailed introduction to the basic concepts, structural components, and applications of a multimeter, taking you on a journey to appreciate its unique charm.
The basic concept of a multimeter
A multimeter, also known as a multimeter, multimeter, multimeter, multimeter, etc., is a portable electronic testing instrument used to measure physical quantities such as voltage, current, and resistance in circuits. It has advantages such as high precision, portability, ease of use, and safety, and is widely used in fields such as electronic device maintenance, circuit design, and experimentation. A multimeter typically consists of a digital display screen, selection knob, test leads, and measurement ports, capable of measuring direct current voltage (DCV), alternating current voltage (ACV), direct current (DCA), alternating current (ACA), resistance (Ω), and other additional functions such as capacitance, frequency, temperature, etc.
The structural composition of a multimeter
A multimeter mainly consists of three parts: the meter head, measuring circuit, and conversion switch.
Header: The header is the indicator part of a multimeter, usually using a magneto electric microampere meter as the header. The dial on the meter head is printed with various symbols, scale lines, and numerical values to indicate the measured values. The meter head contains a sensitive ammeter that can convert the measured current signal into a readable voltage signal, which can be displayed on the dial.
Measurement circuit: The measurement circuit is the core part of a multimeter, used to convert the measured current into a small DC current suitable for measurement by the meter head. It is essentially composed of a multi range DC ammeter, a multi range DC voltmeter, a multi range AC voltmeter, a multi range ohmmeter, and so on. These meters achieve switching between different ranges and measurement ranges through different circuit designs and selection switches.
Transfer switch: The transfer switch is a key component of a multimeter, used to select different ranges and measurement ranges in the measurement circuit. By rotating the conversion switch, users can select the physical quantities to be measured (such as voltage, current, resistance, etc.) and the corresponding range. The design of the conversion switch makes the multimeter multifunctional and multi range, which can meet different measurement needs.
