Getting Started with a Digital Multimeter
A digital multimeter is currently the most commonly used type of digital instrument. Its main features are high accuracy, strong resolution, complete testing functions, fast measurement speed, intuitive display, strong filtering ability, low power consumption, and easy portability. Since the 1990s, digital multimeters have rapidly become popular and widely used in China, becoming an essential instrument for modern electronic measurement and maintenance work, and gradually replacing traditional analog (i.e. pointer) multimeters.
Digital multimeters, also known as digital multimeters (DMMs), have a wide variety of types and models. Every electronics worker hopes to have an ideal digital multimeter. There are many principles for choosing a digital multimeter, and sometimes it may even vary from person to person. But for handheld (pocket sized) digital multimeters, they should generally have the following characteristics: clear display, high accuracy, strong resolution, wide testing range, complete testing functions, strong anti-interference ability, relatively complete protection circuit, beautiful and generous appearance, easy operation, flexibility, good reliability, low power consumption, easy portability, moderate price, etc.
Header
The head of a multimeter is a sensitive ammeter. The dial on the meter head is printed with various symbols, scale lines, and numerical values. The symbol A - V - Ω indicates that this electric meter is a multimeter that can measure current, voltage, and resistance. There are multiple scale lines printed on the dial, among which the resistance scale line marked with "Ω" on the right end is zero, and the left end is ∞. The distribution of scale values is uneven. The symbol "-" or "DC" represents direct current, "~" or "AC" represents alternating current, and "~" represents the common scale line between alternating current and direct current. The lines below the scale line represent the scale values corresponding to the different gear positions of the selector switch.
