Classification and Operating Instructions for Digital Multimeters
Digital multimeters can be classified into three types based on range conversion: manual range (MAN RANGZ), automatic range (AUTO RANGZ), and automatic/manual range (AUTO/MAN RANGZ).
According to different functions, uses, and prices, digital multimeters can be roughly divided into 9 categories:
Low end digital multimeter (also known as popular digital multimeter), mid-range digital multimeter, medium/digital multimeter, digital/analog hybrid instrument, digital/analog dual display instrument, multimeter (integrating digital multimeter, digital storage oscilloscope, etc.).
Testing function of digital multimeter
The digital multimeter can not only measure DC voltage (DCV), AC voltage (ACV), DC current (DCA), AC current (ACA), resistance (Ω), diode forward voltage drop (VF), transistor emitter current amplification factor (hrg), but also measure capacitance (C), conductance (ns), temperature (T), frequency (f), and has added buzzer mode (BZ) and low-power method resistance mode (L0 Ω) for checking circuit continuity. Some instruments also have the functions of inductance mode, signal mode, AC/DC automatic conversion, and capacitance mode automatic range conversion.
Most digital multimeters have added the following novel and practical testing functions: HOLD, LOGIC, TRMS, REL Δ, AUTO OFF POWER, etc.
Anti interference capability of digital multimeter
Simple digital multimeters commonly use the principle of integral A/D conversion,
