Where is the multimeter used in daily life?
The basic function is to measure: resistance, AC and DC voltage, AC and DC current, on and off; expansion: capacitance, inductance, diode, triode. The multimeter has the advantages of multi-purpose, wide range and convenient use. It is the most commonly used tool in electronic measurement. It can be used to measure resistance, AC and DC voltage and DC voltage. Some multimeters can also measure the main parameters of transistors and the capacitance of capacitors. Mastering the use of a multimeter is an essential skill in electronic technology. Common multimeters include analog multimeters and digital multimeters. The pointer type multi-meter is a multi-function measuring instrument with the head as the core component, and the measured value is read by the pointer of the head. The measured value of the digital multimeter is directly displayed in the digital form by the LCD screen, which is easy to read, and some also have a voice prompt function. A multimeter is a meter that shares a meter head and integrates a voltmeter, an ammeter and an ohmmeter. The reading accuracy of the pointer meter is poor, but the process of the pointer swinging is relatively intuitive, and its swing speed can sometimes reflect the measured size objectively (such as measuring the slight jitter of the TV data bus (SDL) when transmitting data) ; The reading of the digital meter is intuitive, but the process of digital change looks messy and not easy to watch. There are generally two batteries in the pointer watch, one is 1.5V with low voltage, and the other is 9V or 15V with high voltage. The black test pen is the positive terminal of the red test pen. Digital meters usually use a 6V or 9V battery. In the resistance mode, the output current of the test pen of the pointer meter is much larger than that of the digital meter. Using the R×1Ω file can make the speaker emit a loud “click” sound, and the R×10kΩ file can even light up the light-emitting diode (LED). In the voltage range, the internal resistance of the pointer meter is relatively small compared to the digital meter, and the measurement accuracy is relatively poor.
