The realization principle of the automatic range multimeter_The meaning of each button of the automatic range multimeter?
Digital multimeter manual range has higher manual precision and faster measurement speed. For a digital multimeter with an automatic measurement range, as long as you select voltage, current, resistance, etc., the gear will automatically switch according to the specific measurement value during measurement. It is convenient to use, and you don't have to worry about damaging the multimeter with the wrong range. Digital multimeter, a multi-purpose electronic measuring instrument, generally includes functions such as ammeter, voltmeter, and ohmmeter, and is sometimes called a multimeter, multimeter, multimeter, or three meters. DMMs are available as portable units for basic troubleshooting, as well as benchtop units, some of which can go up to 7 or 8 digits of resolution. A digital multimeter is an electronic instrument used for electrical measurements. It can have many special functions, but its main function is to measure voltage, resistance and current. As a modern multifunctional electronic measuring instrument, it is mainly used in the measurement fields of physics, electricity and electronics.
Digital multimeter repair method
1. Feeling method: Use the senses to directly judge the cause of the fault. Through visual inspection, you can find disconnection, desoldering, short circuit of ground wire, disconnection of fuse tube, burnout of components, mechanical damage, warping of copper foil, fracture of printed circuit, etc.; temperature of batteries, resistors, transistors, and integrated blocks can be touched Lift. And refer to the circuit diagram to find out the cause of abnormal temperature rise. In addition, you can also check whether the components are loose, whether the pins of the integrated circuit are firmly inserted, whether the transfer switch is stuck; whether there are abnormal sounds and odors can be heard and smelled.
2. Voltage measurement method: measure whether the working voltage of each key point is normal, and quickly find out the fault point. For example, measure the operating voltage and reference voltage of the A/D converter.
⒊Short-circuit method: In the detection method of the above-mentioned a/d converter, the short-circuit method is generally used, which is often used in the maintenance of weak current and microelectronic instruments.
4. Open circuit method: Disconnect the suspect component from the entire machine or unit circuit. If the fault disappears, the fault is in an open circuit. This method is mainly suitable for short circuits.
5. Measuring element method: When the fault is reduced to a certain place or several parts, it can be measured online or offline. Replace with a good part if necessary. If the fault goes away, the part is bad
It depends on whether you are studying, or have mastered a little technology and are working. If you are learning, it is recommended not to buy automatic ones, because manual ones can cultivate your excellent skills. Of course, if it is already working, you can still consider an auto-ranging multimeter.
Advantages of automatic range multimeter: As a user, there is no need to manually select the range, which saves the process of range selection; the process of automatic range conversion function is realized by program control hardware, eliminating the need for selection knobs, so that the measurement process more convenient. and...
Detailed introduction: Features: 1. New anti-vibration sleeve, streamlined design, comfortable hand feeling; 2. Metal shielding plate, anti-magnetic, strong anti-interference ability; 3. Automatic power off after 15 minutes of stop using and the automatic range before power off is the largest Display 3999 LCD size 70×50mm Power 9V battery
1v=1000mv Do the math yourself. If the multimeter is not broken, it can only mean that your mobile phone battery is dead or broken.
Auto-ranging power supplies continuously adjust the range to deliver more current at more voltage settings. Detailed explanation: A single-range power supply is the simplest architecture. It has only one setting to provide maximum output power, that is, when both voltage and current are at their maximum. If the voltage is the same. The automatic range also needs to change the range, but it is automatic. It is possible to measure the inductance and capacitance with a general meter in occasions with low requirements, but due to the limitation of the measurement method, it is not possible to measure the quality of the capacitance in all directions. For accurate measurements, you can use...
It depends on whether you are studying, or have mastered a little technology and are working. If you are learning, it is recommended not to buy automatic ones, because manual ones can cultivate your excellent skills. Of course, if it is already working, you can still consider an auto-ranging multimeter.
