It is convenient to use a multimeter or a megohmmeter to check the circuit
Check the AC and DC voltage of the line; it is convenient to use a pointer multimeter or set a multimeter for the on-off of the line.
If you check the AC current in the line, it is better to purchase a digital clamp meter for convenience.
Use a megohmmeter for the motors and cable wires that need to measure the insulation resistance for checking the circuit;
They determine the scope of use according to their functions, and the megohmmeter is the best choice for testing the insulation of electrical equipment; it cannot be replaced by a multimeter; because the resistance value of the insulation resistance of the tested electrical equipment is relatively large, all in several megohms Or more than tens of megohms, the scale of the multimeter is very inaccurate in this range. In addition, the power supply voltage used by the multimeter when measuring resistance is very low (below 9V), and the resistance value presented at low voltage cannot reflect the real value of insulation resistance under high voltage. Therefore, although the multimeter can also measure the insulation resistance value of several thousand ohms, the insulation resistance value measured by it can only be used as a reference. When testing the insulation resistance of electrical equipment, only a high voltage and low current megohmmeter (250~2500V) can be used for measurement, instead of a multimeter.
The multimeter is a multi-functional, multi-range portable instrument. According to different measurement principles and display methods, it can be divided into pointer multimeters and digital multimeters.
Multimeters can generally be used to measure DC current, DC voltage, AC voltage, resistance, level, etc., and some can also measure AC current, capacitance, inductance, and transistor magnification, so it is indispensable for electronic engineering, electromechanical and maintenance departments. It is a general-purpose tool and is widely used in electrical measurement.
The pointer multimeter, also known as the analog multimeter, is a multi-purpose measuring instrument with the meter head as the core component. The measured value is read by the pointer of the meter head, and it can continuously observe the dynamic changes of the measured object.
The digital multimeter is an instrument that integrates electronic technology and microcomputer technology. It uses a liquid crystal display to directly display the measured value, which fundamentally changes the circuit and structure of the traditional pointer multimeter. It has the advantages of small size, light weight, wide measurement range, It has the advantages of multiple measurement functions, intuitive readings, fast measurement speed, high measurement accuracy, high sensitivity, and strong overload capacity.
