What is the difference between a megger and a multimeter?
1. The composition structure is different:
The megohmmeter is composed of medium and large scale integrated circuits. This meter has large output power, high short-circuit current value, and multiple output voltage levels (each model has four voltage levels).
The multimeter is composed of three main parts: meter head, measuring circuit and changeover switch.
2. The working principle is different:
A megohmmeter uses Ohm's law to measure resistance by exciting the device or network under test with a voltage and then measuring the current generated by the excitation.
The basic principle of the multimeter is to use a sensitive magnetoelectric DC ammeter (microampere meter) as the meter head. When a small current passes through the meter head, there will be a current indication.
3. The scope of use is different:
Megohmmeters are commonly used and indispensable instruments in electric power, post and telecommunications, communications, electromechanical installation and maintenance, and industrial enterprise departments that use electricity as industrial power or energy. It is suitable for measuring the resistance value of various insulating materials and the insulation resistance of transformers, motors, cables and electrical equipment.
The multimeter can be used not only to measure the resistance of the measured object, but also to measure the DC voltage. Some multimeters can even measure the main parameters of transistors and the capacitance of capacitors.
