Is it easier to check the wiring with a multimeter or a megohmmeter?
If checking the AC current in the line, it is best to acquire another piece of digital clamp meter is more convenient.
Check the line needs to measure the insulation resistance of the motor, cable wires, etc. using megohmmeter;
They are in accordance with the function to determine the scope of use, and megohmmeter used to detect the insulation of electrical equipment is the best choice; it is the multimeter can not be replaced; because the insulation resistance of the electrical equipment to be detected resistance value is relatively large, are in a few megohms or dozens of megohms more than in this range of the multimeter's scale is very inaccurate. In addition, the multimeter in the measurement of resistance when the power supply voltage is very low (9V or less), the resistance value presented in the low voltage, and can not reflect the role of the insulation resistance in the high voltage of the true value. Therefore, although the multimeter can also be measured in thousands of ohms of insulation resistance value, but it is measured insulation resistance value can only be used as a reference only. When testing the insulation resistance of electrical equipment, only high voltage and small current megohmmeter (250~2500V) can be used to measure, but not the multimeter.
Multimeter is a multi-functional, multi-range portable instrument, according to the measurement principle and display mode is different, it can be divided into pointer multimeter and digital multimeter.
Multimeter can be used to measure DC current, DC voltage, AC voltage, resistance, electricity and so on, some can also measure AC current, capacitance, inductance and transistor amplification, so it is electronic engineering, electromechanical and maintenance departments indispensable general-purpose tools, more widely used in electrician measurement.
Pointer multimeter, also known as analogue multimeter, is a kind of multi-purpose measurement instrument with the head as the core component, the measurement value is read by the head pointer indication, it can continuously observe the dynamic changes of the measured, MF47 type pointer multimeter as shown in the figure below.
Digital multimeter is a comprehensive electronic technology and microcomputer technology instrument, it uses the liquid crystal display to directly display the measured value, fundamentally changed the traditional pointer multimeter circuit and structure, has a small size, light weight, wide measurement range, measurement function, intuitive reading, fast measurement speed, high accuracy, high sensitivity, overload capacity and other advantages.
