What distinguishes a multimeter from a megohmmeter?
1. There is a difference in composition structure:
Medium and large size integrated circuits make up the megohmmeter. This meter provides several output voltage levels, a wide range of output power, and high short-circuit current values (each model has four voltage levels).
The measurement circuit, changeover switch, and meter head are the three basic components of the multimeter.
2. A different operating principle applies:
By stimulating the device or network being tested with voltage and then measuring the current it produces, a megohmmeter applies Ohm's law to determine resistance.
A sensitive magnetoelectric DC ammeter (microampere meter) is used as the multimeter's meter head, according to its core operating principle. There will be a current indication when a very modest current flows through the meter head.
3. The use is varied in scope:
Electric power, post and telecommunications, communications, electromechanical installation and maintenance, and industrial enterprise departments that use electricity as industrial power or energy frequently use and depend on megohmmeters. It is appropriate for determining the insulation resistance of transformers, motors, cables, and other electrical equipment as well as the resistance value of various insulating materials.
In addition to measuring the measured object's resistance, the multimeter can also measure the DC voltage. Even the fundamental characteristics of transistors and the capacitance of capacitors can be measured by some multimeters.
