Operational Methods and Protective Measures for Multimeters
A pointer multimeter should consist of a meter head, measuring circuit components, and a conversion switch. It comes in two forms: portable and pocket sized. The dial, zeroing knob, testing socket, etc. are installed on the panel. The functions of various multimeters are slightly different, but there are four basic functions: first, to test DC current, second, to test DC voltage, third, to test AC voltage, and fourth, to test AC/DC resistance. Some multimeters can measure audio level, AC current, capacitance, inductance, and special values of transistors. Due to these different functions, the layout of multimeters also varies!
In order to measure multiple types of electricity with a multimeter and have multiple ranges, it is necessary to convert the measured quantity into a direct current that can be connected to the magneto electric meter head through a measurement circuit. The more functions a multimeter has, the more complex its measurement circuit becomes. There are many resistors in circuits that test current, voltage, etc. In the circuit for testing AC voltage, there are rectifier devices, and in the measurement circuit for testing DC resistance, there should also be a dry battery as a power source~
The switch of the pointer multimeter is used to select switching devices for different measured and different ranges. It contains several fixed and movable contact points, and when the fixed and movable points are closed, the circuit can be connected. The fixed contact point is generally referred to as "throw", and the movable point is generally referred to as "knife". When switching, each blade and different throw are closed to form different measurement circuits. In addition, the number of blades and throws of various switching devices varies depending on their structure. The commonly used conversion switches for multimeters include four pole three throw, single pole nine throw, and eleven throw switches!
Basic usage method of multimeter
The types, numbers, and structures of multimeters are diverse. Only by mastering the correct methods can the accuracy of test results be ensured and the safety of both personnel and equipment be guaranteed!
