万用表使用方法说明（Multimeter usage instructions）.doc

万用表使用方法说明（Multimeter usage instructions） Multimeter is used to measure AC and DC voltage, resistance, DC current and other instruments. Its an essential tool for electrical and radio production. At first glance the multimeter is very complicated, in fact it is from the current table (commonly known as the header), dial, pen, etc. the range switch. When in use, if the range selector switch points to the DC current range, the ammeter M and some shunt resistors are used to achieve the purpose of enlarging the range, making it a ammeter with several different sizes and ranges. The measurement results will depend on the DC current scale on the dial to read the readings. Usually second action current scales on a dial. Similarly, if the range selector switch points to the DC voltage range, the meter string is connected with some other resistors (using the principle of partial resistance of the series resistor to make it a multi pass voltmeter). Reading depends on the DC voltage scale on the dial. Most meters use a scale for voltage and current. If a rectifier is connected to the circuit measuring the DC voltage, the AC voltage can be measured. The principle of measuring resistance is similar to measuring DC voltage, but it needs to add a battery when testing. When the selection switch points to the resistance range, the first scale of the line resistance is read on the dial scale. There are many types of meters, but their basic uses are the same. The MF30 multimeter is used as an example to introduce its using method. Before use, first, use the meter before you must be familiar with the function of the range selector switch. Define what to test and how to measure, then dial the range selector switch in the position where the test file is needed. Never make a mistake. For example: when the voltage is measured, the switch is mistakenly switched on the current or resistance file, so that the meter can be burnt out easily. Second, before using the hands look at zero mean. If n