First, the measurement method of voltage:  
1. Measurement of AC voltage: Dial the multimeter to the AC voltage (ACV or V ~) file, select the appropriate gear, fail to predict the measured voltage value, adjust to the highest gear measurement, and then select the corresponding file according to the display value according to the display value. Position, readings are more accurate. During the measurement, the two tablets are connected to the two ends of the measured power supply regardless of each positive and negative.  
2. Measurement of DC voltage: Before the measurement, determine the positive and negative pole of the voltage, dial the multimeter to DC voltage (DCV or V-) gear, select the appropriate gear, bring the black table pen to the negative end of the power supply, red table pen, red table pen, red table pens The power supply is positive, and the pointer table cannot be mistaken to prevent the head from being broken. If it is a digital table, when the table is connected, the screen displays negative values.  
 
Second, current measurement method:  
The current has a distributed AC current and DC current. When measured, the corresponding gear should be selected (digital table AC current file a ~, DC current file A-, pointer table cannot measure the AC current), and some multimeter should also be replaced with the meter plug to the plug to A jack of A, the measurement method of the interchange, is the same, and the meter pens are connected to the measured circuit. Before the measurement, the current value should be predicted and the proper gear should be selected. When the measured current is greater than 500mA, the red table pen is inserted by 20A holes and dial to the 20A gear. During the measurement, disconnect the connection between the power supply and the load, and connect the red table pen to the end of the power supply supply, and the end of the black table pens to connect the load. If it is a DC current, the two tablets are connected on the power supply line of the positive power supply. If it is connected to the negative power line, the black table pen must connect the power supply end and the red table pen load.  
 
Third, the measurement method of resistance:  
Read the marker value on the resistor before measuring, the multimeter is dial to the resistor (Om ω) file, and select the gear close to the resistance value. During the measurement, the pointer table first briefly connects the two tablets, and adjust the fine -tuning button to make the table for 0 scale. The meter pen is measured by both ends of the resistor.