How to Use a Multimeter to Measure Leakage Current
The multimeter has two pens: red and black. When using, the red probe should be inserted into the socket marked with "+", and the black probe should be inserted into the socket marked with "-".
The main performance indicators of a multimeter mainly depend on the performance of the meter head. The sensitivity of the meter head refers to the DC current value flowing through the meter head when the pointer of the meter head deflects at full scale. The smaller this value, the higher the sensitivity of the meter head. The greater the internal resistance during voltage measurement, the better its performance.
1. The gear position should be consistent with the type of current being measured. Choose the correct gear based on the AC/DC type of current you want to measure, with AC corresponding to the AC gear and DC corresponding to the DC gear;
2. Choose a suitable range, otherwise it is highly likely to cause the multimeter to burn down. If you do not know the magnitude of the measured current, you should choose the maximum range. For example, a digital multimeter with a 20 ampere range can measure a current of 4.4 kilowatts of electricity;
3. Connect the multimeter in series to the live wire of the electrical appliance. To do this, the first step is to turn off the electrical switch. The second step is to unplug the plug and connect the meter in series; The third step is to plug in the plug and then close the switch. At this point, the reading of the multimeter is both the desired value.
Attention: Using this method to measure current in high-power appliances is very dangerous and can easily burn the meter. It is recommended to use a clamp type ammeter. This way, it is both safe and easy to operate.
Digital multimeters are relatively simple measuring instruments. In this article, the author will teach everyone the correct use of digital multimeter. Starting from the measurement methods of voltage, resistance, current, diode, transistor, MOS field-effect transistor, etc. of a digital multimeter, we will help you better master the measurement methods of a multimeter.
Before use, you should carefully read the relevant user manual and familiarize yourself with the functions of power switches, range switches, sockets, and special sockets. Place the ON/OFF switch in the ON position and check the 9V battery. If the battery voltage is insufficient, it will be displayed on the display. At this point, the battery needs to be replaced. If the monitor does not display, follow the steps below.
The symbol next to the test pen socket indicates that the input voltage or current should not exceed the indicated value, in order to protect the internal circuit from damage. Before testing. The function switch should be placed in the desired range.
