Precautions for measuring DC resistance with a multimeter
1. Range selection
If the range is selected to be small, the display will display "1.", and a larger range should be used at this time; on the contrary, if the range is selected to be large, a number close to "0" will be displayed on the display, at this time, it should be replaced Use a smaller range.
2. How to read
The number displayed on the display plus the unit selected by the upper and lower gears is its reading. It should be reminded that the unit is "Ω" in the "200" block, the unit is "KΩ" in the "2K~200K" block, and the unit is "MΩ" in the "2M~2000M" block.
3. If the measured resistance value exceeds the maximum value of the selected range, the over-range "1." will be displayed, and a higher range should be selected. For resistances greater than 1MΩ or higher, the reading will be stable after a few seconds. is normal.
4. When not well connected, such as open circuit, the meter displays "1.".
5. When checking the impedance of the line under test, make sure to remove all power supplies in the line under test and discharge all capacitors. If there are power supply and energy storage elements in the line under test, it will affect the correctness of the line impedance test.
6. During the measurement, you can touch the resistance with your hands, but do not touch both ends of the resistance with your hands at the same time - the human body is a conductor with a large resistance, but the resistance is limited.
