Under what conditions can a multimeter burn down?
When the multimeter is measuring high voltage, forgetting to switch gears will burn out the multimeter. For example, use the resistance mode to measure 220v voltage. Some multimeters have anti-burn protection functions, so when we use the multimeter, we must first select the gear range and be optimistic. Then measure again. Don't blindly pick it up and use it. When not in use, we must make a habit of adjusting the multimeter to the highest voltage level, or to the off level, in case we forget to adjust the level and burn out the multimeter. Do not charge the components when measuring them. When measuring, especially power supply lines above 220v, be sure to turn off the power when measuring the connection of the line.
As long as the multimeter can function normally as required, the service life is quite long. My MF47 was produced in 1988 and has been used for more than 30 years. (Product No. 8884454) You need to develop good habits when using it, such as measuring voltage but not knowing the voltage. The highest gear should be set first. Every time the test lead touches the measuring point, you must check the gear first to prevent the meter from measuring the voltage again after measuring the continuity. In short, develop good usage habits. The lifespan is very long.
There are several reasons for the multimeter to burn. 1. Turn to the resistance setting to measure AC. This is very dangerous. The meter will burn immediately. Second, when measuring the AC voltage, turn to the low voltage range to measure the high voltage, and the meter will burn out at this time. Third, insert the test lead into the current measuring jack, but not change it to the voltage measuring jack, so turn to the voltage range to measure the voltage. Fourth, measuring current must be connected in series with the load, and the multimeter can only measure very small currents, so the meter will burn if it is not connected in series. Even if it is connected in series, the meter will burn if the current exceeds it. However, with the advancement of technology, some multimeters have reliable protection. device, reducing the possibility of table burnout
1. Measure high voltage in low voltage mode.
2. Use small current to measure large current.
3. Current block to measure voltage.
4. Electrical barrier measures voltage and current.
Today's multimeters all have protection functions. When you open the back case, there are three fuses, which are voltage and current resistors. The protection fuse is blown due to misoperation. If it is a pointer, it may burn the dial or hands. Because the instantaneous voltage and current were too large, the fuse did not have time to blow. A broken fuse can only be considered a minor fault, and a broken circuit board can be considered a burnout.
