A few conditions under which a multimeter burns out
Multimeter in the measurement of high voltage, forget to convert the gear will burn the multimeter, such as resistance to measure 220v voltage, some multimeters have anti-burn protection, so we must use the multimeter when the first choice of gear range, look good and then go to measure, do not blindly pick up and go to use, do not use when we have to raise the multimeter to the voltage of the highest level, or adjusted to the closed file, in order to prevent forget to adjust the gear burned the multimeter, do not carry electricity to measure components, especially above 220v power supply line, the measurement line must be disconnected when the line passes through. When we don't use it, we should make it a habit to set the multimeter to the highest voltage level or turn it off in order to prevent forgetting to adjust the gear and burn the multimeter, and don't measure the components with electricity, especially the power supply line above 220v, and be sure to cut off the electricity when measuring the line.
Multimeter as long as the requirements of the normal service life is quite long, my MF47 is 1988 products with more than 30 years, (Product No. 8884454) use to develop good habits, such as measuring voltage do not know how much voltage to be the first to put the highest gear, each time the table pen in contact with the measurement point must be the first look at the gear, to prevent the measurement of just after the through the measurement of the voltage, the meter is still in the ohms file, in short, develop good habits, the multimeter is a good way to use the meter, the multimeter should not be used for measuring components, especially 220v above the power supply line, the measurement of line passes through the power supply must be disconnected. Good habits, the life of the multimeter is very long.
There are several reasons why the multimeter burns, one, hit the resistance gear to measure the AC, which is very dangerous, the meter will burn immediately. Second, the amount of AC voltage to measure the small voltage gear to measure the high voltage, this time the table will also burn, three is the pen inserted into the current measurement jack, not replaced to measure the voltage jack, the voltage gear to measure the voltage. Four is to measure the current and load in series and the multimeter can only measure the small current, so no series to measure will burn the table, even in series, more than the current will burn the table, but with the progress of science and technology, some of the multimeter has been a reliable protection device to reduce the possibility of burning the table!
1. Low voltage block to measure high voltage.
2. Small current block to measure high current.
3. Current block to measure voltage.
4. Resistance block to measure the voltage and current.
Nowadays, the multimeter is equipped with protection function, there are three fuses inside the open back case, which are voltage and current resistance. Protection of misoperation fuse broken. If it is a pointer, it may burn the dial or the needle. Because the instant voltage current is too large, the fuse did not have time to break. Bad fuse can only be regarded as a minor fault, bad circuit board is considered burnt.
