Multimeter which conditions can burn out the
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 do not use it, we should make it a habit to set the multimeter to the highest voltage level, or set it to the shutdown file, in order to prevent forgetting to adjust the file and burning the multimeter, and do not measure the components with electricity, especially the power supply line of 220v or above, and must cut off the electricity when measuring the line.
Use to develop good habits, such as measuring voltage do not know how much voltage to put the highest gear first, each time the pen in contact with the measurement point must first look at the gear, to
prevent just after the measurement of the through the measurement of the voltage, the meter is still in the ohm file, in short, to develop good habits of use, the multimeter's life is a very long time.
There are several reasons why the multimeter burns, one, hit the resistance file 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 considered a minor fault, bad circuit board is considered burnt.
