There are two methods to measure the quality of the heating tube:
1. The resistance of the multimeter X1 is measured on the two terminal posts. The resistance value should generally be within a few hundred ohms. Depending on the working voltage and power, there is a difference but not much;
2. Use the resistance file above X10k to measure the resistance between any wiring pile head and the shell. It should be infinite; after use, due to moisture and other reasons, there may be a certain resistance value measured between the heating wire and the shell with a shaker. , But the resistance should be above 40M, otherwise the safety will be problematic.
Extended information:
The multimeter can be used not only to measure the resistance of the object being measured, but also to measure the DC voltage with AC and DC voltage. Even some multimeters can also measure the main parameters of transistors and the capacitance of capacitors. Fully proficient in the use of multimeter is one of the most basic skills of electronic technology.
Common multimeters are analog multimeters and digital multimeters. The pointer multimeter is a multi-function measuring instrument with a meter head as the core component, and the measured value is read by the pointer of the meter head. The measured value of the digital multimeter is directly displayed in digital form on the LCD screen, which is easy to read, and some also have a voice prompt function. The multimeter is a common meter, which integrates a voltmeter, ammeter and ohmmeter.
The DC current range of the multimeter is a multi-range DC voltmeter. The meter head can expand its voltage range by connecting closed-circuit voltage divider resistors in parallel. The DC voltage range of the multimeter is a multi-range DC voltmeter. The voltage divider resistor in series with the meter head can expand its voltage range. The voltage divider resistance is different, the corresponding range is also different. The meter head of the multimeter is a magnetoelectric measuring mechanism, which can only pass direct current and use diodes to change alternating current into direct current, thereby realizing alternating current measurement.
