The detailed use of a mechanical multimeter
Mechanical multimeter, also known as analogue multimeter, pointer multimeter, is the earliest detection of electrical equipment, divided into resistance file, current file, voltage file.
Among them, the current and voltage file is divided into DC and AC file, AC voltage is not divided into positive and negative, such as detecting 220v household alternating current, only need to dial the gear to the 250v file or 500v file, check the pointer pendulum, the second grid on the dial for the current and voltage file, 220v used in the 250 file should be swung to between 250 and 200.
500v gear is to view the following 50 table position, 220v should be in 20 more than 2/3 grid, and then multiplied by 10, and no digital table is accurate, but you can be sure that the voltage is normal. 1000v gear to view the 10 position, the third, 220v in 2 a little bit later, the reading can be multiplied by 100.
DC voltage is divided into positive and negative, in which the red pen for positive, black pen for negative, do not get it wrong, otherwise the needle anti-indication, long-term damage to the table. Detection of two or three-stage tube is vice versa, this time the black pen is positive, red pen is negative.
The current file is not used much, can be strung into the circuit, skipped.
Resistance gear used more widely, but also the reason why the digital table is slightly worse than the pointer multimeter, but the need to adjust the zero, this point is the most annoying, and less durable than the digital table, fragile and breakable. However, the detection of wiring and electronic components leakage than the digital table, hit 10k gear, basically solve most of the wiring leakage problem.
The method of use is to hit a certain resistance level, the first zero, such as 1k file, where the pointer is multiplied by 1k can be, the other file is also the same. If the pointer back to zero, and then hit the 100 or 10 gears. Most of the pointer meter does not have a beeping gear, choose 1 gear can judge the wire through the off. You can also detect capacitors, diodes, power tubes and other electronic components, specific details will not repeat, Baidu search.
