Bagaimana untuk menggunakan multimeter untuk mencari litar pintas?
Short-circuit measurement is very common in electrical maintenance and component fault location. When measuring short-circuit faults, be sure to disconnect the power supply, and remember not to operate with power on. For short-circuit measurement, use the buzzer or ohm profile of the multimeter to measure. The buzzer is used to measure more intuitively. When the line is short-circuited, the multimeter will "buzz" directly. The principle of buzzer is when the measured resistance is less than about 75Ω, the multimeter A beep occurs. If you want to know the resistance value between the two lines more accurately, you can use the 200Ω measurement. Using the buzzer mode to measure, sometimes the actual internal resistance between the two signals is small, it is easy to misjudge, such as relay/contactor coil, many relays/contactor coil impedance is less than 75Ω, using the buzzer mode measurement will The buzzer sounds like a short circuit, but it doesn't.
Jurutera selalunya menggunakan buzzer multimeter untuk mencari dengan cepat-titik kerosakan litar garis atau komponen, seperti mengukur sama ada rintangan dan kapasitor berlitar-pendek, sama ada diod rosak secara terbalik ke bawah, sama ada triod dipecahkan (apabila triod dipecahkan, asas dan pemancar secara amnya pendek-litar), Sama ada terdapat litar pintas antara bekalan kuasa dan tanah cip litar bersepadu, sama ada terdapat litar pintas antara dua pin, dsb.
