Kaip naudoti multimetrą trumpiesiems jungimams rasti?
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.
Inžinieriai dažnai naudoja multimetro garsinį signalą, kad greitai surastų linijos ar komponentų trumpojo{0}}jungimo gedimo tašką, pvz., išmatuotų, ar varža ir kondensatorius yra trumpai sujungti{1}}, ar diodas yra atvirkščiai sugedęs. sugedęs, ar sugedo triodas (sugedus triodui, bazė ir emiteris paprastai yra trumpai sujungti), ar nėra trumpojo jungimo tarp maitinimo šaltinio ir integrinio grandyno lusto žemės, ar nėra trumpojo jungimo tarp dviejų kontaktų ir pan.
