Kako koristiti multimetar za pronalaženje kratkih spojeva?
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.
Inženjeri često koriste zujalicu multimetra kako bi brzo pronašli -točku kvara u kratkom spoju linije ili komponenti, kao što je mjerenje jesu li otpor i kondenzator kratko-spojeni, je li dioda obrnuto slomljena dolje, je li trioda u kvaru (kada je trioda pokvarena, baza i emiter su općenito kratko-spojeni), postoji li kratki spoj između napajanja i mase čipa integriranog kruga, postoji li kratki spoj između dva kontakta itd.
