What is the difference between the resistance setting and the buzzing setting of a multimeter when measurement continuity?
Rezistența gama a a multimetrului poate măsura rezistența specifică a liniei linia , și apoi noi putem analiza și determina dacă linia este normală sau are orice defecte bazat pe rezistența .
The buzzer level can only determine if the resistance of the line is larger or smaller (general around 30-50Ω is used as the dividing point, and there are some differences between different multimeters).
Presupune că the critical resistance value for the multimeter's buzzer to emit a buzzing sound is 50Ω. Then, when the resistance of the line or load is less than 50Ω, the buzzer will sound, and the smaller the resistance, the louder the buzzer. But when the line or load resistance is greater than 50Ω, the buzzer will not sound. Prin urmare, when the the line resistance is greater than 50Ω or ∞, we cannot tell it using the buzzer mode.
Jurizarea calității a monofazatului motoarelor
De la the title, we know that the motor has a total of 4 wires, so we can infer that the motor should be a monofazat motor (the specific type of single-phase motor can only be concluded after seeing the real thing).
A monofazat motor are două bobină înfășurări% 2c unu este pornire înfășurare și celălalt este alergare înfășurare. Deoarece alergare înfășurare bobină este mai groasă și pornire înfășurare bobină este mai subțire% 2c rezistența a începutului înfășurării este mai mare decât aceea din alergare înfășurare. Specificul rezistența valoarea este legat de motorul modelul și puterea. Poate gama de la mai mult decât zece ohmi la unu sau doi sute ohmi. (The greater the power of the motor, the smaller the resistance; the smaller the power, the greater the resistance)
Dacă the power of the motor is foarte mic, its resistance will be foart large. If the resistance is greater than 50Ω, the result when we use the buzzer setting is that it does not sound. Similarly, if the motor winding is burned out, it will not sound when we use the buzzer setting.
Dacă the motor has a large power, its resistance will be foarte small. If the resistance is less than 50Ω, the result we measure with the buzzer setting is a buzzer. Similarly, if a short circuit apare in the middle of the motor winding, the result we measure using the buzzer gear will also be a buzzer.
Pentru electrician prieteni cine sunt nou la multimetre, I suggest that when using a multimetru to measure lines or loads, try to use the resistance mode instead of the buzzer mode. This is foarte util for repairing and mastering the multimeter. Only after you are proficient in using a a multimeter to measure resistance can you use the buzzer mode to speed up maintenance.
