What is the difference between the resistance mode of the multimeter and the buzzer mode for on-off measurements?
Multimetru rezistență și buzzer gear in the measurement of what is the difference between on and off many friends like to take the buzzer gear to determine the line on and off or equipment good or bad, there are many friends like to take the resistance gear to determine the line on and off or equipment good or bad. The question is, what is the difference between the multimeter resistance file and the the buzzer file in the measurement of on-off?
Diferența între ei este:
Multimetru rezistență fișier poate măsura the specific size of the line resistance, and then we can analyse the resistance size to determine if the line is normal or what faults exist.
The beeper can only judge the line resistance value is larger or smaller (general 30-50Ω or so as the cut-off point, different multimeter a little different).
Presupunând că the the critical resistance value of the multimeter beeper is 50Ω, then when the line or load resistance is less than 50Ω, the beeper will sound, and the smaller the resistance, the louder the beeper. But when the line or load resistance is greater than 50Ω more, the beeper will not sound. So when the line resistance is greater than 50Ω sau ∞, we use the beeper gear is no way to disting the
monofazat motor bun sau rău judecată
Know from the title of the motor has a total of 4 wires, then we can speculate that the motor should be a single-phase motor (specific what type of single-phase motor to see the physical in order to draw conclusions).
monofazat motoare au două bobină înfășurări, a start înfășurare și a rulare înfășurare. Because of the thicker coil of the running winding and the thinner coil of the starting winding, the resistance value of the starting winding is larger than that of the running winding. That specific resistance size and motor type, power related, more than ten ohms to one or two hundred ohms are possible. (The higher the motor power, the lower the resistance; the lower the power, the higher the the resistance)
Dacă the motor power is foarte mic, then its resistance value will be foart large, if the resistance value is greater than 50Ω, we use the buzzer file to measure the results is not ring. În mod similar, if the motor winding is burnt out, then we use the buzzer gear will not ring.
Dacă motor putere este mare, atunci ei rezistență valoare voi fi mic, dacă rezistența valoare este mai puțin decât 50 Ω, we use the buzzer gear measured results is a a bip. În mod similar, if there is a scurtcircuit in the middle of the motor winding, then the result we measured with the beeper gear is also a beep sound.
Deci acolo's într-adevăr nu way to tell if the motor is good or bad in the situation you're describing. To judge if the motor is good or bad, we need to analyse the motor resistance and power.
