How to test the condition of a three-phase motor with a multimeter?
1, Measurement of Direct Current
1. Set the multimeter to direct current (DC A) measurement mode.
2. Choose a suitable range of measurement based on the magnitude of the current to be measured, generally selecting a range slightly larger than the current to be measured.
3. Insert the black test lead into the COM interface of the multimeter, and the red test lead into the mA or A interface.
4. Connect the red test lead to the positive pole of the circuit and the black test lead to the negative pole of the circuit.
5. Turn on the circuit switch where the current to be measured is located, and the current value is obtained by removing the decimal point before the measurement range.
2, Measurement of AC current
The measurement principle of AC current is similar to that of DC current, but it should be noted that the direction of AC current is constantly changing, and the appropriate AC current (AC A) measurement mode needs to be selected during measurement.
1. Set the multimeter to AC current (AC A) measurement mode.
2. Choose a suitable range of measurement based on the magnitude of the current to be measured, generally selecting a range slightly larger than the current to be measured.
3. Insert the black test lead into the COM interface of the multimeter, and the red test lead into the mA or A interface.
4. Connect the red test lead to the positive pole of the circuit and the black test lead to the negative pole of the circuit.
5. Turn on the circuit switch where the current to be measured is located, and the current value is obtained by removing the decimal point before the measurement range.
Three phase motors are common motors in industry, and measuring the quality of three-phase motors can be done through various methods. One common method is to use a multimeter to measure current and voltage.
Measuring the current of a three-phase motor is one of the important indicators for judging its quality. The operation steps are as follows:
a. Adjust the measurement mode of the multimeter to alternating current (AC A) measurement mode.
b. Select the current range and choose the appropriate range based on the rated current of the motor.
c. Connect the test leads of the multimeter to the three output terminals of the three-phase motor according to the wiring diagram to ensure correct wiring.
d. Turn on the three-phase motor and read the current value. If the current value is close to the rated current, it indicates that the motor is normal.
Measuring the voltage of a three-phase motor is also an important indicator for judging its quality. The operation steps are as follows:
a. Adjust the measurement mode of the multimeter to AC voltage (AC V) measurement mode.
b. Select the voltage range and choose the appropriate range based on the operating voltage of the circuit where the motor is located.
c. Connect the test leads of the multimeter to the three input terminals of the three-phase motor according to the wiring diagram to ensure correct wiring.
d. Open the circuit and read the voltage value. If the voltage value is close to the operating voltage, it indicates that the motor is normal.
