How to measure the quality of a water pump with a digital multimeter

When measuring the pump, put it firstMultimeterHit the AC current above 20A.

AC contactors.

It is a defective product, and one of the contacts is burned and dissolved, resulting in a phase loss. After the water was cut off, it was found that the well was boiling, and the power was cut off to check as soon as possible.

Enamelled wire for water pumps.

All use insulated plastic pipes to wear in water, not only heat dissipation, but also completely insulated, so how to confirm whether the pump motor is burned out, the following is the measurement method I used.

1. Although there is a lack of phase, it does not cause tripping, indicating that there is no leakage.

2. Submersible pump.

Most of them are star-type connections, and the resistance between each phase and the ground shall not be less than 0 5 trillion ohms, and the resistance between phases should be equal to the large.

3. There is only a multimeter and a voltage tester at hand, and the multimeter is played to 10k gear, and the resistance of each phase and the ground wire is measured.

Use the ohmic level to measure the resistance between the three phases, and measure the resistance between the three phases to forty or fifty ohms, and the resistance between the three phases is equal, which is in line with the resistance value of the enameled coil.

Summary. Measuring method for measuring the quality of the pump motor with a multimeter:

1.Measure the resistance of the motor winding: first use the multimeter resistance to measure the resistance of the motor coil.

If it is a three-phase motor, the resistance of the three-phase coil should be measured separately. The resistance value is normal in tens of ohms to thousands of ohms, and the three sets of data of the three-phase motor are similar to normal. The purpose of the measurement is to measure the quality of the motor winding coil, and to judge that there is a burning coil of the wireless, a short circuit between the motor slots, etc.

How to measure the quality of a water pump with a digital multimeter

Measuring method for measuring the quality of the pump motor with a multimeter:

1.Measure the resistance of the motor winding: first use the multimeter resistance to measure the resistance of the motor coil.

If it is a three-phase motor, the resistance of the three-phase coil should be measured separately. The resistance value is normal in tens of ohms to thousands of ohms, and the three sets of data of the three-phase motor are similar to normal. The purpose of the measurement is to measure the quality of the motor winding coil, and to judge that there is a burning coil of the wireless, a short circuit between the motor slots, etc.

2.Measure the insulation of the motor winding to the ground: use a multimeter to measure the resistance of the motor coil and the shell in 10k gear.

If it is a three-phase motor, the resistance of three sets of coils and the shell should be measured separately. One end of the multimeter is connected to the coil outlet, and the other end is connected to the motor shell, and the resistance value is more than 1m ohm (small power is above ohms) is normal. The purpose of the measurement is to check whether the motor has good insulation properties against the housing.

The multimeter can only be used to preliminarily judge whether the re-energizing test is normal under the condition of full compliance.

The use of a digital multimeter to measure the quality of the water pump is mainly to use the resistance measurement function of the multimeter.

First of all, you need to adjust the meter file of the multimeter to the resistance measurement (kiloohm file), and then take out the motor line of the two measuring meter pens to connect the pump, and observe the change of the multimeter needle after connection, if the meter needle is almost immobile, it indicates that the circuit resistance value is infinite at this time, and the circuit is open circuit fault at this time. If the watch hand swings directly to the head, it is a short-circuit fault of the water pump.

At the same time, if the multimeter needle is not at both ends during the measurement, it is about 45 degrees or 135 degrees, it means that there is no problem with the internal wiring of the pump. Then use a multimeter to measure the outer insulation of the pump, connect one pen to the motor line, and the other pen to the motor shell.

When measuring, pay attention to be sure to clean the paint to prevent poor contact, and then observe the change of the watch needle, if the watch needle does not move, it means that there is no problem with the external insulation of the water pump, if the watch needle swings, it means that the pump shell has leakage.

Use a digital multimeter to measure the fault of the pump motor, first check the insulation fault, and hit the multimeter at the highest gear to measure the ground resistance of each winding, if the resistance of a phase winding to the ground (shell) is less than 1 trillion ohms, it is a problem with the winding insulation, and the power cannot be sent at this time; Secondly, measure the insulation resistance between the windings and the windings (the multimeter is in the 200m range), if the resistance value between the three-phase windings is balanced, the pump is good, if it is unbalanced, it means that a certain winding is burned out.

According to the multimeter.

The working principle of detection, the specific process is as follows:

1. Before use, you should be familiar with the functions of the multimeter, and correctly select the gear, range and pen jack according to the object to be measured.

2. When the size of the measured data is unclear, the range switch should be placed at the maximum value first, and then switched from a large range to a small range, so that the instrument pointer can be indicated at more than 1 2 at the full scale.

3. When measuring the resistance, after selecting the appropriate magnification gear, the two table pens touch to make the pointer point at the zero position, if the pointer deviates from the zero position, the "zero" knob should be adjusted to make the pointer return to zero to ensure the accuracy of the measurement results. If it cannot be zeroed or the digital display meter sends out a low voltage alarm, it should be checked in time.

4. When measuring the resistance of a circuit, the power supply of the circuit under test must be cut off, and the live measurement must not be carried out.

5. When using the multimeter for measurement, it is necessary to pay attention to the safety of people and instrumentation equipment, and do not touch the metal part of the meter pen with your hands during the test, and do not allow the live switch to switch the gear switch to ensure accurate measurement and avoid accidents such as electric shock and burning the instrument.

How to measure the quality of the pump with 10,000 meters?

The pump motor is a single-phase motor, and there are two sets of coils in the motor, one is the main coil and the other is the secondary coil, also called the starting coil. The starting coil and the starting capacitor form the starting of the motor and the switching of the motor rotation direction, while the rotation direction of the water pump motor is a fixed rotation direction and does not need to be switched. The wiring diagram is as follows:

The quality of the pump motor can be measured with a multimeter. It is best to measure with an analog multimeter, if you don't have it, you can also use a digital multimeter to measure, the measurement method is the same, the method is as follows:

2. After measurement, the resistance value of these two sets of coils is almost the same, then this motor is good. If the resistance of these two sets of coils is very different, then this motor is bad, because there is an inter-turn short circuit phenomenon in the winding with small resistance.

3. Dial the meter to the measurement high resistance level, and measure the resistance value between the motor shell and the power input line with two meter pens (it is best to use a shake meter, that is, a megohmmeter). If there is a resistance value, it means that the motor has leaked electricity and cannot be used.

There is a multimeter resistance to measure the three-phase resistance of the motor, according to the size of the resistance to determine the quality of the pump, the normal three-phase motor three-phase resistance to meet the following conditions:

oneThe resistance between any two phases of the three phases should be equal, and the large motor is generally about a few ohms. If it is not equal, the deviation is acceptable within plus or minus three ohmsII. II. IIIt is any phase and cannot be short-circuited to the motor housing. If you are not satisfied, it means that the motor is broken.

Dear, hello, use a multimeter to test the quality of a 220v water pump, you need to follow the following operation steps: Precautions: Be sure to test after disconnecting the line to avoid electric shock.

Step 1: Select the resistance test setting of the multimeter (in most cases) and plug the test rod into the jack of the multimeter. Step 2:

Connect the test rod to the positive and negative electrodes of the battery, and observe whether the meter responds. If there is a reaction, it means that the test instrument itself is working normally. Step 3:

Find the input terminal and output terminal of the 220V water pump, connect the input terminal to the power supply when the power is on, and connect the output terminal to the 220V water pump. Step 4: Connect the test rod to the input and output terminals of the 220V water pump respectively, and observe whether the meter head responds.

If there is a reaction, it means that the circuit is unobstructed. Step 5: Connect the test rod to the two wires of the pump motor respectively (the wire ends can check the manual of the pump or the identification of the body), and measure their resistance values.

Step 6: Compare the rated resistance value of the pump motor (you can check the manual of the pump or the logo of the body) with the resistance value measured by the test. If the gap between the two is very large, it means that the pump motor is faulty.

The above is the steps to use a multimeter to test the quality of a 220V water pump, I hope it will be helpful to you.

The three-phase pump is measured with a multimeter: the pump coil can only be judged by measuring the voltage balance of the three-phase motor, and the single-phase cannot be compared for the time being.

The starting winding is connected in series with capacitors and centrifugal switches or other devices, so that the starting winding is disconnected from operation after the motor is running normally. During the measurement, the starting winding may be open and not passable, and it should be measured from the wiring of the centrifugal switch. The resistance of the main winding is less than that of the secondary winding, and the resistance of the starting winding is less than that of the running winding.

It is also important to note that the magnitude of the resistors is opposite for two different modes of operation.

Basic functionsThe multimeter can be used not only to measure the resistance of the object to be measured, but also to measure the AC and DC voltage. There are even multimeters that measure the main parameters of transistors and the capacitance of capacitors. Being proficient in the use of a multimeter is one of the most basic skills in electronic technology.