Which gear to test the car leakage multimeter

Hello, 1. Choose the right gear. Multimeter.

There is a gear for measuring voltage, resistance and current, and the meter must be selected to measure the current gear for measuring car leakage.

So it ends up in the DC current range.

2. Select the range. When measuring the current, it is necessary to choose the gear range from large to small, if the range is too small, the multimeter will be burned out, so it is necessary to choose the appropriate range from large to small, the range of the general car is selected at 10A, and now there are many tables that can automatically adjust the range size, as long as the gear is selected correctly.

3. Open the cover of the vehicle to be measured, turn off all the electrical equipment on the car, and then lock the door.

4. Use the corresponding wrench.

Remove the negative pole of the battery, and then connect the adjusted red watch pen of the multimeter with the iron wire of the body, and connect the black watch pen with the negative pole pile head of the battery.

5. After the above operation is completed, wait for 30 seconds, read the value on the multimeter to judge whether the car has a leakage fault, now there are more electrical equipment on the car, and the dark current is normal below 50 mA, if it is greater than 50 mA, then the leakage equipment should be checked.

Hope, thank you.

The multimeter uses these 2 gears to measure leakage, and the leakage of the live wire or the leakage of the neutral line can be known by one measurement.

Multimeter. Resistance and voltage to determine whether there is leakage.

Live measurement: use the multimeter 250 volts AC voltage file, measure the metal shell of the electrical appliance suspected of leakage, one meter pen is connected to the shell, and the other meter pen is grounded (or faucet), when the pointer shows that the voltage is higher than 30-50 volts, change to AC 50 volts, if the power supply is confirmed to be higher than 30 volts is leakage, and less than 30 volts is normal, and then the zero, fire power supply plug wire is adjusted and measured again to determine.

Use caution

Before using the multimeter, it should be "mechanically zeroed", that is, when there is no measured power, the multimeter pointer should be pointed at the position of zero voltage or zero current.

In the process of using the multimeter, do not touch the metal part of the watch pen with your hands, so that on the one hand, you can ensure the accuracy of the measurement, and on the other hand, you can also ensure personal safety. When measuring a certain amount of electricity, it is not possible to change gears at the same time as the measurement, especially when measuring high voltage or high current. Otherwise, the multimeter will be destroyed.

If you need to change gears, you should disconnect the watch pen first, and then go to measure after changing gears.

The multimeter measures leakage with voltage levels. The multimeter uses the voltage range to measure the leakage, hit the digital multimeter to the AC voltage range, turn off the electrical load, test whether there is voltage on the socket, if there is a voltage, it means that there is a risk of leakage. The second method can also be done by placing the digital multimeter's gear on the 200 stop of the ohm, with one probe placed on one of the two outgoing wires on the load side, and the other probe touching the wall, preferably touching the ground or temporary ground.

When the number displayed on the multimeter is stable, the insulation resistance value of the main line is read. If the insulation resistance value is less than a megaohm, there is a problem with the main line. If the insulation resistance is above the megaohm, it can rule out the problem with the main line.

Measure the other wire in the same way and check the value to see if there is a problem with the main line.

When the electrical equipment is charged due to insulation damage and the shell is live, and the staff comes into contact with the shell, it will lead to personal electric shock accidents. At this time, a part of the ground current will flow through the human body, and its value will cause the ** of the staff when it reaches a certain level. It is a more serious personal shock for a worker to touch the core wire that punctures the outer sheath of the rubber sheath cable and is exposed to the air, at this time, most of the ground current flows through the human body, so the danger to the staff is greater.

The battery inside the multimeter is 9V to 15V, and the resistance and voltage levels can only determine the short circuit, and roughly judge whether there is leakage.

Live measurement: use the multimeter 250 volts AC voltage file, measure the metal shell of the electrical appliance suspected of leakage, one meter pen is connected to the shell, and the other meter pen is grounded (or faucet), when the pointer shows that the voltage is higher than 30-50 volts, change to AC 50 volts, if the power supply is confirmed to be higher than 30 volts is leakage, and less than 30 volts is normal, and then the zero, fire power supply plug wire is adjusted and measured again to determine.

Measure the car leakage multimeter gear.

1. Choose the correct gear. There is a gear for measuring voltage, resistance and current on the multimeter, and the meter must be selected to measure the current gear for measuring the leakage of the car.

2. Select the range. When measuring the current, it is necessary to choose the gear range from large to small, if the range is too small, the multimeter will be burned out, so it is necessary to choose the appropriate range from large to small, the range of the general car is selected at 10A, and now there are many tables that can automatically adjust the range size, as long as the gear is selected correctly.

In fact, the cause of leakage is that the power supply hits the housing.

In this case, the resistance between the power supply and the housing is measured with a resistance step.

When the power is off, use the one with the largest resistance range, and judge whether there is leakage by looking at the degree of pointer swing or the size of the displayed number. However, the multimeter is not accurate in measuring leakage, and it is best to use a shake meter to detect leakage.

Test leakage insulation or use a megohmmeter accurately! The multimeter is too low for measuring insensitivity! Or it can't be measured directly!

In the case of power-on, use the AC voltage to measure the voltage of the equipment to the ground. In the case of a power failure, the resistance to the ground of the energized part is measured with an electrical barrier.

Yes, it's too professional, I can't do anything, I'll figure it out for myself.

), should show resistance infinity, otherwise leakage. 2. Live measurement: use the multimeter 250 volts AC voltage file, measure the metal shell of the electrical appliance suspected of leakage, one meter pen is connected to the shell, and another meter pen is grounded (or faucet), when the pointer shows that the voltage is higher than 30-50 volts, change to AC 50 volts, if the power supply is confirmed to be higher than 30 volts is leakage, and less than 30 volts is normal, and then put zero and fire in full text.

The highest range with a resistor range.

The test voltage of the multimeter is too low, and the megohmmeter is used for the purpose of measuring the insulation resistance normally.

If you use a multimeter to measure the battery voltage, you can directly adjust it to the DCV1000 level, that is, you can adjust it to the DC voltage level to measure. Moreover, the multimeter and the battery to be measured should be prepared when measuring, and the meter that can measure the voltage should be selected for the multimeter.

The specific method of measuring the battery voltage with a multimeter:

1. First adjust the multimeter to the DC voltage level, and then directly adjust it to the DC voltage of 1000V.

2. Then put the red pen on the positive pole of the battery, and the black pen on the negative pole, remember not to put it upside down, so that the energy can produce voltage;

3. Finally, the data can be read directly, and the reading of the digital multimeter is relatively simple, regardless of the unit, the data can be read directly in the display screen.

Multimeter measurement range, in a multi-function digital multimeter, different functions have their corresponding maximum and minimum values that can be measured. When the size of the measured data is unclear, the range switch should be set to the maximum value first, and then switch from a large range to a small range, so that the instrument pointer can indicate more than 1 2 at the full scale.

The leakage level of the multimeter is: RX10K.

The detection method is: first turn off all electrical appliances, use the RX10K file on the multimeter, one meter pen is connected to the fire line, and the other meter pen is grounded. When the resistance is infinite, it means that there is no leakage in the circuit.

When measuring the resistor, the power supply of the circuit under test must be cut off before proceeding, and the metal part of the pen must not be touched by the hand. When measuring DC, it is necessary to pay attention to the polarity of the table pen to be correct, and to do a good job of insulation protection measures.

Precautions for multimeters:

1. "Mechanical zeroing" before use.

Before use, the multimeter should be adjusted to zero, and the balance spring of the meter head should be adjusted without power, and the pointer should be pointed to the zero position. Carefully observe whether the pointer coincides with the zero tick mark, and if not, readjust it, otherwise it will affect the reading.

2. It is strictly forbidden to touch the metal part of the watch pen with your hands.

When using the multimeter, it should be connected with a watch pen, and the metal position of the watch pen should not be directly touched with your hands, otherwise the measurement results will be affected and an electric shock will be caused.

3. It is forbidden to switch gears during the measurement process.

When measuring the current and voltage of the circuit, you cannot switch gears during measurement, otherwise it is easy to damage the multimeter. Especially when measuring high voltage and high current, frequent gear switching will cause arcing and burn the contacts, which is very dangerous. If you want to switch gears, remove the watch pen before switching gears.

Hello dear, glad to solve the problem for you, in the voltage range, the symbol is v. When using the multimeter, insert the red watch pen into the V hole, the black watch pen into the com hole, turn the function switch on the voltage gear V, and start the measurement, look at the reading displayed on the meter, as well as the direction of the voltage, so that the measured data will be more accurate. What to pay attention to when using a multimeter 1, the multimeter should be placed horizontally when used, and check whether the meter hand is stopped at the zero position, if the meter needle has some deviation, you can use a small screw to adjust it, so that the watch needle points to the zero position.

And the test line is also to be inserted into the hole, the pen is plugged into the voltage gear, go to the buzzing position, when the continuous beep sound, it means that the pen is normal, it is best to switch to start the measurement, remember that the multimeter can not be placed around the items with magnetic field, to prevent some errors. 2. When using, the hand should not be in direct contact with the metal of the watch pen, which will not only affect the value, but also cause some risk of electric shock. And when measuring which section of electricity, it is necessary to shift gears while measuring, especially to detect some high voltages, and when there is a large current, or the multimeter will be burned out, you should first disconnect the electric pen, and then go to shift the gear to measure.

3. After use, you should first pull out the watch pen, and at the same time turn the switch to the off gear, if there is no such gear, it is to rotate the switch to the maximum voltage level, such as 1000V. When the multimeter has not been used for a long time, the battery must be removed to prevent battery leakage and corrosion of some devices.