How to take a multimeter to measure the grounding of the line?

You can adjust the multimeter to 600V AC voltage level, then put the multimeter on the water pipe, and use the red watch pen to measure the neutral line, ground wire and live wire.

The grounding of the measurement line is generally used in the "ohm" of the multimeter, and the measurement process is as follows: first disconnect the main power supply, screw the gear switch to the ohmic file, and then turn the metal part of the two pen nibs.

Observe the number displayed on the electronic screen of the multimeter at this moment, if it tends to 0 ohms, or the measured indicator is less than 5 ohms, it can be concluded that the line is grounded (short circuit to ground).

If the measured resistance value is large, more than 100 ohms, the line is not grounded.

The multimeter is moved to the maximum gear of the ohm file, and then the red pen and the black pen are connected to both ends of the measured line, if the line is on, your resistance value must be very small, if the line is broken, then the measured resistance is very large, the resistance value is hundreds of kiloohms or even megaohms. It is also possible to set the gear to the position marked with the diode, if the circuit is on, the multimeter will beep, otherwise it is disconnected.

The test point to ensure that the pen contacts is in good contact.

Choose the largest megaohm, conditionally choose a large analog meter, which has high relative sensitivity and a large current in the ohm range.

Disconnect the power supply, disconnect the main switch, and tag a warning to prevent closing.

Disconnect each path from the empty open, and then measure the circuit with the lowest resistance.

When the insulation resistance is restored to normal or other circuit states, the fault is that circuit (equipment).

Basic knowledge of electrician: How to use a multimeter to measure whether the grounding is effective, so that the judgment is simple.

How to measure the grounding pro with a multimeter, hello, use a multimeter to measure the on-off file, the on-off file is a measurement mode that almost all multimeters have, which is used to measure the conduction (short circuit) of the line. Generally, it will be matched with a buzzer and LED light, and the buzzer will sound or the LED light will be on, indicating that the line is on. 1. When measuring, the needle of the black pen is in contact with the wall or the ground.

2. Use the watch hand of the red pen to contact the wire core of the circuit to be measured, and observe the measurement results, 3. If the insulation resistance of the measured value is greater than or equal to the megaohm, it is in line with the previous calendar, that is, there is no leakage; If the measured insulation resistance is less than a megaohm, it is unqualified, that is, leakage. 4. If the buzzer sounds, it is grounded. As long as there is a short circuit, the gear will sound, and the watch pen will sound when it touches each other.

When the extended data multimeter is dialed to the on/off gear, the internal circuit that is turned on is: the black watch pen is connected to the negative pole of the internal battery, the positive pole of the battery is connected to the resistance value of the resistor, and the other end of the resistance is connected to the red watch pen. The internal tweeting circuit takes the trigger signal from the resistor.

If the two gauges are short-circuited or the resistance between them is smaller, then the voltage on the trigger resistor in the meter is higher, which triggers a chirp. If the resistance between the two stylus is large, then the voltage division of the internal trigger resistor in series is so small that the chirp cannot be triggered. I hope my answer is helpful to you, and finally I wish you good health and a happy mood again!

Summary. Hello, glad to answer for you. Kiss, multimeter measurement grounding method; 1.

The grounding of the measurement line is generally the "ohm file" of the multimeter, and the measurement process is as follows: 1. First disconnect the total power supply, screw the gear switch to the ohm file, and then touch the metal part of the two pen nibs at one end and ground the other end (GND).

Hello, Zheng is happy to answer for you. Kiss, multimeter measurement grounding method; 1.The "ohm" of the multimeter is generally used for the grounding of the measurement line, and the measurement process is as follows:

1. First of all, disconnect the main power supply, screw the gear switch to the ohmic gear, and then touch the metal part of the two pen heads at one end to the line of the waiting hall and the other end to the ground (GND).

2. Observe the indication displayed on the electronic screen of the multimeter at this moment, if it tends to 0 ohms, or the measured indicator is below 5 ohms, it can be concluded that the line is grounded (short road to the ground). 3. If the measured resistance value of the attitude crack is large, more than 100 ohms, the line is not grounded.

First understand the concept of leakage:

Leakage is due to the insulation resistance of wires and electrical equipment.

If the value is too low, the insulation resistance is less than the required resistance value, which will cause the resistance value of the wire or equipment to the ground or the line to be too small, so that the wire to the ground or the wire to the equipment has a current to pass.

A multimeter can be used.

Let's simply measure whether the circuit leakage, but the result of the multimeter is not very accurate, you must know this.

Measurement method: disconnect the power supply of the circuit, turn on the multimeter, we insert the black pen of the multimeter in the com hole, insert the red pen in the V hole, and then adjust the gear of the multimeter to the resistance level, it is best to use the 2m gear; When measuring, we use the black pen to contact the wall or the ground, and the red pen to contact the wire core of the circuit to be measured, we observe the measurement results, if the insulation resistance of the measured value is greater than or equal to the megaohm is qualified, that is, no leakage; If the measured insulation resistance is less than a megaohm, it is unqualified, that is, leakage.

According to the inscription, in the state of electrical equipment energized, if the grounding insulation is not good, then it is possible to make the grounding wire live, you can first simply use the high resistance of the multimeter (m), measure the insulation resistance of the neutral line and the grounding wire, according to the International Electrotechnical Commission standard, if it is less than 2m, it should be judged that the insulation to the ground is poor, the ground wire may be electrified, and the cause must be carefully identified and troubleshooting. Thank you!

With the AC voltage of the multimeter 250 volts, any meter pen is grounded, and the other meter pen receives the measurement point, and the grounding voltage value can be read.

There are three ways to measure whether the ground wire is in good contact:

1. Bulb measurement, the bulb should be treated in advance, and two wires should be connected for later operation - if there is an idle lamp port, the bulb can be directly installed on the lamp port, and then the bulb will be connected to the neutral wire and the live wire, between the ground wire and the live wire (remember to power off when wiring), observe the brightness of the bulb, and analyze the results.

With the ground wire well grounded, the brightness of the bulb is the same twice. If the ground body fails, the bulb does not light up. If it's just that the ground resistance is slightly larger, then the bulb is only slightly dimmed.

2. Grounding resistance tester, generally speaking, this equipment will be used for testing during project acceptance. The ground resistance tester can accurately measure the ground resistance of the ground wire. Generally, the ground wire used in our family, as long as the grounding resistance is not greater than 4 ohms, it is qualified.

3. Multimeter measurement, multimeter is also known as multiplex meter, multi-meter, three-purpose meter, multi-meter, multi-meter, etc., which is an indispensable measuring instrument for power electronics and other departments, generally with the main purpose of measuring voltage, current and resistance.

How to use: When measuring, turn the gear knob to select the correct gear (250V). After that, insert the black pen into the COM jack and the red pen into the jack marked "V".

Holding a watch in one hand, and two watch pens in the other like chopsticks – only a plastic rod, no wires, and no metal at the front. Touch the two watch pens to the two lines to be measured.

Judging method: The voltage between the zero live wire is the same or slightly larger than the voltage between the ground wire and the live wire (no more than 5V), which proves that the ground wire is well grounded, and the smaller the gap between the two, the smaller the ground resistance. Otherwise, the grounding body fails.