How to measure the zero line with a universal meter only the zero line .

The method is as follows: 1. Take out the digital multimeter, and the knob of the multimeter reaches the AC 750V level.

2. The black pen of the multimeter touches the nearest wall or earth or holds the black pen in the left hand, wraps the line of the pen around the hand a few times, and the red pen touches the line that needs to be measured, and measures one by one.

3. Observe the digital display of the multimeter, the displayed number is relatively large, indicating that the line is the live line, and the relatively small line is the zero line.

1. The range of the multimeter is switched to the AC voltage gear, so the multimeter should have such a function, 2. The range is from 200MV 750V, and the 200V file is generally selected, and some clamp meters do not have 200V gear, and the range can be selected a little larger, and the pointer multimeter gear should be smaller, and 10 V 100V can be selected 3. Then use the red and black pen to insert them in V Com (the jack that usually measures the 220V voltage of household appliances).

4. Wrap the black watch pen wire around the left hand 2-3 times (see the picture), of course, the more the better, pay attention: at this time, the black watch pen metal needle must not touch the hand, in case of electric shock.

5. Take the red pen in your right hand to measure the zero line or the live line respectively, and you write down the results of 2 measurements, the big one is the live line, and the small one is the zero line.

In the three-phase four-wire system, the neutral wire grounding is the neutral line, and the effective voltage between the phase wire is 220V AC, when measured with a multimeter, when you judge the live wire is the phase wire, you can use a multimeter to measure the AC voltage between the phase wire and the neutral line, if there is a voltage of 220V, that is, it is judged to be the zero line, if in the grounding system, the ground wire is also close to 220V, so that the problem can not be judged, the general multimeter can not be directly measured, the simple judgment method is ** Connect a leakage protection circuit breaker at the entrance of the road, connect an ordinary socket in the place where you need to judge the line, connect a phase zero (ground) wire at will, and then connect a load, such as a bulb lamp or something, if the leakage protection circuit breaker trips, that is, you are connected to the ground wire, such as the normal zero line. Hope the answer is useful to you.

Use a multimeter to measure the voltage of two wires to the ground, and the voltage of 0 is the zero line.

Summary. Hello dear, glad to answer for you! The method of measuring the live zero line with a multimeter is as follows:

First of all, the multimeter should be adjusted to the AC voltage level, adjusted to 200V, and then use the multimeter pen to measure one of the wires. The other wire of the multimeter, after finding a metal pipe to connect, if the needle on the meter is rotated or there is a number, then this line is a live wire. If there is no rotation, then the line is a zero line.

How to measure the zero line with a multimeter.

Hello dear, glad to answer for you! The method of measuring the zero line live with a multimeter is as follows: first adjust the multimeter to the AC voltage level, adjust it to 200V, and then use the meter pen of the multimeter to measure one of the wires.

The other wire of the multimeter, after finding a metal pipe to connect, if the needle on the meter is rotated or there is a number, then this line is a live wire. If there is no rotation, then the line is a zero line.

How to measure capacitance: Before using a multimeter to measure capacitance, you must first adjust the range of the multimeter to the most appropriate position, and reset its value to zero. Next, place the pen of the multimeter on both sides of the capacitor to be tested, and then discharge the capacitor.

Then adjust the function of the switch to make it in the F gear. Then adjust the range as well, and then put the capacitor into the capacitor test space, so that you can see its value on the multimeter.

There are two ways to use a multimeter to measure the live neutral line:1Set the multimeter to voltage mode, connect the electrode probe to both ends of the target wire, if there is a voltage display, it means that the wire is live; 2.

Set the multimeter to current mode, connect the red electrode probe to one end of the target wire, and connect the black electrode probe to the ground wire at either end, if there is a current display, the wire is live.

How to measure the zero line with a multimeter.

There are two ways to use a multimeter to measure the live neutral line:1Set the multimeter to voltage mode, connect the electrode probe to both ends of the target wire, if there is a voltage display, it means that the wire is live; 2.

Set the multimeter to current mode, connect the red electrode probe to one end of the target wire, and connect the black electrode probe to the ground wire at either end, if there is a current display, the wire is live.

The following points need to be strictly noted: 1. Keep your feet off the ground. Step on a stool or wear insulated rubber shoes.

2. Avoid touching the zero line of fire with both hands at the same time. The hands are electrocuted, forming a circuit of live wire, right hand, left hand, and neutral wire. 3. Insulation equipment.

Bring insulated gloves and insulated rubber shoes. Also, use a professional electrician's tool with an insulated handle. 4. Hire a professional electrician.

If the circuit is too complicated, or you are not familiar with the circuit, it is safer to hire a professional electrician.

Dear, be sure to pay attention to safety! Safety comes first<>

Summary. Turn the multimeter to AC AC, wrap the black pen around your left hand about twice, and the red pen will make contact with either the live wire or the neutral wire. Then observe the value, if the measured value is within 5 volts, you can judge that it is the zero line, because generally speaking, the zero line has no voltage.

And if the measured value has exceeded 10 volts, it can be judged that the wire is a live wire.

Hold on. Turn the multimeter to AC AC, wrap the black pen around your left hand about twice, and the red pen will make contact with either the live wire or the neutral wire. Then observe the value, if the measured value is within 5 volts, you can judge that it is the zero line, because generally speaking, the zero line has no voltage.

And if the measured value has exceeded 10 volts, it can be judged that the wire is a live wire.

1. The essence of "zero line live" is the result of the open circuit or poor contact of the zero line and the connection (directly or indirectly) with the live wire. Generally, the AC voltage of the multimeter (greater than 220 volts) is used to measure the voltage of the line to the ground, and the size of the measured voltage value can be observed to know whether it is charged and how strong the charge is. If the voltage value exceeds the safe voltage of 36 volts, it should be paid attention to, and it cannot be considered as a neutral line.

2. The neutral line becomes a live wire due to an open circuit, and many times the switch is incorrectly installed on the neutral line, and the wire under the switch passes through the electrical appliance (such as a lamp) and the live wire has the same potential after the switch is disconnected. Therefore, the switch must be installed in the line of fire.

3. When the disconnected neutral wire is not connected to the live wire (directly or indirectly), sometimes it can also bring "induced electricity", which is caused by the "inter-line capacitance" between the neutral wire and the live wire. In particular, when measuring with a digital multimeter (the internal resistance of the voltage range is very high), it is easy to cause misjudgment.

Hello:To measure the current with a universal meter, the line needs to be disconnected.