How to use a digital multimeter to measure whether the line is energized?

Turn the digital multimeter to the current gear, take the red and black stylus to the two sides of the contact switch under the float, there is a current display to prove that it is energized, and there is no current display to the line is faulty.

How to use a digital universal meter to measure whether the line is energized is as follows:

Measure whether the line is unblocked: hit the resistance gear or diode.

The beep level is measured at both ends of the suspect wire, if the value is close to 0 ohms or buzzer.

sound, indicating that the line is unblocked; If the value shows 1 or the buzzer does not sound, it means that the line is not smooth and there is an open circuit.

Definition of energization: Under normal conditions, the resistance between phases or between phases and ground is very large, and when there is a short circuit, the resistance is basically zero, with a multimeter.

Measuring resistance is completely fine. This kind of measurement is difficult to measure in the conductive state, but it is easy to measure and judge when the circuit is not turned on.

You need to remove the control board inside, and then put the float in the position that needs to be removed, and measure whether the two pieces of the float are on.

Use the method of elimination. Whether the switch is broken. Whether the float cannot touch the switch. Just use the multimeter current to block the current.

How to use the multimeter.

1. Method 1: Turn on the multimeter, hit the gear to the resistance level, and check the resistance value at both ends of the test wire;

2. The resistance value is small, indicating that the wire is on and can be energized.

3. If it is too large, you should refer to the material and length of your wire.

4. If it is infinite, the multimeter has no numerical value display, indicating that the wire has an open circuit and is not conductive.

If the wire is not electric, hit the multimeter to the "on-off gear", and the two meter pens touch the two ends of the same wire respectively, making a "Dididi" sound, indicating that the wire is on;

If there is electricity, turn the multimeter to the "voltage level" and measure the voltage directly.

We can use the AC voltage level of the digital multimeter to test. Here's how:

The 20,000-gauge gear is rotated to the highest AC gear: 750V gear.

Insert the multimeter red pen into the V hole and the black watch pen into the COM hole.

Wrap the black pen wire around your finger 3 or more times and suspend the pen probe in the air.

Use the red pen to touch the test point in the line to be measured.

If the multimeter has a reading, it means that there is electricity in this line, and if there is no reading, it means that there is no electricity in the line.

Note: Do not touch metal parts such as wires or screws in the line, as well as the metal part of the probe of the multimeter during the test to prevent electric shock.

Some multimeters have a gear similar to a voltage tester, the symbol is a triangle, hold a watch pen in your hand, and the other watch pen touches the wire, and the fire wire will light up or show a triangle on the display.

Use the multimeter AC 500 volt voltage level to measure, and the AC voltage gear sign is similar. Pay attention to safe use.

Using a multimeter voltage level measurement is fine.

1. First of all, you need to connect the two meter pens of the multi-purpose pen to the voltage and ground wire, divided into red line and black wire, the red wire is the positive pole of the power supply, and the black wire is the negative pole of the power supply.

<>3. If the line is 220V, the black line is selected, if the AC current is measured, the gear is adjusted to the AC current area, and the DC current and AC current correspond to two different gears.

<>5. Insert the red and black watch pen into the difference, and the multimeter reads out the value. If there is a digital display of the current number of the normal line, it proves that the line is good.

1. The multimeter is a sharp tool for electronic measurement, which can be used to measure the on-off of the line in daily life. The resistance level is used to measure the on/off and is the simplest function. First of all, let's understand the structure of a multimeter through a diagram.

2. Take a dental probe as an example to illustrate to determine whether point A and point B are on, first ensure that the wiring is correct, the black wire is inserted into the COM socket, the red wire is inserted into V, and placed at the 200 place of the resistance file, or the gear of "buzzer, diode". The red pen or black pen is connected to the two ends of A and B respectively. If A and B are disconnected, the LCD screen will display "1", indicating that the resistance is infinite.

3. Use the same method to measure points A and C to determine whether they are connected. When using the resistance setting, a runout number of less than 200 is displayed if the wire is on.

4. When actually measuring, you can connect the red and black watch pens to the common end and the left and right channel ends respectively, and pay attention not to touch the line between the red and black watch pens. Properly connect the red and black pencils. The red and black pen connects both ends of the line to be measured.

If the pointer resistance is close to zero, or is relatively small, the line is connected. If it does not move, or if the resistance is large, the wire is disconnected.

1. Insert the black watch pen and the red watch pen in the corresponding interface position, here the black watch pen is plugged in the com interface, that is, the public interface, the red watch pen is plugged in the V interface, and the voltage measurement voltage is the general insertion method of the multimeter.

2. Then adjust the range of the scale knob, which points to the scale with the note identification, or the position with the sound identification, that is, the universal guess or the beep file of the watch.

3. Next, press the on/off button to enable the multimeter, here you can see the number 1 displayed on the display, that is, the state value of Sui Huiwu is not turned on, and 1 represents the resistance value infinity.

4. Next, prepare a wire (here the wire replaces the circuit, the measurement method is the same), touch the two ends of the wire with a black watch pen and a red watch pen respectively, and then you can see that there is a numerical change on the display screen (as long as it is not 1), and there will be a beep at the same time, which means that the wire can be connected and form a path.

1. Use the diode (buzzer) gear to measure the circuit on/off: first cut off the power supply, and the red and black multimeter pens are connected to the beginning and end of the line to be measured respectively, and the alarm will sound is the path, otherwise the circuit will be broken somewhere in the middle of the line.

2. First of all, make sure that there is no electricity in the circuit under test, and then put the multimeter in the ohm file, and first short the two meter pens of the multimeter to see if it is zero.

3. If the line is high (resistance less than 30), the multimeter will beep, and the specific resistance will be displayed on the display screen. If the specific value is displayed on the screen of the buried fruit multimeter, but no beep sound, it proves that there is a virtual contact in the line.

4. Use ohm x1 gear, measure the two ends of the line, if the resistance value is close to zero, it is a short circuit, if there is a certain amount of resistance value (depending on the load in the line), it is not a short circuit, when the liquid gauge is at a certain voltage, the smaller the resistance value, the greater the current flowing through the line.

5. How to measure the on-off of the wire with a multimeter is as follows: measure the resistance of the wire through the multimeter, first adjust the multimeter to the buzzing gear, and then correspond to the two ends of the red pen and the black pen to the wire to be tested.

In the process of using electricity, the line may often have some poor contact, so it is necessary to find out what is the best contact, and the poor contact can be repaired in a reasonable way. So how does the multimeter detect the line? Today, I will introduce to you the specific use method.

1. How to measure whether the line is open with a multimeter.

1. Turn on the start button of the multimeter first, and restore the value on the multimeter to the original state.

2. Connect the red pen and black pen on the multimeter with both ends of the line, if you can hear the beep, then it will represent that the line is passable, if you can't hear the buzzer, it means that the line is not passable.

Second, what are the classifications of multimeters.

Now the most advanced multimeter classification on the market can be basically divided into two categories, one is a multimeter that reads data through a pointer, and the other is a multimeter that reads data through numbers, the decibel of these two multimeters is about the same, basically can reach about 80 120.

Third, the use of multimeter is to pay attention to what problems.

1. Before testing the line, be sure to zero the display on the multimeter.

2. When using the multimeter, the hand can not directly touch the black pen and the red pen of the multimeter, and the electric shock will occur without trembling, and it will also lead to inaccurate measurement data.

3. When using the multimeter to detect the line, be sure to put the multimeter horizontally on the ground or on the object, and at the same time avoid a very strong magnetic field near the multimeter.

4. After the multimeter is used, the switch should be turned off, and the battery inside should be taken out at the same time to prevent the battery from corroding the parts inside.

Fourth, the multimeter detects whether the line is accurate.

As long as it is in accordance with the rules of use of the multimeter to detect the line, then the results of the detection are very accurate, if you are not worried about the results of your own air detection, you can let professionals use other types of lines to detect the hole land detection instrument.

After using a multimeter to detect the line, you must remember to deal with the relevant problems in time, if you continue to use electricity, there will be a lot of accidents.