How to use the clamp meter? How to use the clamp meter

Clamp ammeters are divided into high voltage and low voltage, and are used to directly measure the current in the line without opening the line. The method of use is as follows: (1) When using a high-voltage clamp ammeter, pay attention to the voltage level of the clamp ammeter, and prohibit measuring the current of the high-voltage circuit with a low-voltage clamp ammeter.

When measuring with a high-pressure clamp meter, it should be operated by two people. Off-duty workers should also fill out a second type of work ticket. When measuring, you should wear insulating gloves and stand on an insulating mat.

They should not touch other equipment to prevent short circuits or grounding.

2) When timing the watch, pay special attention to keeping a safe distance between the head and the live part. The distance between any part of the human body and the charged body should not be less than the full length of the clip-on watch.

3) When measuring on a high-voltage circuit, it is forbidden to connect the clamp ammeter with another meter with a wire. When measuring the phase current of high-voltage cables, the distance between the cable heads should be greater than 300mm, and the insulation should be good. Measurements should only be made if they are deemed convenient.

4) When measuring the current of the low-voltage fuse or the horizontally arranged low-voltage bus, each phase fuse or bus should be protected and isolated with an insulating material before measurement, so as to avoid causing a short circuit between phases.

5) When the cable is grounded, it is strictly forbidden to measure. Prevent grounding breakdown caused by low insulation level of cable head** endanger personal safety.

6) After the clamp ammeter is measured, pull the switch to the maximum range to avoid accidental overcurrent during the next use; It should be kept in a dry room.

Clamp ammeter is a meter commonly used by electricians for daily maintenance, its main function is to measure the current of the phase line, help us troubleshoot the line fault, is a good partner in our daily maintenance.

Select the range first. Before using, we first need to have a general understanding of the rated voltage of the line to be tested, twist the gear switch, and select the appropriate range according to the actual situation (take 20 amps as an example).

Before trying the clamp ammeter, you need to adjust the current gear, you can roughly calculate the current value, determine the gear, determine the measurement position, the measured position must be the exposed wire, the line with the insulation layer can not be measured, move the ammeter, press the wrench to open the jaws, so that the wire passes through the core of the transformer, you can see that the dial pointer is moving, and the value can be read out at the position of the pointer. If it is an electronic screen, the current value of the current line in the working process will be displayed in the electronic screen below the clamp current meter, as shown in the following figure.

First, measure the AC voltage. Turn the clamp meter knob to the AC voltage range. Insert the probe and turn on the table switch. By touching the probes to different points to be measured, the voltage between the two points is displayed.

Second, the alternating current is measured. Measured using a clamp sensing zone. Turn the knob to the AC current setting, turn on the meter switch, and put the single strand energized wire into the clamp center position. The table shows the current of this single strand circuit.

Third, the test circuit is on and off. De-energize the entire circuit, ensuring complete de-energization, including the necessary capacitor discharge. Then insert the probe, turn on the meter switch, and select the gear to the ohmic resistance position.

Use the probe to detect different points, if a short circuit is issued, this alarm indicates that it is unobstructed, otherwise the two points are not connected.

The principle and use of clamp ammeter: Clamp meter is a meter used to measure the current of the electrical line being executed, and can measure the current without interruption. The following is my compilation of how to use the ammeter, welcome to read.

The principle and use of clamp ammeter

A clamp meter is a meter used to measure the magnitude of the current of an electrical line that is being executed, and it can measure the current without interruption.

1.Structure and principle.

The clamp meter is essentially composed of a current transformer, a clamp wrench, and a rectifier magnetoelectric reaction instrument.

2.How to use:

1. Mechanical zeroing should be done before measuring.

2. Select the appropriate range, choose the large range first, then the small range or look at the nameplate value estimate.

3. When the minimum range measurement is used, and its reading is not obvious, the measured wire can be wound around a few turns, and the number of turns should be subject to the number of turns of the jaw**, then the reading = the indicated value of the range full deviation turns.

4. When measuring, the measured wire should be at the first of the jaws, and the jaws should be closed tightly to reduce the error.

5. After the measurement is completed, the transfer switch should be placed at the most ranged place.

3.Precautions.

1. The voltage of the line to be tested should be lower than the rated voltage of the clamp meter.

2. When measuring the current of the high-voltage line, wear insulating gloves, wear insulated shoes, and stand on the insulating mat.

3. The jaws should be closed tightly, and the range cannot be changed with electricity.

Rules for the use of ordinary ammeters

The ammeter should be connected in series in the circuit, otherwise it will be short-circuited.

The current to be from"+"The binding post enters, from"-"The binding post is out otherwise the indicator reverses.;

The measured current should not exceed the range of the ammeter, and the method of test touch can be used to see whether the range is exceeded.

It is absolutely forbidden to connect the ammeter to the two poles of the power supply without passing through the electrical appliance, and the internal resistance of the ammeter is very small, which is equivalent to a wire. If the ammeter is connected to the two poles of the power supply, the index will be crooked, and the ammeter, power supply, and wire will be burned out

Ammeter Reading:

1.See the range.

2.Generally speaking, the scale 0 3a is 0 and 0 is.

3.To see where the watch hand stays, be sure to look at it from the front.

Preparation before use:

1.Adjust the zero button with a flat mouth cone change.

2.Select the measuring range.

A clamp ammeter is a combination of a current transformer and an ammeter. The core of the current transformer can be opened when the wrench is pinched; The wire through which the measured current passes can pass through the gap where the core is open without being cut, and the core closes when the wrench is released.

1. First of all, correctly select the voltage level of the clamp ammeter, check whether its appearance insulation is good, whether there is damage, whether the pointer swings flexibly, and whether the jaws are corroded. The rated current is estimated based on the power of the motor to select the range of the meter.

2. Before using the clamp ammeter, you should read the manual carefully to find out whether it is an AC or AC or DC clamp meter.

3. Due to the low accuracy of the clamp ammeter itself, the following methods can be used when measuring small currents: first wrap the wire of the tested circuit around a few times, and then put it into the jaws of the clamp meter for measurement. In this case, the current value indicated by the clamp meter is not the actual value being measured, and the actual current should be the reading of the clamp meter divided by the number of turns of the wire winding.

4. The jaws of the clamp meter should be closed tightly during measurement, if there is noise after closing, the jaws can be opened and re-completed once, if the noise can not be eliminated, the joint surface on the magnetic circuit should be checked whether it is smooth and clean, and it should be wiped clean when there is dust.

Clamp ammeter.

5. The clamp meter can only measure the current of one phase wire at a time, and the measured wire should be placed in the clamp window**, and the multi-phase wire cannot be clamped into the window for measurement.

6. The voltage of the tested circuit should not exceed the value indicated on the clamp meter, otherwise it is easy to cause grounding accidents or cause electric shock hazards.

7. Measure the working current of the cage asynchronous motor in operation. According to the size of the current, you can check and judge whether the motor is working normally, so as to ensure the safe operation of the motor and prolong the service life.

8. When measuring, you can measure once per phase, or once in three phases, at this time the number on the table should be zero, (because the three-phase current phasor sum is zero), when there are two phase wires in the jaws, the current value of the third phase is displayed on the table, and whether the motor has an overload phenomenon by measuring the current of each phase (the measured current exceeds the rated current value), whether there is a problem with the power supply voltage inside the motor or (the device that can convert other forms into electrical energy is called the power supply), that is, whether the three-phase current imbalance exceeds the limit of 10%.

How to use a clamp ammeter.

9. Before measuring the clamp meter, the size of the measured current should be estimated first, and then decide which range to use. If it is not possible to estimate, you can use the maximum range first and then change it to a smaller one to get an accurate reading. It is not possible to use a small current to measure a large current. In case of damage to the meter.

The method of using the clamp punch ammeter is as follows:

Tools Raw materials: one clamp table, two table pens.

1. Insert the COM interface, first pick up the pen of your waxing juggernaut clamp table, and insert the black pen into the COM interface.

2. Insert the voltage interface, and then insert the red meter pen into the voltage interface on the right.

3. Rotate the button in the middle of the clamp table to the mode you want to test.

4. Contact the voltage interface, pick up your red and black two gauge pens, and use these two gauge pens to contact the interface you want to measure voltage.

5. Observe the data, after touching the interface, directly observe the data on the clamp table screen, so that you can know the interface data you measured.

6. Contact coil, if you want to measure the quality of the capacitance, use two meter pens to directly contact the two coils of the capacitor.

7. Observe the data, and observe the data on the clamp table after contact.

8. If you want to measure the current of the coil, rotate the button in the middle of the clamp meter to the digital position of the current.

9. Press and hold the button, press and hold the button on the left side of the clamp table, and turn on the pliers above the clamp watch.

10. Circle the coil.

Use this plier to circle the coil you want to measure, so that the current data of the coil will appear on the clamp meter screen.