How a clamp meter measures current and how to measure overload current

Clamp meter measures current and how to measure overload current:

1 Move the clamp meter to the highest position of the AC current gear (the maximum current of the clamp meter must be higher than a multiple of the load current).

2. Measure the current of each phase separately, the current is its load current within the rated value range, and the current exceeding the rated value is its overload current.

Clamp Table Definition:

Clamp meter (sometimes called clamp meter, clamp meter) AC and DC clamp meter is also one of the necessary test tools in daily maintenance work, mainly used to test voltage, current, frequency and other related parameters, requiring it to have high test resolution, test accuracy and more test functions.

How the clamp meter works:

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. The conductor of the circuit under test passing through the core becomes the primary coil of the current transformer, in which the passing current induces a current in the secondary coil.

Thus, the ammeter connected to the secondary coil has an indication of the current of the line under test. The clamp meter can be changed to different ranges by switching the switch gear. However, live operation is not allowed when dialing.

Clamp meters are generally not very accurate, usually at the level. For ease of use, there are also transfer switches of different ranges for measuring different levels of current and voltage.

Clamp ammeter is very simple to measure current, just snap the wire into the clamp ring.

The measured current is no different from the overload current, but it depends on the range.

Adjust the current gear, just take a small pliers and a card.

It's been said in such detail upstairs, so what else can I say?

1. Select the gear and range. Turn the meter switch to DC current"ma"In terms of position, the measuring range is correctly selected according to the size of the current to be measured. In the case of not knowing the size of the current, in order to avoid the current exceeding the range of the range, it can be placed in the highest gear of DC current for test first.

If the range is too large, reduce the range until the range is suitable.

2. Serial circuit. When measuring the current of the multimeter, the current must be connected in series, and the red pen must be connected to the high-potential end of the circuit, and the black pen must be connected to the low-potential end of the current.

3. How to read:

1) Choose the tick mark correctly for reading.

2) Convert current value: current value = number of scales referred to by the pointer Size of the range The maximum value of the selected scale.

2. The following points should be paid attention to when using clamp ammeter:

1. When measuring on the high-voltage circuit, it is forbidden to use a wire to connect the meter from the clamp ammeter to the meter. When measuring the current of each phase of the high-voltage cable, the distance between the cable heads and wires should be more than 300mm, and the insulation should be good, and it can only be carried out when the measurement is considered convenient. 2. Special attention should be paid to maintaining a safe distance between the head and the charged part, and the distance between any part of the human body and the charged body shall not be less than the entire length of the clamp meter.

3. When measuring the current of low-voltage fusible fuse or horizontally arranged low-voltage busbar, each phase fusible fuse or bus should be protected and isolated with insulating material before measurement to avoid interphase short circuit.

4. When using a high-voltage clamp ammeter, attention should be paid to the voltage level of the clamp ammeter, and it is strictly forbidden to measure the current of the high-voltage circuit with a low-voltage clamp meter. When measuring with a high-voltage clamp meter, it should be operated by two people, and the second type of work ticket should also be filled in by non-duty personnel for measurement, and insulating gloves should be worn during measurement, standing on the insulating pad, and other equipment should not be touched to prevent short circuit or grounding.

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

6. When the cable has a phase grounding, it is strictly forbidden to measure. Prevent the occurrence of ground breakdown** due to the low insulation level of the cable head and endanger personal safety.

7. When the clamp meter is measured, the current of the wire close to it also has an impact on it, so it should also be noted that the position of the three-phase wire should be equal.

8. Do not operate with electricity during maintenance to prevent electric shock.

The first step is to adjust to the right range! Then take a measurement of the wire to be measured! Then measure out how much is how much! For example, if the 200A range is measured to be 132, then the current is 132A.

You need to select the appropriate range and then measure the one-phase current cable, which is the current of the object being measured.

1. Select the appropriate current range, select the maximum range if it cannot be estimated, open the bayonet of the clamp meter and snap the telemetry cable core into it to ensure that the bayonet is in good contact, and the reading can be done. If the reading is not good due to the position, you can press the hold button, and then remove the clamp table to read again.

The current measurement of the clamp meter is generally measured by the meter pen and the pliers above, and the specific operation steps are as follows:

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

1. Insert the COM interface.

Pick up the pen of your clamp watch first, and insert the black watch pen into the COM port.

2. Insert the high-voltage interface of the electric section beam.

Then insert the red gauge pen into the voltage connector on the right.

3. Rotate the middle button.

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

4. Contact voltage interface.

Pick up your red and black pens and use them to touch the connector where you want to measure the voltage.

5. Observe the data.

After touching the interface, directly observe the data on the clamp meter 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 stylus to contact the two coils of the capacitor.

7. Just observe the data.

After contact, you can also hold the ruler and observe the data on the clamp table.

8. Rotate the button for a long time.

If you want to measure the current in the coil, turn the button in the middle of the clamp meter to the numeric position of the current.

9. Press and hold the button.

Press and hold the button on the left side of the clamp watch to open 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.

When measuring current, we often use a clamp ammeter, which is named because it is shaped like a pliers. So, let's introduce how to measure the current of the clamp ammeter, and let's find out if you need it!

1. How to measure the current of the clamp ammeter.

1. Select the appropriate gear of the clamp table, and use the AC current gear; 2. Then connect the jaws of the clamp meter with the circuit to be tested before the bureau; 3. Correctly connect the circuit under test, then the actual current can be detected, if you want to measure the starting current, you need to press the "inrush" button on the basis of the previous step of opening the home appliance.

2. What should be paid attention to when using a clamp ammeter.

1. Before use, you should check whether the appearance of the clamp meter is well insulated, whether there is damage, whether the pointer swing is sensitive, and whether the jaws will have rust problems. The current is limited according to the motor power estimation to determine the clamp meter range.

2. The voltage of the measured wire should not exceed the value marked by the lead wax clamp table, otherwise it is easy to cause grounding accidents or potential safety hazards.

3. Because the accuracy of the clamp meter itself is not high, when testing the small current, the wires of the circuit under test can be wound first, and then put into the jaws of the ammeter for testing. This is the current value measured by the clamp meter and not the actual current, which is the reading of the clamp meter divided by the number of turns around the wire.

4. When using the clamp ammeter, the jaws should be closed closely, if there is noise after closing, the jaws can be opened and tried again, if the noise is still not eliminated, you should see whether each joint surface on the magnetic circuit is clean, and the dust should be cleaned up.

5. The clamp meter can only test the current of one phase wire at a time, and the tested wire should be placed in the middle of the clamp window, and the multi-phase wire cannot be clamped into the window for testing.

Hello, glad you with this question. First, open the jaws of the clamp meter, and then correctly connect the clamp meter to the circuit under test, and then the actual current of household appliances can be measured. Only a single power cord of the circuit under test can pass through the jaws, and two electric rock wires can be tested separately in two times, and the measured values of the two times should be equal in theory, otherwise the line clearance and guessing the road is abnormal, and the leakage current is large.

Clamp ammeter: An ammeter that combines a current transformer and an ammeter.

It can measure high-power currents flowing through a single wire.

Generally, it can only measure AC current, but there are also DC and AC dual-use!

You look at the manual, most clamp ammeters can measure alternating current, some can measure direct current, and some professional meters can be used for both alternating and straight.