[Hyuki's clamp ammeter 3282](https://www.automation24.ir/product-799/%DA%A9%D9%84%D9%85%D9%BE-%D8%A2%D9%85% 25D9%BE%D8%B1-%D9%85%D8%AA%D8%B1-%D9%87%DB%8C%D9%88%DA%A9%DB%8C-3282)
### clamp meter:
Clamp meter is a very widely used tool for engineers and technicians who are related to the electrical industry. It is very easy to use this tool and only to measure the current of the circuit, it is necessary to place the clamp part of the device around the current carrying wire and measure the amount of current without the need to connect the device in series with the circuit.
Note: clamp meters can also be used as a multimeter. Also, this equipment can be made in different sizes. When buying a multimeter, you should choose an ammeter depending on the cross-section of the current-carrying conductor and the amount of current passing through the circuit.
### General definition of ammeter:
As we know, if the net charge dq passes through a surface in the time interval dt, we say that current i is established in the circuit, or in other words, if one coulomb of charge passes through the cross-section of a conducting body in one second, the current of one ampere is It has passed. Now, since we are not able to count the number of free electrons in a conductor, we need a device that can show it to us in the form of current intensity, so that we can use it to analyze the circuit. A device that can measure this process by the amount of current passing through the surface of the conductor is called an ammeter.
Note: In clamp meters, we use the clamping part of the equipment to measure the passing current and measure the current value of the circuit. Also, there are other equipments that are in the form of a fork (mand clamp meter) that have applications such as measuring the leakage current of the circuit.
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## The method of measuring circuit leakage current:
In general, there are 2 ways to measure the leakage current. One way to measure the leakage current is to directly throw the clamp meter around the ground connection wire and measure the leakage current. In the second method, we can use the clamp meter. Throw a current around the two wires and if there is a leakage current in the circuit, measure it in this way.
Scientifically, measuring the leakage current by hooking the clamp meter around the pair of current-carrying wires results from the average difference between the forward and reverse currents. In fact, the difference between the return and return current inside the clamp meter display indicates the leakage current in the consumer.
If there is no leakage current in the consumer, the clamp meter display will show zero. If there is a leakage current in the consumer, the leakage current returns to the power source through the earth.
The result of the current difference between the two wires, which is shown on the display, is the amount of leakage current.
Note: clamp meters basically measure the value of circuit current in two ways: True Rms and average
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