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Clamp-type watches and multimeters are test equipment that electronics engineers and electricians often need. Which is better for clamp meters and multimeters? Under what circumstances, how to choose the right instrument?
Clamp meter (sometimes called clamp meter, clamp meter) AC/DC clamp meter is also one of the necessary test tools in daily maintenance work. It is mainly used to test voltage, current, frequency and other related parameters. Higher test resolution, test accuracy and more test functions.
Multimeters, also known as multiplex tables, multimeters, tri-meters, and multi-use meters, are indispensable measuring instruments for power electronics and other departments. Generally, voltage, current and resistance are the main purposes. The multimeter is divided into a pointer multimeter and a digital multimeter according to the display mode. It is a multi-functional, multi-range measuring instrument. The general multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, etc. Some can also measure AC current, capacitance, inductance and semiconductor. Some parameters (such as β) and so on.
Traditional old clamp meters do not have a multimeter in the measurement position. But now the new clamp meter usually has the function of a multimeter, but the accuracy is not too high, mainly three-and-a-half. Therefore, if the accuracy is not very high, buy a clamp meter, and solve any problem. .
The working principle of the clamp ammeter is to use the principle of electromagnetic induction to clamp the wire to be measured into the core of the silicon steel sheet stacked by the clamp ammeter. The wire clamped at this time is equivalent to the coil of the current transformer. It belongs to the primary coil. When a current is passed, the secondary current is induced in the secondary coil inside the clamp-type ammeter, and the measured lead current can be read on the clamp-type ammeter dial.
Clamp-type ammeters and multimeters work differently and are used differently. The clamp meter can measure the current as long as it is clamped by a wire. It is suitable for measuring large current, and the multimeter's current is connected to the circuit to be tested. There is a certain difference in the test operation.
The clamp meter is generally used for card current. The clamp meter does not need to be connected in series in the test current. It is convenient to be stuck on one line of the circuit under test, but the accuracy is not as good as the multimeter string in the circuit. Out of height.
Clamp-type watches are actually rarely used in general. If you want to use a clamp meter to suggest a digital clamp meter, you can use it as a multimeter, or as a clamp meter.
And in normal terms, many schools offer courses that use learning multimeters, and clamp meters are less likely to be in contact.
The convenience of use is also different. The ordinary multimeter can also measure the current, but the table must be connected to the circuit, which belongs to the category of “lossy†detection, and the serial connection process is also troublesome, which is a waste of time; the maintenance master of the ashes level Do two special test leads, but it is only to reduce the complexity of access, or inconvenient.
The clamp meter does not require a test pen when measuring current. As long as the pliers are "bited" on the working circuit, the reading can be immediately displayed, and the convenience is self-evident. Because of its convenience, the clamp meter has become the standard for people who often measure current and power.
Of course, if there is a project involving strong electric power, it is recommended to buy a multi-purpose clamp meter with a multimeter function, which is more convenient to use.
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