The clamp meter is essentially a combination of a current transformer and an ammeter. It is a meter used to measure the current of an operating electrical circuit and can measure the current without power. So what kind of clamp meter? What are the
clamp meter models ? Let's take a look at it right away.
First, clamp meter work principle Clamp meter (clamp meter), current transformer core can be opened when the wrench is tight; the wire through which the current is measured can be cut through the open gap of the iron core without having to cut off. The core is closed after the wrench is released. The wire of the circuit under test passes through the core and becomes the primary coil of the current transformer, in which a current is induced in the secondary coil through the current. Thus, the current meter connected to the secondary coil has an indication to measure the current of the circuit under test.
Second, the common types of clamp-type meters are divided into two types: mutual inductor type and electromagnetic
type according to their structure and application.
Commonly used is the transformer type clamp ammeter, which consists of current transformers and rectifiers. It can only measure AC current. The deflection of the movable part of the electromagnetic instrument is not related to the polarity of the current. Therefore, it can be used for both AC and DC purposes.
Third, the clamp type model function selection: generally measured current, current divided into two kinds of DC and AC, while also measuring the voltage, resistance and diode test.
Test range: It is mainly the range of test current, generally 200A, 400A, 600A, 1000A, 2000A, the greater is above 3000A, the voltage is generally between 60V-100V.
The diameter of the clamp meter: The size of the clamp meter must be determined according to the conductor size to be measured and the appropriate jaw is selected.
The model of the clamp meter: 2006/20042002PA/2003A/2009A2010F312/F316/F318.
Fourth, the use of clamp meter
(1) Mechanical zero adjustment before measurement (2) Select the appropriate range, first select the largest, then select a small range or see the nameplate value estimate.
(3) When using the minimum range measurement, when the reading is not obvious, you can wind the wire under test several times. The number of turns should be based on the number of turns in the center of the jaw, then the reading = indication value × range / full deviation × 匝The number (4) is measured and the switch is placed at the most range.
(5) When measuring, the wire under test shall be placed in the center of the jaws and close the jaws to reduce errors.
Xiaobian conclusion: Through the introduction of the above content, I believe that everyone has a more comprehensive understanding of the
clamp meter model , if you need to know more relevant knowledge, please continue to pay attention to this site information platform. Follow-up will present more exciting content for everyone.
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