# ammeter Clamp

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## 2-What clamp meter

In electrical and electronic engineering, a current clamp or current probe is an electrical device having two jaws which open to allow clamping around an electrical conductor. This allows properties of the electric current in the conductor to be measured, without having to make physical contact with it, or to disconnect it for insertion through the probe. Current clamps are usually used to read the magnitude of a sinusoidal current (as invariably used in alternating current (AC) power distribution systems), but in conjunction with more advanced instrumentation the phase and waveform are available. Very high alternating currents (1000 A and more) are easily read with an appropriate meter; direct currents, and very low AC currents (milliamperes) are more difficult to measure.

## 4-How it works

the device becomes the equivalent. The use of clamping ammeter installed in equipment, instrumentation, industrial automation and electronics laboratories or workshops as well as electricity and common. Note that the vector sum of currents passing through the nose clamp ammeter shows the current measurement for single-phase, single phase wire placed inside the nose because otherwise the device will show a zero value as the vector sum of phase and null is equal to zero.For measuring low currents, if not show a current clamp ammeter instead of a double clamping arm put round wire and the current measured flow rate divided by the number of turns of wire and conductors to obtain.

## 1-Definition

Ammeter or ammeter or ammeter clamp jaw rake, a tool that allows the measurement of electric current (amps) to ease and without or cut back on the current-carrying conductor.

## 3-Types of current clamp

the mechanism of Types of current clamp action of various types, including: 1.current transformer2-Iron Vane 3. Hall Effect

## 3-1-Current transformer clamp

A common form of current clamp comprises a split ring made of ferrite or soft iron. A wire coil is wound round one or both halves, forming one winding of a current transformer. The conductor around which it is clamped forms the other winding. Like any transformer this type works only with AC or pulse waveforms, with some examples extending into the megahertz range. When measuring current, the subject conductor forms the primary winding and the coil forms the secondary.

## 3-2-Iron vane clamp

In the iron vane type, the magnetic flux in the core directly affects a moving iron vane, allowing both AC and DC to be measured, and gives a true RMS value for non-sinusoidal AC waveforms. Due to its physical size it is generally limited to power transmission frequencies up to around 100 Hz. The vane is usually fixed directly to the display mechanism of an analogue (moving pointer) clamp meter.

## 3-3-Hall effect current clamp

The Hall effect type is more sensitive and is able to measure both DC and AC, in some examples up to the kilohertz (thousands of hertz) range. This type was often used with oscilloscopes, and with high-end computerized digital multimeters, however, they are becoming common place for more general use.

## 5-َApplication current clamp

Ammeter clamp applications: -Application in all industries -Testing high voltage cables -Non-contact flow measurement method -No need to cut the cable -Suitable for wire and cable manufacturers -Suitable for schools, hospitals and installation of metal plating -Switchgear Electrical devices -Contractors and operators of power transmission and distribution company -Section 19 companies that make up the building. -Barshbkh operators and electrical engineers to evaluate and analyze network