Electrical Connectors

!±8± Electrical Connectors

An electrical connector is a gadget used for joining two or more electrical circuits together. These connectors are generally used to form temporary connections, although some may form permanent ones. Electrical connectors are an integral part of most contemporary day devices.

There are any dissimilar types of electric connectors such as plug and socket connectors, final blocks, component and gadget connectors and crimp-on final connectors. Plug and socket connectors have a male plug and female socket. Male connectors plug into receptacles, jacks, and outlets. Female connectors include sockets to receive other devices. Gender changers turn female connectors to male connectors, and vice versa. Some examples are audio and video connectors, computer connectors and power connectors.

Terminal blocks provide a means of connecting personel electrical wires. They are also called final boards or strips. They are one of the most flexible types of electrical connectors available but they have some disadvantages. Firstly, it is difficult to join together wires than plugging a cable. Secondly, terminals are generally not very well protected from contact with citizen or foreign conducting materials.

Apart from personel screw terminals, fast-on or quick-disconnect terminals are also generally used as component and gadget connectors. Crimp-on terminals are also called lugs. They are attached to wires to be connected with screw terminals. Crimp-on terminals are used for connecting two wires together permanently.

Computers also employ any types of electrical connectors. These connectors are used to fit ribbon cables, coaxial cables, batteries and power supplies.

Electrical connectors come in any dissimilar sizes. These vary, from the acceptable 16 contact connectors, to the 24 contact micro-miniature connectors. Water resistant electrical connectors are also available, convenient for areas with a high level of humidity. Prices of the connectors may vary, depending upon the function and durability. With technology developing at a rapid rate, newer and great electrical connectors are sure to bring about an evolution in the use of electric appliances.

Electrical Connectors

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IGBT Test Procedures

!±8± IGBT Test Procedures

The term IGBT is an acronym for Insulated Gate Bipolar Transistor. It can be thought of as a Transistor with a MOSFET front end. It has three terminals (or leads) labeled Gate, Collector and Emitter. Some IGBT's have a built in protection diode. This diode is connected across the Collector and Emitter terminals. It is added for transient voltage protection when the IGBT is switching Inductive loads.

When these devices are considered 'suspect' it is necessary to validate their operation through a functional test procedure. One of two methods can be used:

The first test method will validate the condition of the protection diode, and the resistance of the Collector and Emitter terminals. It is not a definitive test, but will find 80% of all faulty devices. This is due to the fact that most faulty IGBT's show a low resistance or short across the Collector and Emitter terminals when the device is stressed.

To perform this test will require a DVM (Digital-Volt-Meter). Set the DVM to the Diode Test position, and confirm that the device tests as follows:

Attach the Red Lead of the DVM to the Collector Terminal and Black Lead to the Emitter Terminal. Confirm an open circuit condition.

Attach the Red Lead of the DVM to the Emitter Terminal and Black Lead to the Collector Terminal. Confirm an open circuit condition (IGBT without a protection diode). If the DVM displays a forward voltage drop of 0.2 to 0.8 VDC it means that the IGBT has a built in protection diode. Both of these results are normal test conditions and are used to confirm whether the IGBT has a protection diode, and if it does, whether it is functional or not.

The second test method will check the IGBT's functionality, by gating the device. To perform this test will require an IGBT Tester. Confirm that the device tests as follows:

Attach the IGBT Tester leads to the Gate, Collector and Emitter Terminals. Confirm that the device Conduction LED is not lit.

Press the Test Button, and confirm that the Conduction LED lights.

Reverse the Collector and Emitter leads. Do not press the Test Button. If the Conduction LED lights the IGBT has a built in protection diode. This is a normal test condition for this type of device. If the Conduction LED does not light then the IGBT does not have a built in protection diode. This is also a normal test condition for this type of device.

It is important to note that Functional test of the IGBT should always be performed when the device is out-of-circuit. In other words, it should be removed from the product and have no other electrical connections in place, other than those outlined in the Test procedure.

IGBT Test Procedures

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Solderless Electrical Terminal Assortment - 160 Pc

!±8± Solderless Electrical Terminal Assortment - 160 Pc

Brand : IIT | Rate : | Price : $0.00
Post Date : Dec 20, 2011 00:12:07 | Usually ships in 1-2 business days

Solderless Electrical Terminal Assortment - 160 Pc

Set includes: 10-12ga: ring terminals 55-5 4pc, 55-8 4pc, 55-10 4pc, male connect 5pc, female disconnect 5pc, butt connector 12pc. 16-14ga: ring terminals 2-6 10pc, 2-5L 10pc, 2-4L 10pc, bullet male connect & female disconnect 10pc each, spade terminal 2-4M 10pc. 18-14ga: butt connector 18pc, quick splice 4pc. 22-18ga: ring terminal 1.25-4 8pc, quick splice 4pc, butt connector 12pc. Includes handy re-sealable organized-by-size see-through case.****

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