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Radio Frequency Interference (RFI) and Electro Magnetic Interference (EMI) are two very important considerations in any electronic system. They are especially common in contact points in electrical and electronic systems, such as contacts, fingerstock, and gaskets. It is essential to understand RFI and EMI in order to effectively design and build a reliable and safe system.

RFI is caused by an electrical or radio transmission interfering with an electrical system or equipment. It can be caused by external sources, such as a radio or television station, or an internal source, such as an improperly installed electrical component. It can also be caused by a defect or improper shielding of an electrical system. RFI can interfere with the proper operation of electronics in several ways, such as causing signal distortion, false triggering, or complete system failure.

EMI is caused by the radiation of electromagnetic waves, which can interfere with sensitive electronics. It is caused by a variety of sources, such as computer monitors, electrical motors, and electric lighting. It can also be caused by wireless systems operating in close proximity to other electronic systems. EMI can also interfere with the proper operation of electronics in several ways, such as causing signal distortion, false triggering, or complete system failure.

In order to prevent RFI and EMI from affecting an electrical system, contact points need to be designed and manufactured to minimize interference. These contact points come in various shapes, sizes, and materials, depending on the application. One of the most common types of contacts used in electronic systems are fingerstock gaskets. Fingerstock gaskets are designed to shield the contacts from any RFI or EMI that may be present in the surrounding environment.

Fingerstock gaskets are usually made from a variety of materials, including rubber, copper foil, and plastic. The design of the gasket will depend on the type of contact and the application. For example, if the contact is to be used in a high voltage application, the gasket material will usually have to be able to withstand the higher voltages. The gasket\'s design and material will also depend on the amount of RFI and EMI shielding required.

The most common form of contact is the fingerstock gasket, which consists of an inner and outer contact. The inner contact is a conductive material, usually made of a silver alloy. This material is designed to provide a conductive path for signals between the source and the destination. The outer contact is also made of a conductive material, usually made of a copper alloy. This material is designed to provide a ground connection, which helps to reduce RFI and EMI noise.

In order to ensure that the contacts are properly shielded, the contact system should be designed with a shielding layer. This can be done by using an aqueous film forming foam (AFFF). The AFFF will form an surface that will help to minimize interference by reflecting any signals away from the contacts. If the contacts are exposed to an open area, then shielding may not be needed.

When it comes to designing and building contact systems, it is important to understand the principles of both RFI and EMI. By using the right materials and following the proper design principles, one can create a reliable and safe contact system that will provide the necessary electrical connections. With the help of a qualified engineer, contact systems can be designed and implemented in order to provide reliable and safe operation for any electronic system.

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