What is the contact resistance?
contact resistance is often measured to determine the status, circuit or other types of cable connections. This type of resistance usually describes the flow of electricity or heat from one place to another, usually dependent on the shape of contact surfaces and layers used for insulation. Parts with larger surface surfaces usually have low contact resistance, while parts with relatively smaller surfaces tend to have a higher resistance. Gold and other soft metals usually have a higher surface of the surface area, so they are often used in contact pads.
When the two ingredients are in contact with each other, the flow of electricity and even heat in the form of resistance of thermal contact is often influenced by a microscopic phenomenon in the material. For example, some metal areas are in direct contact and are fully conductive, while other areas may have higher resistance and only partially. Non -conductive regions are sometimes present as possible.
Electric contact resistance can be increased if the connection between two plates or surface and probe is not sufficiently tight. If the joints need to be joined, the lines of tension may also affect, while the erosion of contacts or their surfaces is often the cause of high contact resistance. Contamination with dirt or other compounds may also be a factor. Contacts on cables of jumpers often corrode, preventing electricity preventing one car battery and the other. Fuse contact corrosion can also affect the performance of the device.
If there is a high level of current flowing through the device and the contact resistance is high enough, the heat can accumulate and represent additional risks. A test device such as an ohmmeter can be used to determine the level of contact resistance in conjunction. When performing this type of testing, you must frequently create a metal surface of the contact surface and whether the connection is soldered, stared, screwed or welded. UsuallyIt is considering the pressure at which the contact is held together.
Normal contact resistance is usually identified by manufacturers of the tested device. Proper measurement ranges are often described in the product manuals or sometimes marked directly on devices. Measurement of contact resistance is generally important for monitoring the status of power transmission lines. Sometimes it is also carried out to characterize the pressure of fluids, which can behave similarly to the electrical voltage between different flow channels.