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Common connector types for NVH test systems

Time:2019-09-28

In the NVH test process, the most basic information is the sensor data, including noise, vibration, speed, speed, temperature and other signals. With these signals, you can further understand the state of the test object and analyze the meaning of these signals in depth. All signals must be transmitted to the data acquisition analysis system through various interfaces. Re-precise systems rely on these secure and stable connectors to collect information, transmit information, and support information exchange and analysis throughout the system.


The data connector is the interface used when transmitting signals. Different types of signals often have different types of connectors. With the development of science and technology, new technologies are constantly appearing and updating, and the types of joints are constantly developing and increasing. If you don't understand the basics of these connectors, it will inevitably cause various problems in the process of use. Small to signal interference, invalid data, large accidents, endangering equipment and life safety.


First, a concept is explained. An interface (interface) refers to the physical characteristics and standards of the connection between hardware, including the frequency, strength, type, number, etc. of the transmitted signal. A connector (connector) refers to a specific physical form of an interface and is a device that implements circuit interconnection. However, generally, when used daily, it is not carefully separated and aligned. The connector is divided into male and female, which are conventionally integrated. The plug is a male (male connector, plug), and the socket is a female (female, jack).



BNC connector


The most common connector in the NVH test, called Bayonet Neill–Concelman, is a connector for connectors for coaxial cables. The joint name is derived from its inventor, Paul Neill and Carl Concelman of Bell Labs. The translation is a snap-on installation, so when installing, insert the connector into the end and then rotate it to secure the bayonet. Mainly divided into 50Ω and 75Ω, the dimensions are basically the same.



From left to right: 75Ω female, 75Ω male, 50Ω female, 50Ω male



LabV6 6-channel BNC interface


The BNC connector can only transmit one signal, the middle metal pin is used for signal transmission, and the outer edge is ground. The cable used together is a coaxial cable. That is, the middle is the signal line, and the surrounding includes the insulating layer and the mesh grounding wire. The signal generally concerned by the NVH test is basically the varying AC amount, and the mesh metal wire of the cable can well reduce the energy radiation and improve the efficiency of signal transmission. . The conventional number adopts one channel and one signal, so the BNC interface is very suitable, and the interface is firm and safe, and the application is wide. Analog and digital signals, audio and video transmission, etc. can be applied. However, the size of the BNC connector is large, so the channel density of the digital mining equipment is not high.



Coaxial cable



SMA connector


Ultra-small version A is also very common, such as GPS antennas. The SMA is in the form of a thread and has only one signal line for use with a coaxial cable. This connector is commonly used in various industries for various signal antennas, radios, wireless antennas, and the like. In the NVH industry, it is mainly the interface for receiving GPS signals.


SMB connector


SubMiniature version B, similar to the SMA connector, but smaller in size, not in the form of a thread, is fixed by the spring piece design of the plug, and can be directly inserted and removed. The number is often used for the screw pulse interface. The male and female connectors of the SMB connector are designed to be different from the SMA. It is easy to mix. The socket (jack) of the SMB is a signal pin, which is a male connector, and the plug (plug) is a tubular connector cap, which is a female connector.


10-32 (attached particles) connector


Common in sensors, its shape is close to SMA. It is also a fixed form of thread, most commonly used for accelerometers, small microphones and other types of sensors. Pay attention when using it. First, insert the male and female ends into a tight position, then rotate the outer casing of the male head to make the thread fixed. You must not rotate the female or cable.




From left to right: 10-32 male, 10-32 female



TRS (tip, ring, sleeve) audio connector


Devices such as headphones are the most common and used when playing back sounds. The connector can transmit two channels of data at the same time, wherein the prompt contact and the ring contact transmit two signals, the sleeve contact is a common ground wire. The TRS joint is cylindrical, and the contacts are separated by an insulating material, usually have three sizes. , 3.5mm for 6.3mm and 2.5mm.


Due to its small size, the 2.5mm connector is generally used in portable thin and light equipment. The 3.5mm connector is commonly used in computers and household equipment. It is the most common connector. The 6.3mm connector is bulky, the contact area of the contact is large, and the signal-to-noise ratio is large. Good, safer and more durable, generally used in professional equipment. In use, the prompt contact corresponds to the left channel, and the ring contact corresponds to the right channel.

XLR (Cannon XLR) Canon connector


The original product was a Cannon X-series connector, which was later improved with the addition of a latch to increase the robustness of the plug. The product was renamed Cannon XL. Further, around the joint, a rubber sealant (rubber compound) has been added, now called XLR joint or Canon joint.


Thanks to the bolt locking device, the XLR connector is very strong and is often used on equipment that requires high signal quality or is susceptible to vibration, such as electric guitars and microphones. In addition, the XLR connector not only transmits analog signals, but also applies to the transmission of digital signals.


Our common XLR connector is 3 pins, but the XLR connector can also be 2, 4, 5, 6 and so on. The bottom left picture shows the 3-pin connector, XLR3.


Remo (LEMO) connector


Plug-in self-locking joints invented by LEMO. Thanks to the patented plug-in self-locking technology, the company can provide a variety of models, different sizes, different pin connectors. Because it is easy to use, safe and secure, it can be used in a variety of signal types and is now widely used on NVH devices.


The LMEO plug has no thread and can be directly inserted and removed. It should be noted that the plug has a self-locking function and is automatically locked after being inserted into the bottom. If you want to pull out the plug, you must pinch a specific part of the plug (the outer wall grooved part) to pull it out. In addition, most models have locating pins that prevent misoperation, so when installing, the plug and socket locating pins must be aligned (red dots to red dots) before they can be inserted.


d-SUB connector


The gun company (the same company as Canon) was invented in 1952. The full name is d-ultra-small. Because the shape of the joint is named like the capital letter d, it has a wide range of applications in various industries. The D-sub-joint consists of two rows. Or more than one pin, you can define multiple signals. Due to the relatively high density of the stitches, there are many options for the size. When the channel density needs to be increased, the DA-15 is often referred to as the d-sub connector. The model size is A and 15 pin connectors.


The d-sub-joint is fixed by two bolts or buckles on the side. When using it, you need to see the corresponding relationship between the shape of the plug and the socket d, and do not insert it. After inserting it completely, tighten the bolts to ensure the safety and stability of data transmission.


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