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Triaxial Connector, full name Triaxial Connector.Tri-coaxial, literally, is three cylinders coaxial.Tri-coaxial connector, different from common two-core connector, can connect signal, grounding and shielding layer at the same time, shielding effect is good.In appearance, the triaxial connector is provided with a center contact and a middle cylindrical contact.The connection of three coaxial connectors generally adopts bayonet connection (TRB series) and thread connection (TRT series), in addition to ultra-small TRS connector, STRB connector and STRT connector series.The bayonet connection for three common coaxial BNC connectors, in two bayonet (2 ears), on the basis of three pin socket using the ear (3) connection structure, matching plug connected by three spiral groove (3) structure, the structure connection is convenient, reliable, stable electrical performance, quick plug, the connection is better than traditional BNC2 ear connectors,Can withstand severe shock and vibration.Triaxial BNC connectors are primarily used in sensitive electronic measuring systems. They do not match directly with ordinary BNC connectors, but can be connected to ordinary BNC connectors through adapters (or adapters).

In China, the SJ 51212/4-1994 specification for triaxial RF connectors was issued in 1994, which specifies the detailed requirements of the TRB series (cable) jack contacts for the 2-level RF triaxial plug connectors.TRB series 2 RF triaxial connectors are suitable for radio equipment and electronic instruments in radio circuit, connecting RF triaxial cables, having bayonet connection structure, RF applications requiring higher shielding performance, etc.

At present, the data bus with rf three coaxial connector has been widely used in surface ship, aviation and many business, such as remote sensing, radar, satellite signal transmission, data networks, airports, armor and surrounding alert authorities occasions, also a large number of applications in digital data lines, video, baseband circuit and other senior no noise protection circuit.Because of their ability to improve the transmission capacity and anti-interference capability of data transmission systems, tricoaxial cables and connectors are widely used for transmission and measurement of weak signals such as low thermal potential EMF and signals with high shielding requirements.

Triaxial connectors are used to transmit radio frequency signals over a wide range of frequencies up to 50GHz or higher, primarily for radar, communications, data transmission, and aerospace equipment.The basic structure of a coaxial connector consists of a central conductor, a dielectric material (or insulator), and an outer conductor (which acts as the outer shield of a coaxial cable).

Usually there are three levels of product for each type of connector, providing the right connector for each type with both cost and performance in mind.Some special connectors (connectors) may not be available in all three levels of product.
1, measurement level
Standard parts for calibration
Slotless connection design for highest performance
Minimum tolerance
Air medium
Long life
High production cost
Of all the classes of connectors, the metered-grade connectors provide the best performance and also the highest cost.It is generally used for calibration standard parts, performance verification standard parts and some applications requiring precision connection.Connectors of this class are the most accurate in size, have the lowest tolerances, and can withstand multiple and repeated connections, so they also have the longest service life of any class.

Metering grade connectors are closest in terms of material and size.To provide the highest level of performance and traceability, meter-grade connectors use an air medium interface and a slotless female head connection.
While metered-grade connectors are very repeatable and provide good accuracy after multiple uses, this is not to say that metered-grade connectors are robust and do not require great care when used.On the contrary, since the tools and manufacturing processes used in the production of this class of connectors are of the highest precision, the use of connectors of lower grades and the metering class of connectors match, dust and other small debris, will make a high-precision measurement ineffective, and may damage the metering class of connectors.
Note: Do not use the connectors of the metering standard parts (metering grade) to the production grade connectors.

2. Instrument level
It is used in the output/input interface of the instrument and some economical calibration parts
Good performance
Small tolerances
Support non-conducting medium interface
Long service life
Instrument - grade connections are generally considered "intermediate - grade" connections.This class of connectors is mainly used in the inside of the instrument and the instrument connectors, some economic calibration parts will also use this class of connectors.It provides better test performance and smaller tolerances.Compared with metering level connectors, because some instrument level connectors may use a non-conducting medium interface, it may not be a perfect match with metering level connectors.
Note: although technically called instrument grade, some test connectors on instruments use very precise connectors (very close to metering grade), so try to add the appropriate connector to the test port of the instrument during use.

3. Production level
It's used in products
Low performance
Tolerance is big
Support non-conducting medium interface
Limited number of connections
The cost is low
This is the lowest class of connectors, usually used for testing products, and the performance of this class of connectors is also the worst of all classes due to the large tolerances.Every time you use this class of connectors to connect to the instrument, you need to check the connectors carefully.Do not use production-grade connectors to connect your meter-grade connectors.Production-grade connectors cost less and have shorter life spans.If the joint grade of the part under test is relatively low, please use the appropriate connector to protect the joint of the instrument when connecting the instrument.
The size of the outer conductor of the connector is different to prevent the mixed use of incompatible joints.Table to see which connectors are compatible.
However, in the course of daily use, wear, lack of cleaning, wrong connection methods, bad storage methods can cause damage to the connector.Using a broken or defective connector can cause damage to the connector that matches it, so clean and inspect all connectors before using them.
In addition, not all connectors have three levels. When different connectors are used in matching, production level connectors may cause harm to metering level connectors. Use appropriate connectors to transition according to the level of connectors.