In this article, we will explain the structure, type, conversion, etc. of BNC connectors.
What is a BNC connector?
BNC (Bayonet N Connector) is a cable connector often used in electronic measurement.
B means Bayonet type structure, N means N type, and C means connector.
The last C is the C of the connector.
Due to its small size and relatively good frequency characteristics, it is often used for measurement, communication, video signals, etc.
BNC connector structure
The BNC connector has a structure (bayonet type) that can be fixed by pushing and turning a spring without using screws.
Therefore, there is an advantage that it can be easily attached and detached with one behavior.
On the other hand, the BNC connector is not suitable for thick coaxial cables.
The thickness of the compatible coaxial cable is 1.5D to 5D.
BNC connector type
For measurement and communication, the one with a characteristic impedance of 50Ω is standard.
For video signals, 75Ω is used and the diameter of the contact pin is smaller than that of 50Ω.
It seems that the applicable frequency is generally up to 4GHz.
It should be noted that 50Ω and 75Ω BNCs are different and cannot be mechanically interconnected.
BNC electrical characteristics and mechanical dimensions are defined by JIS and MIL standards. (JIS C 5412, etc.)
However, in the case of measuring instruments for low frequency applications, it is often adopted because it is small and convenient, and it is wrong to judge that it is a 50Ω circuit because BNC is used.
