BS IEC 60313-2002 pdf – Coaxial connectors used in nuclear laboratory instrumentation.
1 Scope and object This International Standard applies to coaxial connectors for electrical instruments used in nuclear laboratories. While particularly useful in such applications, the connectors included in this standard are also useful in other applications. However, this standard does not necessarily apply to nuclear power installations where special requirements may necessitate the use of other connectors, some of which (e.g. types N and TNC) are described in various parts of IEC 601 69. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 601 69-8:1 978, Radio-frequency connectors – Part 8: R.F. coaxial connectors with inner diameter of outer conductor 6,5 mm (0,256 in) with bayonet lock – Characteristic impedance 50 ohms (type BNC) Amendment 1 (1 996) Amendment 2 (1 997) IEC 601 69-1 0:1 983, Radio-frequency connectors – Part 10: R.F. coaxial connectors with inner diameter of outer conductor 3 mm (0,12 in) with snap-on coupling – Characteristic impedance 50 ohms (type SMB) Amendment 1 (1 986) Amendment 2 (1 996) IEC 60498:1 975, High-voltage coaxial connectors used in nuclear instrumentation IEC 60729:1 982, Multiple controllers in a CAMAC crate 3 Recommended connectors To comply with this standard, nuclear laboratory instruments shall use the connectors listed below for nuclear signal applications. 3.1 Connectors for peak voltages not exceeding 500 V For applications in nuclear laboratory instruments, the following connectors should be used for peak voltages not exceeding 500 V: a) type BNC as defined in IEC 601 69-8; b) type 50CM as defined in IEC 60729; c) type SMB as defined in IEC 601 69-1 0.
3.2 High-voltage connector For applications up to 5 kV, type B connectors, as defined in IEC 60498, should be used. These connectors are often termed type SHV connectors (Safe High Voltage). See also 4.3. 4 Descriptions 4.1 BNC connector The BNC connector (3.1 a)) is a medium size connector that has been in use for a long period of time and continues to be used in a wide variety of applications and disciplines. 4.2 50CM and SMB connectors The type 50CM (3.1 b)) (commonly referred to as the LEMO connector) is a miniature connector with a positive securing mechanism while the type SMB (3.1 c)) is a subminiature snap-on connector. As technology advanced, particularly with the advent of solid-state circuitry, instrument panel space became both scarce and crowded while the number of input and output connectors continued to increase. Thus, the miniature type 50CM connector (3.1 b)) and the subminiature type SMB connector (3.1 c)) came into common use on NIM (see [1 ] 1 ), CAMAC (see IEC 60729 and ) and Fastbus (see ) instruments as well as in numerous other applications, both in nuclear instrumentation and in many other areas. 4.3 High-voltage connector The high-voltage connector (3.2) is commonly known as type SHV (Safe High Voltage) connector. It is a small connector in which the pin and socket contacts are recessed within the con- nector housing and surrounded by insulating sleeves so as to minimize the possibility of the user accidentally coming into contact with high voltage when the connector pair is not mated.