Progress Report of the IEEE Instrumentation and Measurement Group Technical Subcommittee on Precision Coaxial Connectors

The accuracy of RF and microwave measurements made in coaxial systems is often limited at higher frequencies by the mismatch errors from the connectors. The need for higher accuracies in coaxial impedance measurements and for improved coaxial transfer standards of attenuation and power has led to several independent designs of coaxial precision connectors within the United States and abroad. The Committee is in the process of establishing "recommended practices" to standardize definitions, testing procedures, and mechanical and electrical characteristics for precision connectors. The Recommended Practicesfor Precision Coaxial Connectors is divided into four parts. Part I describes "General Requirements and Definitions" for Laboratory Precision Connectors (LPC), General Precision Connectors (GPC), and mechanical and electrical properties. Part II describes "Parameters to be Specified" for environmental conditions and mechanical and electrical characteristics. Parts I and II were completed and approved by the Subcommittee and the Parent Committee in 1963. A draft of Part III concerning "Parameter Limits" for coaxial line sizes, axial and angular forces, critical dimensions and tolerances for mating surfaces, VSWR limits, insertion loss, leakage, contact resistance, and other characterstics has been completed. Part IV concerning "Test Procedures" is now being processed. In March, 1964, Parts III and IV will be presented to the Subcommittee for approval. When all four parts of the Recommended Practices for Precision Coaxial Connectors are approved, this document will then be submitted to the American Standards Association for consideration as a standard.