Agilent Technologies 8510-58 manual Appendix B Dimensional considerations in coaxial connectors

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Appendix B

Dimensional considerations in coaxial connectors

This appendix describes dimensional considera- tions and required conventions used in determin- ing the physical offset length of calibration standards in sexed coaxial connector families.

Precise measurement of the physical offset length is required to determine the OFFSET DELAY of a given calibration standard. The physical offset length of one and two port standards is as follows.

One port standard–Distance between “calibration plane” and terminating impedance.

Two port standard–Distance between the Port 1 and Port 2 “calibration planes.”

The definition (location) of the “calibration plane” in a calibration standard is dependent on the geometry and sex of the connector type. The “cali- bration plane” is defined as a plane which is per- pendicular to the axis of the conductor coincident with the outer conductor mating surface. This mat- ing surface is located at the contact points of the outer conductors of the test port and the calibra- tion standard.

To illustrate this, consider the following connector type interfaces:

7-mm coaxial connector interface

The “calibration plane” is located coincident to both the inner and outer conductor mating sur- faces as shown. Unique to this connector type is the fact that the inner and outer conductor mating surfaces are located coincident as well as having hermaphroditic (sexless) connectors. In all other coaxial connector families this is not the case.

3.5-mm coaxial connector interface

The location of the “calibration plane” in 3.5-mm standards, both sexes, is located at the outer con- ductor mating surface as shown.

Type-N coaxial connector interface

The location of the “calibration plane” in Type-N standards is the outer conductor mating surfaces as shown below.

Note

During measurement calibration using the Agilent 85054 Type-N Calibration Kit, standard labels for the “opens” and “shorts” indicate both the stan- dard type and the sex of the calibration test port. The sex (M or F) indicates the sex of the test port, NOT the sex of the standard. The calibration plane in other coaxial types should be defined at one of the conductor interfaces to provide an easily veri- fied reference for physical length measurements.

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Contents Product Note 8510-5B Table of contents Measurement calibration Measurement errorsIntroduction Calibration kit Standard definition Class assignmentStandard definitions table Standard class assignments Modification procedure Select standardsDefine standards Standard definition modelsOpen circuit capacitance C0 , C1 , C2 and C3 Standard numberStandard type ΠfX ΠfZ∆∅radians = 2πf ∆length Short circuit inductance L0 , L1, L2 and L3Fixed or sliding Offset delayDelay seconds = Terminal impedanceLinear delay Actual delay = Fco/f2 Offset Z01GHz c Z0 Offset loss1GHz = 10 log10e εrLower/minimum frequency Coax or waveguide Upper/maximum frequencyFupper = 2 x Flower ∅radians =Standard Classes Assign classesStandard labels Reverse transmission match and thru S11 A,B,C and S22 A,B,CForward transmission match and thru IsolationTRL Line TRL ThruTRL Reflect TRM ThruCalibration kit label Standard Class labelsTRL options Enter standards/classes Verify performanceModeling a thru adapter User modified cal kits and Agilent 8510 specificationsModification examples Modeling an arbitrary impedance standardTo load calibration kits from disk into Agilent Appendix a Calibration kit entry procedureDisk procedure To store calibration kits from the Agilent 8510 onto a diskFront panel procedure P-band waveguide example Pshort Type-N coaxial connector interface Appendix B Dimensional considerations in coaxial connectorsMm coaxial connector interface Mm Coaxial connector Type-N coaxial connector interface Female type-NPage Appendix C Cal coefficients model EquationTheir first order approximations, R is small and G=0, are Then Online assistance Phone or Fax United States
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