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Appendix D
153
Caring for Connectors
Mechanical Specifications
Mechanical Specifications
The critical dimension to be measured, regardless of connector type, is the position
(generally, the recession or setback) of the center conductor relative to the outer
conductor mating plane.
Mechanical specifications for connectors specify a maximum distance and a
minimum distance that the center conductor can be positioned behind (or, in female
Type-N connectors, in front of) the outer conductor mating plane. Nominal
specifications for each connector type exist, but the allowable tolerances (and
sometimes the dimensions themselves) differ from manufacturer to manufacturer
and from device to device. Therefore, before gaging any connector, consult the
mechanical specifications provided with the connector or the device itself.
Precision 7mm Connectors
In precision 7mm connectors, contact between the center conductors is made by
spring-loaded contacts called collets. These protrude slightly in front of the outer
conductor mating plane when the connectors are apart. When the connection is
tightened, the collets are compressed into the same plane as the outer conductors.
For this reason, two mechanical specifications are generally given for precision
7mm connectors: the maximum recession of the center conductor behind the outer
conductor mating plane with the center conductor collet removed; and a minimum
and maximum allowable protrusion of the center conductor collet in front of the
outer conductor mating plane with the collet in place.
The center conductor collet should also spring back immediately when pressed with
a blunt plastic rod or with the rounded plastic handle of the collet removing tool.
Never use a pencil or your finger for this purpose.
With the center conductor collet removed, no protrusion of the center conductor in
front of the outer conductor mating plane is allowable, and sometimes a minimum
recession is required. Consult the mechanical specifications provided with the
connector or the device itself.
Sexed Connectors
In Type-N and precision 3.5mm connectors, the position of the center conductor in
the male connector is defined as the position of the shoulder of the male contact pin
Содержание NFA Series
Страница 25: ...13 2 Test Descriptions This chapter descibes each test required for calibration and performance verification...
Страница 114: ...104 Chapter3 Technical Specifications General Specifications...
Страница 126: ...116 AppendixA Model N8973A Test Records Measurement Jitter Test Record...
Страница 138: ...128 AppendixB Model N8974A Test Records Measurement Jitter Test Record...
Страница 152: ...142 AppendixC Model N8975A Test Records Measurement Jitter Test Record...
Страница 178: ...168 AppendixD Caring for Connectors Principles of Microwave Connector Care...
Страница 184: ...174 Index Index...