Keysight Technologies N4000A SNS Series Operating And Service Manual

Contents

A Caring for Connectors68 Keysight N4000/1/2A Operating and Service ManualMechanical SpecificationsThe critical dimension to be measured, regardless of connector type, is theposition (generally, the recession or setback) of the center conductor relative tothe outer conductor mating plane.Mechanical specifications for connectors specify a maximum distance and aminimum distance that the center conductor can be positioned behind (or, infemale Type-N connectors, in front of) the outer conductor mating plane. Nominalspecifications for each connector type exist, but the allowable tolerances (andsometimes the dimensions themselves) differ from manufacturer to manufacturerand from device to device. Therefore, before gaging any connector, consult themechanical specifications provided with the connector or the device itself.Precision 7 mm connectorsIn precision 7 mm connectors, contact between the center conductors is made byspring-loaded contacts called collets. These protrude slightly in front of the outerconductor mating plane when the connectors are apart. When the connection istightened, the collets are compressed into the same plane as the outerconductors.For this reason, two mechanical specifications are generally given for precision7 mm connectors — the maximum recession of the center conductor behind theouter conductor mating plane with the center conductor collet removed; and aminimum and maximum allowable protrusion of the center conductor collet infront of the outer conductor mating plane with the collet in place.The center conductor collet should also spring back immediately when pressedwith a blunt plastic rod or with the rounded plastic handle of the collet removingtool. Never use a pencil or your finger for this purpose.With the center conductor collet removed, no protrusion of the center conductorin front of the outer conductor mating plane is allowable, and sometimes aminimum recession is required. Consult the mechanical specifications providedwith the connector or the device itself.