Mechanical Inspection: Connector Gages - Keysight NFA Series Performance Verification And Calibration Manual

Table E-1 Recommended connector gages

Mechanical Inspection: Connector Gages

Even a perfectly clean, unused connector can cause problems if it is
mechanically out of specification. Since the critical tolerances in
microwave connectors are on the order of a few ten-thousandths of an
inch, using a connector gage is essential.
Before using any connector for the first time, inspect it mechanically
using a connector gage. How often connectors should be gaged after that
depends upon usage.
In general, connectors should be gaged whenever visual inspection or
electrical performance suggests that the connector interface may be out
of specification, for example due to wear or damage. Connectors on
calibration and verification devices should also be gaged whenever they
have been used by someone else or on another system or piece of
equipment.
Precision 3.5mm and SMA connectors should be gaged relatively more
often than other connectors, owing to the ease with which the center pins
can be pulled out of specification during disconnection.
Connectors should also be gaged as a matter of routine - after every 100
connections and disconnections initially, more or less often after that as
experience suggests.
Connector gage kits containing all of the items required are included in many
Agilent calibration kits. They are also available separately. Part numbers are as
follows.
Type
Precision 7mm
(APC-7)
Precision 3.5mm
Precision 2.4mm
Type-N
Appendix E
Mechanical Inspection: Connector Gages
Part Number/Ordering Information
85050-80012
11752D
11752E
85054-60047
Caring for Connectors
165